Support error handling for Surface readbacks

content/browser/renderer_host/render_widget_host_view_base.h

Index: content/browser/renderer_host/render_widget_host_view_base.h
diff --git a/content/browser/renderer_host/render_widget_host_view_base.h b/content/browser/renderer_host/render_widget_host_view_base.h
index ad81506b72fa5a595954417d099892a58c2a0498..30ab4c2667bbf987d36a108ea6c8036bb7b7bc7f 100644
--- a/content/browser/renderer_host/render_widget_host_view_base.h
+++ b/content/browser/renderer_host/render_widget_host_view_base.h
@@ -20,6 +20,7 @@
 #include "content/browser/renderer_host/event_with_latency_info.h"
 #include "content/common/content_export.h"
 #include "content/common/input/input_event_ack_state.h"
+#include "content/common/readback_types.h"
 #include "content/public/browser/render_widget_host_view.h"
 #include "ipc/ipc_listener.h"
 #include "third_party/WebKit/public/platform/WebScreenOrientationType.h"
@@ -59,12 +60,6 @@ struct DidOverscrollParams;
 struct NativeWebKeyboardEvent;
 struct WebPluginGeometry;
 
-// TODO(Sikugu): Though we have the return status of the result here,
-// we should add the reason for failure as a new parameter to handle cases
-// efficiently.
-typedef const base::Callback<void(bool, const SkBitmap&)>
-    CopyFromCompositingSurfaceCallback;
-
 // Basic implementation shared by concrete RenderWidgetHostView subclasses.
 class CONTENT_EXPORT RenderWidgetHostViewBase : public RenderWidgetHostView,
                                                 public IPC::Listener {