Mac ÜC: Fix white page hangs

content/browser/renderer_host/render_widget_helper.h

Index: content/browser/renderer_host/render_widget_helper.h
diff --git a/content/browser/renderer_host/render_widget_helper.h b/content/browser/renderer_host/render_widget_helper.h
index 466b84643097a2c56a8df56e77e95bf7385a225f..fa7666d06c2b0f2ffe375df147f00b9de8a8af1f 100644
--- a/content/browser/renderer_host/render_widget_helper.h
+++ b/content/browser/renderer_host/render_widget_helper.h
@@ -189,6 +189,14 @@ class RenderWidgetHelper
   static bool GetRenderWidgetIDForWidget(gfx::AcceleratedWidget native_widget,
                                          int* render_process_id,
                                          int* render_widget_id);
+
+  // To ensure that the message does not get dropped on the floor when
+  // the RenderWidgetHelper it is sent to is destroyed, a task is posted to
+  // handle the message. Get a token to identify this  message, to ensure that
+  // it is handled only once,
+  // TODO(ccameron): Make RenderWidgetHelper message handling less hacky.
+  // http://crbug.com/392031
+  static uint64 CreateNativeWidgetSwapToken();
 #endif
 
  private: