Fire visibilityChange event on out-of-process iframes.

third_party/WebKit/public/web/WebView.h

 /*
  * Copyright (C) 2009, 2010, 2011, 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 109 matching lines @@
     using WebWidget::didChangeWindowResizerRect;
     using WebWidget::backgroundColor;
     using WebWidget::pagePopup;
     using WebWidget::updateTopControlsState;
 
     // Initialization ------------------------------------------------------
 
     // Creates a WebView that is NOT yet initialized. You will need to
     // call setMainFrame to finish the initialization. It is valid
     // to pass a null client pointer.
-    BLINK_EXPORT static WebView* create(WebViewClient*);
+    BLINK_EXPORT static WebView* create(WebViewClient*, bool);

[Charlie Reis, 2016/06/06 23:15:09]

This seems like it needs some explanation.  (At first glance, I'm not sure if it
means visible or hidden, even knowing the context of this CL.  And worse, it
means visible, but we use hidden in other places like
FrameTree::CreateRenderViewHost.)

[dcheng, 2016/06/07 05:28:57]

We should just plumb WebPageVisibilityState through here.

[lfg, 2016/06/08 20:00:24]

Done.

 
     // After creating a WebView, you should immediately call this method.
     // You can optionally modify the settings before calling this method.
     // This WebFrame will receive events for the main frame and must not
     // be null.
     virtual void setMainFrame(WebFrame*) = 0;
 
     // Initializes the various client interfaces.
     virtual void setCredentialManagerClient(WebCredentialManagerClient*) = 0;
     virtual void setPrerendererClient(WebPrerendererClient*) = 0;
@@ skipping 393 matching lines @@
     // completed.
     WebWidget* widget() { return this; }
 
 protected:
     ~WebView() {}
 };
 
 } // namespace blink
 
 #endif