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 9a1d709a2ef00f024c3194de5ec841498afcfc3b..1301cac24a42d7fd64a43528d19d260278bc5226 100644
--- a/content/browser/renderer_host/render_widget_host_impl.cc
+++ b/content/browser/renderer_host/render_widget_host_impl.cc
@@ -675,7 +675,7 @@ 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,
+    ReadbackRequestCallback& callback,
     const SkColorType color_type) {
   if (view_) {
     TRACE_EVENT0("browser",
@@ -687,7 +687,7 @@ void RenderWidgetHostImpl::CopyFromBackingStore(
     return;
   }
 
-  callback.Run(false, SkBitmap());
+  callback.Run(SkBitmap(), content::READBACK_FAILED);
 }
 
 bool RenderWidgetHostImpl::CanCopyFromBackingStore() {