Query the preferred readback config in CopyFromBackingStore

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 700 matching lines @@
 void RenderWidgetHostImpl::SetIsLoading(bool is_loading) {
   is_loading_ = is_loading;
   if (!view_)
     return;
   view_->SetIsLoading(is_loading);
 }
 
 void RenderWidgetHostImpl::CopyFromBackingStore(
     const gfx::Rect& src_subrect,
     const gfx::Size& accelerated_dst_size,
-    const base::Callback<void(bool, const SkBitmap&)>& callback) {
+    const base::Callback<void(bool, const SkBitmap&)>& callback,
+    const SkBitmap::Config& bitmap_config) {
   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,
-                                      SkBitmap::kARGB_8888_Config);
+    view_->CopyFromCompositingSurface(
+        accelerated_copy_rect, accelerated_dst_size, callback, bitmap_config);
     return;
   }
 
   BackingStore* backing_store = GetBackingStore(false);
   if (!backing_store) {
     callback.Run(false, SkBitmap());
     return;
   }
 
   TRACE_EVENT0("browser",
@@ skipping 1784 matching lines @@
       ++lc;
     }
   }
 
   // Add newly generated components into the latency info
   for (lc = new_components.begin(); lc != new_components.end(); ++lc) {
     latency_info->latency_components[lc->first] = lc->second;
   }
 }
 
+SkBitmap::Config RenderWidgetHostImpl::PreferredReadbackFormat() {
+  if (view_)
+    return view_->PreferredReadbackFormat();
+  return SkBitmap::kARGB_8888_Config;
+}
+
 }  // namespace content