Support format using enum argument for Async readback

content/browser/renderer_host/render_widget_host_impl.cc

 // Copyright (c) 2012 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/renderer_host/render_widget_host_impl.h"
 
 #include <math.h>
 #include <set>
 #include <utility>
 
@@ skipping 707 matching lines @@
     const gfx::Size& accelerated_dst_size,
     const base::Callback<void(bool, const SkBitmap&)>& callback) {
   if (view_ && is_accelerated_compositing_active_) {
     TRACE_EVENT0("browser",
         "RenderWidgetHostImpl::CopyFromBackingStore::FromCompositingSurface");
     gfx::Rect accelerated_copy_rect = src_subrect.IsEmpty() ?
         gfx::Rect(view_->GetViewBounds().size()) : src_subrect;
     view_->CopyFromCompositingSurface(accelerated_copy_rect,
                                       accelerated_dst_size,
                                       callback,
-                                      false);
+                                      SkBitmap::kARGB_8888_Config);
     return;
   }
 
   BackingStore* backing_store = GetBackingStore(false);
   if (!backing_store) {
     callback.Run(false, SkBitmap());
     return;
   }
 
   TRACE_EVENT0("browser",
@@ skipping 1774 matching lines @@
         }
         RenderWidgetHostImpl* rwhi = RenderWidgetHostImpl::From(rwh);
         if (rwhi_set.insert(rwhi).second)
           rwhi->FrameSwapped(latency_info[i]);
       }
     }
   }
 }
 
 }  // namespace content