Presentation API: reject screen availability observing on Android low ram devices.

chrome/browser/media/router/media_sinks_observer.h

 // Copyright 2015 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 CHROME_BROWSER_MEDIA_ROUTER_MEDIA_SINKS_OBSERVER_H_
 #define CHROME_BROWSER_MEDIA_ROUTER_MEDIA_SINKS_OBSERVER_H_
 
 #include <vector>
 
 #include "base/macros.h"
@@ skipping 17 matching lines @@
 
   // This function is invoked when the list of sinks compatible
   // with |source_| has been updated.
   // Implementations may not perform operations that modify the Media Router's
   // observer list. In particular, invoking this observer's destructor within
   // OnSinksReceived will result in undefined behavior.
   virtual void OnSinksReceived(const std::vector<MediaSink>& sinks) {}
 
   const MediaSource& source() const { return source_; }
 
+  bool is_active() const { return is_active_; }
+
  private:
   const MediaSource source_;
   MediaRouter* router_;
+  bool is_active_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaSinksObserver);
 };
 
 }  // namespace media_router
 
 #endif  // CHROME_BROWSER_MEDIA_ROUTER_MEDIA_SINKS_OBSERVER_H_