Declare a new name for CompositingSurface completion callback.

content/browser/compositor/delegated_frame_host.cc

 // Copyright 2014 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.
 
 #include "content/browser/compositor/delegated_frame_host.h"
 
 #include "base/callback_helpers.h"
 #include "base/command_line.h"
 #include "cc/output/compositor_frame.h"
 #include "cc/output/compositor_frame_ack.h"
@@ skipping 125 matching lines @@
     else
       request->SendEmptyResult();
   } else {
     client_->GetLayer()->RequestCopyOfOutput(request.Pass());
   }
 }
 
 void DelegatedFrameHost::CopyFromCompositingSurface(
     const gfx::Rect& src_subrect,
     const gfx::Size& output_size,
-    const base::Callback<void(bool, const SkBitmap&)>& callback,
+    CompletionCallback& callback,
     const SkColorType color_type) {
   // Only ARGB888 and RGB565 supported as of now.
   bool format_support = ((color_type == kAlpha_8_SkColorType) ||
                          (color_type == kRGB_565_SkColorType) ||
                          (color_type == kN32_SkColorType));
   DCHECK(format_support);
   if (!CanCopyToBitmap()) {
     callback.Run(false, SkBitmap());
     return;
   }
@@ skipping 819 matching lines @@
   if (frame_provider_.get()) {
     new_layer->SetShowDelegatedContent(frame_provider_.get(),
                                        current_frame_size_in_dip_);
   }
   if (!surface_id_.is_null()) {
     new_layer->SetShowSurface(surface_id_, current_frame_size_in_dip_);
   }
 }
 
 }  // namespace content