Deliver IPC messages together with SwapCompositorFrame

content/browser/web_contents/web_contents_impl.h

Index: content/browser/web_contents/web_contents_impl.h
diff --git a/content/browser/web_contents/web_contents_impl.h b/content/browser/web_contents/web_contents_impl.h
index 7db4ec60b0e01d82c78a5bbe5ca187194df4300a..fee4d66371ec5914289a32ba2d0a597ae4f2c315 100644
--- a/content/browser/web_contents/web_contents_impl.h
+++ b/content/browser/web_contents/web_contents_impl.h
@@ -32,6 +32,7 @@
 #include "content/public/common/page_transition_types.h"
 #include "content/public/common/renderer_preferences.h"
 #include "content/public/common/three_d_api_types.h"
+#include "content/public/common/widget_visible_state.h"
 #include "net/base/load_states.h"
 #include "third_party/WebKit/public/web/WebDragOperation.h"
 #include "ui/gfx/rect_f.h"
@@ -762,7 +763,7 @@ class CONTENT_EXPORT WebContentsImpl
                                const base::string16& sub_text);
   void OnHideValidationMessage();
   void OnMoveValidationMessage(const gfx::Rect& anchor_in_root_view);
-
+  void OnWidgetVisibleStateChanged(WidgetVisibleState widget_visible_state);
 
   // Called by derived classes to indicate that we're no longer waiting for a
   // response. This won't actually update the throbber, but it will get picked