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

content/browser/presentation/presentation_service_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 CONTENT_BROWSER_PRESENTATION_PRESENTATION_SERVICE_IMPL_H_
 #define CONTENT_BROWSER_PRESENTATION_PRESENTATION_SERVICE_IMPL_H_
 
 #include <deque>
 #include <map>
 #include <string>
@@ skipping 100 matching lines @@
       : public PresentationScreenAvailabilityListener {
    public:
     ScreenAvailabilityListenerImpl(
         const std::string& availability_url,
         PresentationServiceImpl* service);
     ~ScreenAvailabilityListenerImpl() override;
 
     // PresentationScreenAvailabilityListener implementation.
     std::string GetAvailabilityUrl() const override;
     void OnScreenAvailabilityChanged(bool available) override;
+    void OnScreenAvailabilityNotSupported() override;
 
    private:
     const std::string availability_url_;
     PresentationServiceImpl* const service_;
   };
 
   class CONTENT_EXPORT DefaultSessionStartContext {
    public:
     DefaultSessionStartContext();
     ~DefaultSessionStartContext();
@@ skipping 169 matching lines @@
 
   // NOTE: Weak pointers must be invalidated before all other member variables.
   base::WeakPtrFactory<PresentationServiceImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PresentationServiceImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_PRESENTATION_PRESENTATION_SERVICE_IMPL_H_