Fixing WebViewVisibilityTests for OOPIF-<webview>.

content/browser/renderer_host/render_widget_host_delegate.h

Index: content/browser/renderer_host/render_widget_host_delegate.h
diff --git a/content/browser/renderer_host/render_widget_host_delegate.h b/content/browser/renderer_host/render_widget_host_delegate.h
index f7fbb0e362247ff0b078db858a933b09e2e394d1..4c0fea95f6e5c73204fab031a5bdd1225a292eef 100644
--- a/content/browser/renderer_host/render_widget_host_delegate.h
+++ b/content/browser/renderer_host/render_widget_host_delegate.h
@@ -175,11 +175,17 @@ class CONTENT_EXPORT RenderWidgetHostDelegate {
   virtual gfx::NativeViewAccessible GetParentNativeViewAccessible();
 #endif
 
-  // Called when the widget has sent a compositor proto.  This is used in Blimp
+  // Called when the widget has sent a compositor proto.  This is used in Btlimp
   // mode with the RemoteChannel compositor.
   virtual void ForwardCompositorProto(RenderWidgetHostImpl* render_widget_host,
                                       const std::vector<uint8_t>& proto) {}
 
+  // Called when the visibility of the RenderFrameProxyHost in outter
+  // WebContents changes. This method is only called on an inner WebContents and
+  // will eventually notify all the RenderWidgetHostViews belonging to that
+  // WebContents.
+  virtual void OnRenderFrameProxyVisibilityChanged(bool visible) {}
+
  protected:
   virtual ~RenderWidgetHostDelegate() {}
 };