Mac: Fix flicker on gpu->nongpu transitions.

chrome/browser/renderer_host/render_widget_host.h

Index: chrome/browser/renderer_host/render_widget_host.h
diff --git a/chrome/browser/renderer_host/render_widget_host.h b/chrome/browser/renderer_host/render_widget_host.h
index 6c3fed77e826c57fb931e4ced91a766a16e89c01..0c5c4dd7bb3ea4b6f75469e8768917cae93694ad 100644
--- a/chrome/browser/renderer_host/render_widget_host.h
+++ b/chrome/browser/renderer_host/render_widget_host.h
@@ -584,6 +584,12 @@ class RenderWidgetHost : public IPC::Channel::Listener,
   // True when a page is rendered directly via the GPU process.
   bool is_gpu_rendering_active_;
 
+#if defined(OS_MACOSX)
+  // True after gpu rendering has been deactivated but the non-gpu backing
+  // store has not been repainted yet.
+  bool needs_to_hide_gpu_view_on_paint_;
+#endif
+
   // Set if we are waiting for a repaint ack for the view.
   bool repaint_ack_pending_;