Allow to use {FFmpeg/Vpx}VideoDecoder from a UtilityProcess

media/mojo/common/mojo_shared_buffer_video_frame.h

Index: media/mojo/common/mojo_shared_buffer_video_frame.h
diff --git a/media/mojo/common/mojo_shared_buffer_video_frame.h b/media/mojo/common/mojo_shared_buffer_video_frame.h
index 945f43e51f38ec57e6279a8e8e9538d6e7772fd7..7d2ae52163529a03bc6d7af1c11628ca14208a0a 100644
--- a/media/mojo/common/mojo_shared_buffer_video_frame.h
+++ b/media/mojo/common/mojo_shared_buffer_video_frame.h
@@ -40,6 +40,15 @@ class MojoSharedBufferVideoFrame : public VideoFrame {
       base::Callback<void(mojo::ScopedSharedBufferHandle buffer,
                           size_t capacity)>;
 
+  static scoped_refptr<MojoSharedBufferVideoFrame>
+  WrapMojoSharedBufferVideoFrame(
+      const scoped_refptr<MojoSharedBufferVideoFrame>& frame);
+
+  static scoped_refptr<MojoSharedBufferVideoFrame> CreateYUV(
+      VideoPixelFormat format,
+      const gfx::Size& dimensions,
+      base::TimeDelta timestamp);
+
   // Creates a new I420 frame in shared memory with provided parameters
   // (coded_size() == natural_size() == visible_rect()), or returns nullptr.
   // Buffers for the frame are allocated but not initialized. The caller must