Support error handling for Surface readbacks

content/browser/renderer_host/render_widget_host_impl.cc

Index: content/browser/renderer_host/render_widget_host_impl.cc
diff --git a/content/browser/renderer_host/render_widget_host_impl.cc b/content/browser/renderer_host/render_widget_host_impl.cc
index 38b255017638b94d4942ee8a6b5c7819d4f22b20..113ef21a840307cb39af71801bdeadcc0f429e8d 100644
--- a/content/browser/renderer_host/render_widget_host_impl.cc
+++ b/content/browser/renderer_host/render_widget_host_impl.cc
@@ -670,7 +670,7 @@ void RenderWidgetHostImpl::ViewDestroyed() {
 void RenderWidgetHostImpl::CopyFromBackingStore(
     const gfx::Rect& src_subrect,
     const gfx::Size& accelerated_dst_size,
-    const base::Callback<void(bool, const SkBitmap&)>& callback,
+    CopyFromCompositingSurfaceCallback& callback,
     const SkColorType color_type) {
   if (view_) {
     TRACE_EVENT0("browser",
@@ -682,7 +682,7 @@ void RenderWidgetHostImpl::CopyFromBackingStore(
     return;
   }
 
-  callback.Run(false, SkBitmap());
+  callback.Run(false, SkBitmap(), content::READBACK_FAILED);
 }
 
 bool RenderWidgetHostImpl::CanCopyFromBackingStore() {