UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.113 Safari/537.36

Example URL:
https://www.twitch.tv/videos/170291386

Steps to reproduce the problem:
1. Go to chrome://flags/#autoplay-policy, set policy to "User gesture is required for cross-origin iframes", and restart the browser.
2. Go to the given URL with an account that doesn't have Twitch Turbo and isn't subscribed to SplattercatGaming (or maybe view while not logged in).
3. Reload until there's an ad at the start of the video.

What is the expected behavior?
The ad plays normally and you continue on to the non-ad content.

What went wrong?
The first frame of the ad is displayed for about half a second before the video area goes black and nothing happens.

Did this work before? N/A 

Is it a problem with Flash or HTML5? HTML5

Does this work in other browsers? N/A

Chrome version: 60.0.3112.113  Channel: stable
OS Version: 
Flash Version: Shockwave Flash 26.0 r0

Contents of chrome://gpu: 
Graphics Feature Status
Canvas: Hardware accelerated
CheckerImaging: Disabled
Flash: Hardware accelerated
Flash Stage3D: Hardware accelerated
Flash Stage3D Baseline profile: Hardware accelerated
Compositing: Hardware accelerated
Multiple Raster Threads: Force enabled
Native GpuMemoryBuffers: Software only. Hardware acceleration disabled
Rasterization: Hardware accelerated
Video Decode: Hardware accelerated
Video Encode: Hardware accelerated
WebGL: Hardware accelerated
WebGL2: Hardware accelerated
Driver Bug Workarounds
adjust_src_dst_region_for_blitframebuffer
clear_uniforms_before_first_program_use
count_all_in_varyings_packing
decode_encode_srgb_for_generatemipmap
disable_framebuffer_cmaa
disable_post_sub_buffers_for_onscreen_surfaces
dont_remove_invariant_for_fragment_input
force_cube_map_positive_x_allocation
force_int_or_srgb_cube_texture_complete
init_texture_max_anisotropy
regenerate_struct_names
remove_invariant_and_centroid_for_essl3
scalarize_vec_and_mat_constructor_args
disable_software_to_accelerated_canvas_upgrade
Problems Detected
Clear uniforms before first program use on all platforms: 124764, 349137
Applied Workarounds: clear_uniforms_before_first_program_use
Mesa drivers in Linux handle varyings without static use incorrectly: 333885
Applied Workarounds: count_all_in_varyings_packing
Linux AMD drivers incorrectly return initial value of 1 for TEXTURE_MAX_ANISOTROPY: 348237
Applied Workarounds: init_texture_max_anisotropy
Always rewrite vec/mat constructors to be consistent: 398694
Applied Workarounds: scalarize_vec_and_mat_constructor_args
Linux AMD drivers handle struct scopes incorrectly: 403957
Applied Workarounds: regenerate_struct_names
Linux ATI drivers crash on binding incomplete cube map texture to FBO: 518889
Applied Workarounds: force_cube_map_positive_x_allocation
Limited enabling of Chromium GL_INTEL_framebuffer_CMAA: 535198
Applied Workarounds: disable_framebuffer_cmaa
Disable partial swaps on Mesa drivers (detected with GL_VERSION): 339493
Applied Workarounds: disable_post_sub_buffers_for_onscreen_surfaces
adjust src/dst region if blitting pixels outside read framebuffer on Linux AMD: 664740
Applied Workarounds: adjust_src_dst_region_for_blitframebuffer
AMD drivers in Linux require invariant qualifier to match between vertex and fragment shaders: 659326, 639760
Applied Workarounds: remove_invariant_and_centroid_for_essl3, dont_remove_invariant_for_fragment_input
Disable KHR_blend_equation_advanced until cc shaders are updated: 661715
Decode and Encode before generateMipmap for srgb format textures on Linux AMD: 634519
Applied Workarounds: decode_encode_srgb_for_generatemipmap
Software to Accelerated canvas update breaks Linux AMD: 710029
Applied Workarounds: disable_software_to_accelerated_canvas_upgrade
Force integer or srgb cube map texture complete on Linux AMD: 712117
Applied Workarounds: force_int_or_srgb_cube_texture_complete
Native GpuMemoryBuffers have been disabled, either via about:flags or command line.
Disabled Features: native_gpu_memory_buffers
Checker-imaging has been disabled via finch trial or the command line.
Disabled Features: checker_imaging
Version Information
Data exported	8/28/2017, 12:40:02 AM
Chrome version	Chrome/60.0.3112.113
Operating system	Linux 4.11.12-200.fc25.x86_64
Software rendering list version	0
Driver bug list version	10.94
ANGLE commit id	3e6a61fecba9
2D graphics backend	Skia/60 d1f2d15b36f6a6a9d199581b998a7ca924a1f1a8-
Command Line	/opt/google/chrome/google-chrome --disk-cache-size=2147483647 --enable-crash-reporter --password-store=kwallet --flag-switches-begin --allow-insecure-localhost --autoplay-policy=no-user-gesture-required --enable-browser-task-scheduler --disable-device-discovery-notifications --blink-settings=disallowFetchForDocWrittenScriptsInMainFrame=false --disable-distance-field-text --disable-offer-upload-credit-cards --enable-clear-browsing-data-counters --enable-color-correct-rendering --enable-devtools-experiments --enable-display-list-2d-canvas --enable-es3-apis --enable-experimental-canvas-features --enable-google-branded-context-menu --enable-gpu-rasterization --history-entry-requires-user-gesture --disable-input-ime-api --enable-md-policy-page --disable-offer-store-unmasked-wallet-cards --enable-offline-auto-reload-visible-only --enable-offline-auto-reload --disable-password-generation --enable-permission-action-reporting --disable-push-api-background-mode --enable-quic --enable-scroll-prediction --use-simple-cache-backend=on --enable-single-click-autofill --enable-site-settings --enable-spelling-feedback-field-trial --enable-suggestions-with-substring-match --enable-tab-audio-muting --enable-tcp-fastopen --enable-use-zoom-for-dsf=true --enable-webfonts-intervention-v2=disabled --enable-webgl-draft-extensions --enable-webrtc-srtp-aes-gcm --enable-webrtc-stun-origin --enable-zero-copy --gpu-rasterization-msaa-sample-count=4 --ignore-gpu-blacklist --enable-lcd-text --num-raster-threads=4 --show-autofill-type-predictions --show-cert-link --show-saved-copy=primary --enable-slimming-paint-invalidation --enable-smooth-scrolling --top-chrome-md=material --touch-events=disabled --v8-cache-options=code --v8-cache-strategies-for-cache-storage=normal --wallet-service-use-sandbox=0 --enable-features=AsmJsToWebAssembly,BackgroundVideoTrackOptimization,DisplayPersistenceToggleInPermissionPrompts,FeaturePolicy,FetchKeepaliveTimeoutSetting,FontCacheScaling,FramebustingNeedsSameOriginOrUserGesture,GenericSensor,HttpFormWarning,IdleTimeSpellChecking,MaterialDesignExtensions,NativeNotifications,NewAudioRenderingMixingStrategy,NewOmniboxAnswerTypes,NoStatePrefetch,OffMainThreadFetch,OmniboxDisplayTitleForCurrentUrl,OmniboxEntitySuggestions,OmniboxUIExperimentMaxAutocompleteMatches,OneGoogleBarOnLocalNtp,OriginTrials,PermissionsBlacklist,RunAllFlashInAllowMode,SafeSearchUrlReporting,ServiceWorkerNavigationPreload,SharedArrayBuffer,SpeculativeResourcePrefetching,TranslateLanguageByULP,UseGoogleLocalNtp,UseSuggestionsEvenIfFew,VibrateRequiresUserGesture,WebAssembly,WebAssemblyStreaming,WebPayments,WebRTC-H264WithOpenH264FFmpeg,ZeroSuggestRedirectToChrome,brotli-encoding,drop-sync-credential,fill-on-account-select,password-import-export,token-binding --disable-features=AutofillUpstreamRequestCvcIfMissing,GamepadExtensions,GuestViewCrossProcessFrames,LoadingWithMojo,LocationHardReload,MaterialDesignBookmarks,MaterialDesignSettings,MemoryAblation,MemoryCoordinator,OverlayScrollbar,PassiveDocumentEventListeners,PassiveEventListenersDueToFling,PauseBackgroundTabs,PointerEvent,PreferHtmlOverPlugins,ScrollAnchoring,V8NoTurbo,WebUSB,protect-sync-credential,top-document-isolation --flag-switches-end
Driver Information
Initialization time	87
In-process GPU	false
Passthrough Command Decoder	false
Supports overlays	false
Sandboxed	false
GPU0	VENDOR = 0x1002, DEVICE= 0x1313
Optimus	false
Optimus	false
AMD switchable	false
Driver vendor	Mesa
Driver version	17.0.5
Driver date	
Pixel shader version	4.50
Vertex shader version	4.50
Max. MSAA samples	8
Machine model name	
Machine model version	
GL_VENDOR	X.Org
GL_RENDERER	Gallium 0.4 on AMD KAVERI (DRM 2.49.0 / 4.11.12-200.fc25.x86_64, LLVM 3.9.1)
GL_VERSION	4.5 (Core Profile) Mesa 17.0.5
GL_EXTENSIONS	GL_AMD_conservative_depth GL_AMD_draw_buffers_blend GL_AMD_performance_monitor GL_AMD_pinned_memory GL_AMD_seamless_cubemap_per_texture GL_AMD_shader_stencil_export GL_AMD_shader_trinary_minmax GL_AMD_vertex_shader_layer GL_AMD_vertex_shader_viewport_index GL_ANGLE_texture_compression_dxt3 GL_ANGLE_texture_compression_dxt5 GL_ARB_ES2_compatibility GL_ARB_ES3_1_compatibility GL_ARB_ES3_2_compatibility GL_ARB_ES3_compatibility GL_ARB_arrays_of_arrays GL_ARB_base_instance GL_ARB_blend_func_extended GL_ARB_buffer_storage GL_ARB_clear_buffer_object GL_ARB_clear_texture GL_ARB_clip_control GL_ARB_color_buffer_float GL_ARB_compressed_texture_pixel_storage GL_ARB_compute_shader GL_ARB_compute_variable_group_size GL_ARB_conditional_render_inverted GL_ARB_conservative_depth GL_ARB_copy_buffer GL_ARB_copy_image GL_ARB_cull_distance GL_ARB_debug_output GL_ARB_depth_buffer_float GL_ARB_depth_clamp GL_ARB_derivative_control GL_ARB_direct_state_access GL_ARB_draw_buffers GL_ARB_draw_buffers_blend GL_ARB_draw_elements_base_vertex GL_ARB_draw_indirect GL_ARB_draw_instanced GL_ARB_enhanced_layouts GL_ARB_explicit_attrib_location GL_ARB_explicit_uniform_location GL_ARB_fragment_coord_conventions GL_ARB_fragment_layer_viewport GL_ARB_fragment_shader GL_ARB_framebuffer_no_attachments GL_ARB_framebuffer_object GL_ARB_framebuffer_sRGB GL_ARB_get_program_binary GL_ARB_get_texture_sub_image GL_ARB_gpu_shader5 GL_ARB_gpu_shader_fp64 GL_ARB_half_float_pixel GL_ARB_half_float_vertex GL_ARB_instanced_arrays GL_ARB_internalformat_query GL_ARB_internalformat_query2 GL_ARB_invalidate_subdata GL_ARB_map_buffer_alignment GL_ARB_map_buffer_range GL_ARB_multi_bind GL_ARB_multi_draw_indirect GL_ARB_occlusion_query2 GL_ARB_pipeline_statistics_query GL_ARB_pixel_buffer_object GL_ARB_point_sprite GL_ARB_program_interface_query GL_ARB_provoking_vertex GL_ARB_query_buffer_object GL_ARB_robust_buffer_access_behavior GL_ARB_robustness GL_ARB_sample_shading GL_ARB_sampler_objects GL_ARB_seamless_cube_map GL_ARB_seamless_cubemap_per_texture GL_ARB_separate_shader_objects GL_ARB_shader_atomic_counter_ops GL_ARB_shader_atomic_counters GL_ARB_shader_bit_encoding GL_ARB_shader_image_load_store GL_ARB_shader_image_size GL_ARB_shader_objects GL_ARB_shader_precision GL_ARB_shader_stencil_export GL_ARB_shader_storage_buffer_object GL_ARB_shader_subroutine GL_ARB_shader_texture_image_samples GL_ARB_shader_texture_lod GL_ARB_shading_language_420pack GL_ARB_shading_language_packing GL_ARB_stencil_texturing GL_ARB_sync GL_ARB_tessellation_shader GL_ARB_texture_barrier GL_ARB_texture_buffer_object GL_ARB_texture_buffer_object_rgb32 GL_ARB_texture_buffer_range GL_ARB_texture_compression_bptc GL_ARB_texture_compression_rgtc GL_ARB_texture_cube_map_array GL_ARB_texture_float GL_ARB_texture_gather GL_ARB_texture_mirror_clamp_to_edge GL_ARB_texture_multisample GL_ARB_texture_non_power_of_two GL_ARB_texture_query_levels GL_ARB_texture_query_lod GL_ARB_texture_rectangle GL_ARB_texture_rg GL_ARB_texture_rgb10_a2ui GL_ARB_texture_stencil8 GL_ARB_texture_storage GL_ARB_texture_storage_multisample GL_ARB_texture_swizzle GL_ARB_texture_view GL_ARB_timer_query GL_ARB_transform_feedback2 GL_ARB_transform_feedback3 GL_ARB_transform_feedback_instanced GL_ARB_uniform_buffer_object GL_ARB_vertex_array_bgra GL_ARB_vertex_array_object GL_ARB_vertex_attrib_64bit GL_ARB_vertex_attrib_binding GL_ARB_vertex_shader GL_ARB_vertex_type_10f_11f_11f_rev GL_ARB_vertex_type_2_10_10_10_rev GL_ARB_viewport_array GL_ATI_blend_equation_separate GL_ATI_meminfo GL_ATI_texture_float GL_ATI_texture_mirror_once GL_EXT_abgr GL_EXT_blend_equation_separate GL_EXT_depth_bounds_test GL_EXT_draw_buffers2 GL_EXT_draw_instanced GL_EXT_framebuffer_blit GL_EXT_framebuffer_multisample GL_EXT_framebuffer_multisample_blit_scaled GL_EXT_framebuffer_sRGB GL_EXT_packed_depth_stencil GL_EXT_packed_float GL_EXT_pixel_buffer_object GL_EXT_polygon_offset_clamp GL_EXT_provoking_vertex GL_EXT_shader_integer_mix GL_EXT_texture_array GL_EXT_texture_compression_dxt1 GL_EXT_texture_compression_rgtc GL_EXT_texture_compression_s3tc GL_EXT_texture_filter_anisotropic GL_EXT_texture_integer GL_EXT_texture_mirror_clamp GL_EXT_texture_sRGB GL_EXT_texture_sRGB_decode GL_EXT_texture_shared_exponent GL_EXT_texture_snorm GL_EXT_texture_swizzle GL_EXT_timer_query GL_EXT_transform_feedback GL_EXT_vertex_array_bgra GL_IBM_multimode_draw_arrays GL_KHR_context_flush_control GL_KHR_debug GL_KHR_robust_buffer_access_behavior GL_KHR_robustness GL_MESA_pack_invert GL_MESA_shader_integer_functions GL_MESA_texture_signed_rgba GL_NVX_gpu_memory_info GL_NV_conditional_render GL_NV_depth_clamp GL_NV_packed_depth_stencil GL_NV_texture_barrier GL_NV_vdpau_interop GL_OES_EGL_image GL_S3_s3tc
Disabled Extensions	GL_KHR_blend_equation_advanced GL_KHR_blend_equation_advanced_coherent
Window system binding vendor	SGI
Window system binding version	1.4
Window system binding extensions	GLX_ARB_create_context GLX_ARB_create_context_profile GLX_ARB_create_context_robustness GLX_ARB_fbconfig_float GLX_ARB_framebuffer_sRGB GLX_ARB_multisample GLX_EXT_create_context_es_profile GLX_EXT_create_context_es2_profile GLX_EXT_fbconfig_packed_float GLX_EXT_framebuffer_sRGB GLX_EXT_import_context GLX_EXT_libglvnd GLX_EXT_texture_from_pixmap GLX_EXT_visual_info GLX_EXT_visual_rating GLX_MESA_copy_sub_buffer GLX_OML_swap_method GLX_SGI_make_current_read GLX_SGI_swap_control GLX_SGIS_multisample GLX_SGIX_fbconfig GLX_SGIX_pbuffer GLX_SGIX_visual_select_group GLX_INTEL_swap_event
Window manager	KWin
XDG_CURRENT_DESKTOP	KDE
Compositing manager	Yes
Direct rendering	Yes
Reset notification strategy	0x8252
GPU process crash count	0
System visual ID	33
RGBA visual ID	112
Compositor Information
Tile Update Mode	Zero-copy
Partial Raster	Enabled
GpuMemoryBuffers Status
ATC	Software only
ATCIA	Software only
DXT1	Software only
DXT5	Software only
ETC1	Software only
R_8	Software only
RG_88	Software only
BGR_565	Software only
RGBA_4444	Software only
RGBX_8888	Software only
RGBA_8888	Software only
BGRX_8888	Software only
BGRA_8888	Software only
RGBA_F16	Software only
YVU_420	Software only
YUV_420_BIPLANAR	Software only
UYVY_422	Software only
Log Messages
[14803:14803:0827/135619.895105:ERROR:sandbox_linux.cc(344)] : InitializeSandbox() called with multiple threads in process gpu-process.
[14803:14803:0827/151029.214673:ERROR:sync_control_vsync_provider.cc(64)] : glXGetSyncValuesOML should not return TRUE with a media stream counter of 0.
[14803:14803:0827/214959.638541:ERROR:gles2_cmd_decoder.cc(17721)] : [.DisplayCompositor-0x2389fe077600]GL ERROR :GL_INVALID_OPERATION : glCreateAndConsumeTextureCHROMIUM: invalid mailbox name
[14803:14803:0827/214959.638605:ERROR:gles2_cmd_decoder.cc(9728)] : [.DisplayCompositor-0x2389fe077600]RENDER WARNING: texture bound to texture unit 0 is not renderable. It maybe non-power-of-2 and have incompatible texture filtering.
[14803:14803:0828/001037.488058:ERROR:gles2_cmd_decoder.cc(17721)] : [.DisplayCompositor-0x2389fe077600]GL ERROR :GL_INVALID_OPERATION : glCreateAndConsumeTextureCHROMIUM: invalid mailbox name
[14803:14803:0828/001037.488152:ERROR:gles2_cmd_decoder.cc(9728)] : [.DisplayCompositor-0x2389fe077600]RENDER WARNING: texture bound to texture unit 0 is not renderable. It maybe non-power-of-2 and have incompatible texture filtering.
[14803:14803:0828/001037.488226:ERROR:gles2_cmd_decoder.cc(17721)] : [.DisplayCompositor-0x2389fe077600]GL ERROR :GL_INVALID_OPERATION : glCreateAndConsumeTextureCHROMIUM: invalid mailbox name
[14803:14803:0828/001037.488336:ERROR:gles2_cmd_decoder.cc(9728)] : [.DisplayCompositor-0x2389fe077600]RENDER WARNING: texture bound to texture unit 0 is not renderable. It maybe non-power-of-2 and have incompatible texture filtering.