Push API: Don't require notification if tab is visible.

content/browser/web_contents/web_contents_impl.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_BROWSER_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_
 #define CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 162 matching lines @@
   void DidGetRedirectForResourceRequest(
       RenderFrameHost* render_frame_host,
       const ResourceRedirectDetails& details);
 
   WebContentsView* GetView() const;
 
   ScreenOrientationDispatcherHost* screen_orientation_dispatcher_host() {
     return screen_orientation_dispatcher_host_.get();
   }
 
-  bool should_normally_be_visible() { return should_normally_be_visible_; }
+  bool should_normally_be_visible() const {
+    return should_normally_be_visible_;
+  }
 
   // Indicate if the window has been occluded, and pass this to the views, only
   // if there is no active capture going on (otherwise it is dropped on the
   // floor).
   void WasOccluded();
   void WasUnOccluded();
 
   // Broadcasts the mode change to all frames.
   void SetAccessibilityMode(AccessibilityMode mode);
 
@@ skipping 1072 matching lines @@
   // Adds/removes a callback called on creation of each new WebContents.
   static void AddCreatedCallbackForTesting(const CreatedCallback& callback);
   static void RemoveCreatedCallbackForTesting(const CreatedCallback& callback);
 
   DISALLOW_COPY_AND_ASSIGN(FriendZone);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_