H264 HW encode using MediaFoundation

media/gpu/ipc/service/gpu_video_encode_accelerator.cc

Index: media/gpu/ipc/service/gpu_video_encode_accelerator.cc
diff --git a/media/gpu/ipc/service/gpu_video_encode_accelerator.cc b/media/gpu/ipc/service/gpu_video_encode_accelerator.cc
index dc4e51591bd843e8e2d8486bf12f5d967bf21046..67fcf094c6c99f4dcb05424b0e2aa6666ffd7eea 100644
--- a/media/gpu/ipc/service/gpu_video_encode_accelerator.cc
+++ b/media/gpu/ipc/service/gpu_video_encode_accelerator.cc
@@ -35,6 +35,9 @@
 #include "media/gpu/android_video_encode_accelerator.h"
 #elif defined(OS_MACOSX)
 #include "media/gpu/vt_video_encode_accelerator_mac.h"
+#elif defined(OS_WIN)
+#include "media/base/media_switches.h"
+#include "media/gpu/media_foundation_video_encode_accelerator_win.h"
 #endif
 
 namespace media {
@@ -208,6 +211,13 @@ GpuVideoEncodeAccelerator::CreateVEAFps(
 #if defined(OS_MACOSX)
   create_vea_fps.push_back(&GpuVideoEncodeAccelerator::CreateVTVEA);
 #endif
+#if defined(OS_WIN)
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kEnableWinHWH264Encoding)) {
+    create_vea_fps.push_back(
+        &GpuVideoEncodeAccelerator::CreateMediaFoundationVEA);
+  }
+#endif
   return create_vea_fps;
 }
 
@@ -250,6 +260,15 @@ GpuVideoEncodeAccelerator::CreateVTVEA() {
 }
 #endif
 
+#if defined(OS_WIN)
+// static
+std::unique_ptr<media::VideoEncodeAccelerator>
+GpuVideoEncodeAccelerator::CreateMediaFoundationVEA() {
+  return base::WrapUnique<media::VideoEncodeAccelerator>(
+      new MediaFoundationVideoEncodeAccelerator());
+}
+#endif
+
 void GpuVideoEncodeAccelerator::OnEncode(
     const AcceleratedVideoEncoderMsg_Encode_Params& params) {
   DVLOG(3) << "GpuVideoEncodeAccelerator::OnEncode: frame_id = "