MojoCompositorFrameSinkPrivate should support copy requests

cc/output/copy_output_request.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_OUTPUT_COPY_OUTPUT_REQUEST_H_
 #define CC_OUTPUT_COPY_OUTPUT_REQUEST_H_
 
 #include <memory>
 
 #include "base/callback.h"
@@ skipping 56 matching lines @@
   bool has_area() const { return area_.has_value(); }
   const gfx::Rect& area() const { return *area_; }
 
   // By default copy requests create a new TextureMailbox to return contents
   // in. This allows a client to provide a TextureMailbox, and the compositor
   // will place the result inside the TextureMailbox.
   void SetTextureMailbox(const TextureMailbox& texture_mailbox);
   bool has_texture_mailbox() const { return texture_mailbox_.has_value(); }
   const TextureMailbox& texture_mailbox() const { return *texture_mailbox_; }
 
+  void set_result_callback(CopyOutputRequestCallback result_callback) {

[Fady Samuel, 2017/02/15 13:32:20]

Is this still necessary? Thanks!

[Saman Sami, 2017/02/15 22:53:56]

Not after my other CL lands. I'll get rid of it.

+    result_callback_ = result_callback;
+  }
+  const CopyOutputRequestCallback& result_callback() {
+    return result_callback_;
+  }
+
   void SendEmptyResult();
   void SendBitmapResult(std::unique_ptr<SkBitmap> bitmap);
   void SendTextureResult(
       const gfx::Size& size,
       const TextureMailbox& texture_mailbox,
       std::unique_ptr<SingleReleaseCallback> release_callback);
 
   void SendResult(std::unique_ptr<CopyOutputResult> result);
 
  private:
   friend struct mojo::StructTraits<mojom::CopyOutputRequestDataView,
                                    std::unique_ptr<CopyOutputRequest>>;
 
   CopyOutputRequest();
   CopyOutputRequest(bool force_bitmap_result,
                     const CopyOutputRequestCallback& result_callback);
 
   base::Optional<base::UnguessableToken> source_;
   bool force_bitmap_result_;
   base::Optional<gfx::Rect> area_;
   base::Optional<TextureMailbox> texture_mailbox_;
   CopyOutputRequestCallback result_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(CopyOutputRequest);
 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_COPY_OUTPUT_REQUEST_H_