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..58d8d7073eedefc16876ee22a6d41c7a7c89805f 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,
+  // intended to be used as a bitfield.
+  // VPX_VENDOR_ALL should be updated whenever a new entry is added.
+  enum VpxDecodeVendors {
+    VPX_VENDOR_NONE = 0x00,
+    VPX_VENDOR_MICROSOFT = 0x01,
+    VPX_VENDOR_AMD = 0x02,
+    VPX_VENDOR_ALL = 0x03,
+  };
   // ===================================
   // Settings from //content/public/common/content_switches.h
 
@@ -49,7 +58,8 @@ struct GPU_EXPORT GpuPreferences {
 
 #if defined(OS_WIN)
   // Enables experimental hardware acceleration for VP8/VP9 video decoding.
-  bool enable_accelerated_vpx_decode = false;
+  // Bitmask - 0x1=Microsoft, 0x2=AMD, 0x03=Try all.
+  VpxDecodeVendors enable_accelerated_vpx_decode = VPX_VENDOR_MICROSOFT;
 
   // Enables support for avoiding copying DXGI NV12 textures.
   bool enable_zero_copy_dxgi_video = false;