Use video profile to decide if we should produce fp16 textures.

media/gpu/dxva_picture_buffer_win.cc

Index: media/gpu/dxva_picture_buffer_win.cc
diff --git a/media/gpu/dxva_picture_buffer_win.cc b/media/gpu/dxva_picture_buffer_win.cc
index 390a72e1a5955217b95865d095b3f30950dc10ab..a6f417da2907d4f2ac8039d49494fb1c1c843d83 100644
--- a/media/gpu/dxva_picture_buffer_win.cc
+++ b/media/gpu/dxva_picture_buffer_win.cc
@@ -189,7 +189,10 @@ bool PbufferPictureBuffer::Initialize(const DXVAVideoDecodeAccelerator& decoder,
   eglGetConfigAttrib(egl_display, egl_config, EGL_BIND_TO_TEXTURE_RGB,
                      &use_rgb);
 
-  if (!InitializeTexture(decoder, !!use_rgb))
+  EGLint red_bits = 8;
+  eglGetConfigAttrib(egl_display, egl_config, EGL_RED_SIZE, &red_bits);
+
+  if (!InitializeTexture(decoder, !!use_rgb, red_bits == 16))
     return false;
 
   EGLint attrib_list[] = {EGL_WIDTH,
@@ -223,7 +226,8 @@ bool PbufferPictureBuffer::Initialize(const DXVAVideoDecodeAccelerator& decoder,
 
 bool PbufferPictureBuffer::InitializeTexture(
     const DXVAVideoDecodeAccelerator& decoder,
-    bool use_rgb) {
+    bool use_rgb,
+    bool use_fp16) {
   DCHECK(!texture_share_handle_);
   if (decoder.d3d11_device_) {
     D3D11_TEXTURE2D_DESC desc;
@@ -231,7 +235,11 @@ bool PbufferPictureBuffer::InitializeTexture(
     desc.Height = picture_buffer_.size().height();
     desc.MipLevels = 1;
     desc.ArraySize = 1;
-    desc.Format = DXGI_FORMAT_B8G8R8A8_UNORM;
+    if (use_fp16) {
+      desc.Format = DXGI_FORMAT_R16G16B16A16_FLOAT;
+    } else {
+      desc.Format = DXGI_FORMAT_B8G8R8A8_UNORM;
+    }
     desc.SampleDesc.Count = 1;
     desc.SampleDesc.Quality = 0;
     desc.Usage = D3D11_USAGE_DEFAULT;