blimp: Update page load status update indicator to use first paint.

content/public/browser/web_contents_observer.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_OBSERVER_H_
 #define CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_OBSERVER_H_
 
 #include <stdint.h>
 
 #include "base/macros.h"
@@ skipping 300 matching lines @@
                                    RenderFrameHost* source_render_frame_host,
                                    const GURL& url,
                                    const Referrer& referrer,
                                    WindowOpenDisposition disposition,
                                    ui::PageTransition transition) {}
 
   // This method is invoked when the renderer process has completed its first
   // paint after a non-empty layout.
   virtual void DidFirstVisuallyNonEmptyPaint() {}
 
+  // This method is invoked when the main frame in the renderer performs the

[nasko, 2016/05/24 21:39:22]

nit: s/renderer/renderer process/

[Khushal, 2016/05/26 01:43:00]

Done.

+  // first paint after a navigation.
+  virtual void DidFirstPaintAfterLoad(RenderWidgetHost* render_widget_host) {}
+
   // When WebContents::Stop() is called, the WebContents stops loading and then
   // invokes this method. If there are ongoing navigations, their respective
   // failure methods will also be invoked.
   virtual void NavigationStopped() {}
 
   // Called when there has been direct user interaction with the WebContents.
   // The type argument specifies the kind of interaction. Direct user input
   // signalled through this callback includes:
   // 1) any mouse down event (blink::WebInputEvent::MouseDown);
   // 2) the start of a scroll (blink::WebInputEvent::GestureScrollBegin);
@@ skipping 153 matching lines @@
   void ResetWebContents();
 
   WebContentsImpl* web_contents_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsObserver);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_OBSERVER_H_