My prototype reduces power when playing https://www.youtube.com/watch?v=cU-nK4V5idY in 1080p60 with hardware accelerated video disabled from around 4 W to around 3.1W, partly through a reduction in GPU power from 0.37W to 0.09W and partly by doing less work on the CPU with all the GL commands.

Nice! That's way more savings then I was ever able to see with zero-copy.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/d817ddec78c9de78881a1661fa7f03e077d32d36

commit d817ddec78c9de78881a1661fa7f03e077d32d36
Author: jbauman <jbauman@chromium.org>
Date: Thu May 04 21:05:05 2017

Allow binding multiple textures to one DC Layer overlay.

Modify ScheduleDCLayers command to take an array of textures.  This will
allow using NV12 shared-memory GpuMemoryBuffers, which will have
separate Y and UV GLImages.

BUG= 716286 
CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel

Review-Url: https://codereview.chromium.org/2849743002
Cr-Commit-Position: refs/heads/master@{#469468}

[modify] https://crrev.com/d817ddec78c9de78881a1661fa7f03e077d32d36/cc/output/gl_renderer.cc
[modify] https://crrev.com/d817ddec78c9de78881a1661fa7f03e077d32d36/gpu/command_buffer/build_gles2_cmd_buffer.py
[modify] https://crrev.com/d817ddec78c9de78881a1661fa7f03e077d32d36/gpu/command_buffer/client/gles2_c_lib_autogen.h
[modify] https://crrev.com/d817ddec78c9de78881a1661fa7f03e077d32d36/gpu/command_buffer/client/gles2_cmd_helper_autogen.h
[modify] https://crrev.com/d817ddec78c9de78881a1661fa7f03e077d32d36/gpu/command_buffer/client/gles2_implementation.cc
[modify] https://crrev.com/d817ddec78c9de78881a1661fa7f03e077d32d36/gpu/command_buffer/client/gles2_implementation_autogen.h
[modify] https://crrev.com/d817ddec78c9de78881a1661fa7f03e077d32d36/gpu/command_buffer/client/gles2_interface_autogen.h
[modify] https://crrev.com/d817ddec78c9de78881a1661fa7f03e077d32d36/gpu/command_buffer/client/gles2_interface_stub_autogen.h
[modify] https://crrev.com/d817ddec78c9de78881a1661fa7f03e077d32d36/gpu/command_buffer/client/gles2_interface_stub_impl_autogen.h
[modify] https://crrev.com/d817ddec78c9de78881a1661fa7f03e077d32d36/gpu/command_buffer/client/gles2_trace_implementation_autogen.h
[modify] https://crrev.com/d817ddec78c9de78881a1661fa7f03e077d32d36/gpu/command_buffer/client/gles2_trace_implementation_impl_autogen.h
[modify] https://crrev.com/d817ddec78c9de78881a1661fa7f03e077d32d36/gpu/command_buffer/cmd_buffer_functions.txt
[modify] https://crrev.com/d817ddec78c9de78881a1661fa7f03e077d32d36/gpu/command_buffer/common/gles2_cmd_format_autogen.h
[modify] https://crrev.com/d817ddec78c9de78881a1661fa7f03e077d32d36/gpu/command_buffer/common/gles2_cmd_format_test_autogen.h
[modify] https://crrev.com/d817ddec78c9de78881a1661fa7f03e077d32d36/gpu/command_buffer/service/gles2_cmd_decoder.cc
[modify] https://crrev.com/d817ddec78c9de78881a1661fa7f03e077d32d36/gpu/command_buffer/service/gles2_cmd_decoder_passthrough_doer_prototypes.h
[modify] https://crrev.com/d817ddec78c9de78881a1661fa7f03e077d32d36/gpu/command_buffer/service/gles2_cmd_decoder_passthrough_doers.cc
[modify] https://crrev.com/d817ddec78c9de78881a1661fa7f03e077d32d36/gpu/command_buffer/service/gles2_cmd_decoder_passthrough_handlers.cc
[modify] https://crrev.com/d817ddec78c9de78881a1661fa7f03e077d32d36/gpu/ipc/service/direct_composition_surface_win.cc
[modify] https://crrev.com/d817ddec78c9de78881a1661fa7f03e077d32d36/gpu/ipc/service/direct_composition_surface_win_unittest.cc
[modify] https://crrev.com/d817ddec78c9de78881a1661fa7f03e077d32d36/ui/gl/dc_renderer_layer_params.cc
[modify] https://crrev.com/d817ddec78c9de78881a1661fa7f03e077d32d36/ui/gl/dc_renderer_layer_params.h

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/60b4d8b24e7096491e00b1745ec64129a5234e06

commit 60b4d8b24e7096491e00b1745ec64129a5234e06
Author: jbauman <jbauman@chromium.org>
Date: Fri May 05 01:07:16 2017

Allow putting NV12 software GMBs into overlays on windows

Copy the shared-memory NV12 GpuMemoryBuffer into an NV12 D3D11 dynamic
texture, which can be used as the source for the video processing that
goes to the backbuffer.

This still needs --enable-gpu-memory-buffer-video-frames to be enabled.
In my testing it reduces power on a 1080p60 VP9 video from 4W to 3.1W.

BUG= 716286 
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel

Review-Url: https://codereview.chromium.org/2849963003
Cr-Commit-Position: refs/heads/master@{#469558}

[modify] https://crrev.com/60b4d8b24e7096491e00b1745ec64129a5234e06/gpu/ipc/service/direct_composition_surface_win.cc
[modify] https://crrev.com/60b4d8b24e7096491e00b1745ec64129a5234e06/gpu/ipc/service/direct_composition_surface_win_unittest.cc
[modify] https://crrev.com/60b4d8b24e7096491e00b1745ec64129a5234e06/media/video/gpu_memory_buffer_video_frame_pool.cc
[modify] https://crrev.com/60b4d8b24e7096491e00b1745ec64129a5234e06/ui/gl/gl_image.h
[modify] https://crrev.com/60b4d8b24e7096491e00b1745ec64129a5234e06/ui/gl/gl_image_memory.cc
[modify] https://crrev.com/60b4d8b24e7096491e00b1745ec64129a5234e06/ui/gl/gl_image_memory.h

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/a0bb898bd0e15d717ce009d706b16ffd0b58c62d

commit a0bb898bd0e15d717ce009d706b16ffd0b58c62d
Author: jbauman <jbauman@chromium.org>
Date: Fri May 05 19:50:53 2017

Enable GpuMemoryBuffer video frames on systems that support overlays.

This allows the video frames to be drawn using overlays, saving power.

BUG= 716286 

Review-Url: https://codereview.chromium.org/2858293003
Cr-Commit-Position: refs/heads/master@{#469760}

[modify] https://crrev.com/a0bb898bd0e15d717ce009d706b16ffd0b58c62d/content/renderer/render_thread_impl.cc