Ignore show messages from RemoteFrames when the WebContents is hidden.

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 a72360c42728ceeb3eabb72701806cbb68b1ea6b..117ea37440b2378b878c1d998c6c76d1834920e9 100644
--- a/content/browser/renderer_host/render_widget_host_delegate.h
+++ b/content/browser/renderer_host/render_widget_host_delegate.h
@@ -177,7 +177,7 @@ class CONTENT_EXPORT RenderWidgetHostDelegate {
   virtual void ForwardCompositorProto(RenderWidgetHostImpl* render_widget_host,
                                       const std::vector<uint8_t>& proto) {}
 
-  // Called when the visibility of the RenderFrameProxyHost in outter
+  // Called when the visibility of the RenderFrameProxyHost in outer
   // WebContents changes. This method is only called on an inner WebContents and
   // will eventually notify all the RenderWidgetHostViews belonging to that
   // WebContents.
@@ -194,6 +194,12 @@ class CONTENT_EXPORT RenderWidgetHostDelegate {
   // Returns the TextInputManager tracking text input state.
   virtual TextInputManager* GetTextInputManager();
 
+  // Returns true if this RenderWidgetHost should remain hidden. This is used by
+  // the RenderWidgetHost to ask the delegate if it can be shown in the event of
+  // something other than the WebContents attempting to enable visibility of
+  // this RenderWidgetHost.
+  virtual bool IsHidden();
+
  protected:
   virtual ~RenderWidgetHostDelegate() {}
 };