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

chrome/browser/media/router/media_router_mojo_impl.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_ROUTER_MOJO_IMPL_H_
 #define CHROME_BROWSER_MEDIA_ROUTER_MEDIA_ROUTER_MOJO_IMPL_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 110 matching lines @@
   void EnqueueTask(const base::Closure& closure);
 
   // Runs a closure if the extension monitored by |extension_monitor_| is
   // active, or defers it for later execution if the extension is suspended.
   void RunOrDefer(const base::Closure& request);
 
   // Dispatches the Mojo requests queued in |pending_requests_|.
   void ExecutePendingRequests();
 
   // MediaRouter implementation.
-  void RegisterMediaSinksObserver(MediaSinksObserver* observer) override;
+  bool RegisterMediaSinksObserver(MediaSinksObserver* observer) override;
   void UnregisterMediaSinksObserver(MediaSinksObserver* observer) override;
   void RegisterMediaRoutesObserver(MediaRoutesObserver* observer) override;
   void UnregisterMediaRoutesObserver(MediaRoutesObserver* observer) override;
   void RegisterIssuesObserver(IssuesObserver* observer) override;
   void UnregisterIssuesObserver(IssuesObserver* observer) override;
   void RegisterPresentationSessionMessagesObserver(
       PresentationSessionMessagesObserver* observer) override;
   void UnregisterPresentationSessionMessagesObserver(
       PresentationSessionMessagesObserver* observer) override;
 
@@ skipping 93 matching lines @@
   std::string instance_id_;
 
   base::ThreadChecker thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaRouterMojoImpl);
 };
 
 }  // namespace media_router
 
 #endif  // CHROME_BROWSER_MEDIA_ROUTER_MEDIA_ROUTER_MOJO_IMPL_H_