UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/604.3.5 (KHTML, like Gecko) Version/11.0.1 Safari/604.3.5

Steps to reproduce the problem:
1. Try to create a WebGL context with failIfMajorPerformanceCaveat: true

What is the expected behavior?

What went wrong?
Since for some reason users with AMD HD GPUs get SwitfShader instead of hardware acceleration. However I wasn't able to find a blacklist entry for such GPUs. Have I missed it or it's a regression?

Attached some info from out users. User 1 has Win7 and Yandex Browser 17.10, which corresponds to Chromium 61.0.3163.100. Interestingly, hw acceleration workd for him on Opera 49 (which is Cr 62 IIUC).

about:gpu from another user's Chrome:

Note: To properly save this page, select the "Webpage, Complete" option in the Save File dialog.
Graphics Feature Status
Canvas: Software only, hardware acceleration unavailable
CheckerImaging: Disabled
Flash: Software only, hardware acceleration unavailable
Flash Stage3D: Software only, hardware acceleration unavailable
Flash Stage3D Baseline profile: Software only, hardware acceleration unavailable
Compositing: Software only, hardware acceleration unavailable
Multiple Raster Threads: Enabled
Native GpuMemoryBuffers: Software only. Hardware acceleration disabled
Rasterization: Software only, hardware acceleration unavailable
Video Decode: Software only, hardware acceleration unavailable
Video Encode: Software only, hardware acceleration unavailable
WebGL: Hardware accelerated but at reduced performance
WebGL2: Unavailable
Problems Detected
GPU rasterization should only be enabled on NVIDIA and Intel DX11+, and AMD RX-R2 GPUs for now.:
(http://crbug.com/643850) 643850
Disabled Features: gpu_rasterization
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 05.12.2017, 18:47:18
Chrome version Chrome/62.0.3202.94
Operating system Windows NT 6.2.9200
Software rendering list version 13.13
Driver bug list version 10.30
ANGLE commit id 842c43ae67ba
2D graphics backend Skia/62 e74b41c6c84638d5a9ee6d254a715bcd9e17c603-
Command Line "C:\Program Files (x86)\Google\Chrome\Application\chrome.exe" --flag-switches-begin
--flag-switches-end
Driver Information
Initialization time 0
In-process GPU true
Passthrough Command Decoder false
Supports overlays false
Sandboxed false
GPU0 VENDOR = 0x1002, DEVICE= 0x6759
Optimus false
Optimus false
AMD switchable false
Desktop compositing Aero Glass
Diagonal Monitor Size of \\.\DISPLAY1 18.9"
Driver vendor Google Inc.
Driver version 3.3.0.2
Driver date 2017/04/07
Pixel shader version 3.0
Vertex shader version 3.0
Max. MSAA samples 4
Machine model name
Machine model version
GL_VENDOR Google Inc.
GL_RENDERER Google SwiftShader
GL_VERSION OpenGL ES 2.0 SwiftShader
GL_EXTENSIONS
Disabled Extensions
Window system binding vendor
Window system binding version
Window system binding extensions
Direct rendering Yes
Reset notification strategy 0x0000
GPU process crash count 0
Compositor Information
Tile Update Mode One-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
R_16 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
Diagnostics... loading ...
Log Messages
GpuProcessHostUIShim: The GPU process exited normally. Everything is okay.

Did this work before? N/A 

Does this work in other browsers? N/A

Chrome version: 62.0.3202.94, 61.0.3163.100  Channel: stable
OS Version: 7, 8
Flash Version:
 

Deleted: user1_about_gpu_Ya_Bro.pdf 153 KB

user1_about_gpu_Ya_Bro.pdf 153 KB Download

Deleted: user1_dxdiag.png 234 KB

	user1_dxdiag.png 234 KB View Download