Expose locks for CopyFromCompositingSurface/CopyFromBackingStore API

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 724 matching lines @@
       "RenderWidgetHostImpl::CopyFromBackingStore::FromBackingStore");
   gfx::Rect copy_rect = src_subrect.IsEmpty() ?
       gfx::Rect(backing_store->size()) : src_subrect;
   // When the result size is equal to the backing store size, copy from the
   // backing store directly to the output canvas.
   skia::PlatformBitmap output;
   bool result = backing_store->CopyFromBackingStore(copy_rect, &output);
   callback.Run(result, output.GetBitmap());
 }
 
+bool RenderWidgetHostImpl::CanCopyFromBackingStore() {
+  if (view_)
+    return view_->IsSurfaceAvailableForCopy();
+  return false;
+}
+
+#if defined(OS_ANDROID)
+void RenderWidgetHostImpl::LockBackingStore() {
+  if (view_)
+    view_->LockCompositingSurface();
+}
+
+void RenderWidgetHostImpl::UnlockBackingStore() {
+  if (view_)
+    view_->UnlockCompositingSurface();
+}
+#endif
+
 #if defined(TOOLKIT_GTK)
 bool RenderWidgetHostImpl::CopyFromBackingStoreToGtkWindow(
     const gfx::Rect& dest_rect, GdkWindow* target) {
   BackingStore* backing_store = GetBackingStore(false);
   if (!backing_store)
     return false;
   (static_cast<BackingStoreGtk*>(backing_store))->PaintToRect(
       dest_rect, target);
   return true;
 }
@@ skipping 1771 matching lines @@
   }
 }
 
 SkBitmap::Config RenderWidgetHostImpl::PreferredReadbackFormat() {
   if (view_)
     return view_->PreferredReadbackFormat();
   return SkBitmap::kARGB_8888_Config;
 }
 
 }  // namespace content