Vp9 decoder mft support for AMD apu/gpu

gpu/command_buffer/service/gpu_preferences.h

Index: gpu/command_buffer/service/gpu_preferences.h
diff --git a/gpu/command_buffer/service/gpu_preferences.h b/gpu/command_buffer/service/gpu_preferences.h
index bb158f5fd5f2b5cc52b7aaaf22ea218bf54d371e..9d903b64a605a99463b93e201f959670e267faa9 100644
--- a/gpu/command_buffer/service/gpu_preferences.h
+++ b/gpu/command_buffer/service/gpu_preferences.h
@@ -22,6 +22,15 @@ struct GPU_EXPORT GpuPreferences {
 
   ~GpuPreferences();
 
+  // support for accelerated Vpx decoding for various vendors

[nasko, 2016/07/13 23:07:10]

nit: Start with capital letter and and with period.

+  // intended to be used as a bitfield
+  enum VpxDecodeVendors {
+    VPX_VENDOR_NONE = 0x00,
+    VPX_VENDOR_INTEL = 0x01,
+    VPX_VENDOR_AMD = 0x02,
+    VPX_VENDOR_MICROSOFT = 0x04,
+    VPX_VENDOR_ALL = 0xff,
+  };
   // ===================================
   // Settings from //content/public/common/content_switches.h
 
@@ -48,8 +57,10 @@ struct GPU_EXPORT GpuPreferences {
 #endif
 
 #if defined(OS_WIN)
-  // Enables experimental hardware acceleration for VP8/VP9 video decoding.
-  bool enable_accelerated_vpx_decode = false;
+  // Enables experimental hardware acceleration for VP8/VP9 video decoding
+  // bitmask - 0x1=Intel; 0x2=AMD; 0xff=all

[nasko, 2016/07/13 23:07:10]

Missing comment for Microsoft.

+
+  VpxDecodeVendors enable_accelerated_vpx_decode = VPX_VENDOR_NONE;
 
   // Enables support for avoiding copying DXGI NV12 textures.
   bool enable_zero_copy_dxgi_video = false;