Fix scroll restoration when exiting fullscreen mode.

content/browser/frame_host/render_frame_host_delegate.h

 // Copyright 2013 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_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_DELEGATE_H_
 #define CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_DELEGATE_H_
 
 #include <stdint.h>
 
 #include <vector>
@@ skipping 135 matching lines @@
   virtual GeolocationServiceContext* GetGeolocationServiceContext();
 
   // Gets the WakeLockServiceContext associated with this delegate.
   virtual WakeLockServiceContext* GetWakeLockServiceContext();
 
   // Notification that the frame wants to go into fullscreen mode.
   // |origin| represents the origin of the frame that requests fullscreen.
   virtual void EnterFullscreenMode(const GURL& origin) {}
 
   // Notification that the frame wants to go out of fullscreen mode.
-  virtual void ExitFullscreenMode() {}
+  // |will_cause_resize| can be false in the case where we exit tab fullscreen

[Avi (use Gerrit), 2016/01/05 16:17:57]

"can be false"? Please write a comment about when a parameter *will* or *will
not* be true or false, rather than when it might or might not.

Perhaps, "|will_cause_resize| will be false in the case..."

[bokan, 2016/01/05 17:15:47]

Thanks, I've reworded the whole thing to be more clear.

+  // into browser fullscreen and thus won't cause bounds to change.
+  virtual void ExitFullscreenMode(bool will_cause_resize) {}
 
   // Let the delegate decide whether postMessage should be delivered to
   // |target_rfh| from a source frame in the given SiteInstance.  This defaults
   // to false and overrides the RenderFrameHost's decision if true.
   virtual bool ShouldRouteMessageEvent(
       RenderFrameHost* target_rfh,
       SiteInstance* source_site_instance) const;
 
   // Ensure that |source_rfh| has swapped-out RenderViews and
   // RenderFrameProxies for itself and for all frames on its opener chain in
@@ skipping 17 matching lines @@
   virtual gfx::NativeViewAccessible GetParentNativeViewAccessible();
 #endif
 
  protected:
   virtual ~RenderFrameHostDelegate() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_DELEGATE_H_