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

chrome/browser/media/router/media_router_mojo_impl.cc

Index: chrome/browser/media/router/media_router_mojo_impl.cc
diff --git a/chrome/browser/media/router/media_router_mojo_impl.cc b/chrome/browser/media/router/media_router_mojo_impl.cc
index cfdd2b8d355f2b346a4fab1c63550b3c26781c9b..a630e617fd2b1514e31b350e15e6fb911cdc2078 100644
--- a/chrome/browser/media/router/media_router_mojo_impl.cc
+++ b/chrome/browser/media/router/media_router_mojo_impl.cc
@@ -275,7 +275,7 @@ void MediaRouterMojoImpl::OnPresentationSessionDetached(
                         base::Unretained(this), route_id));
 }
 
-void MediaRouterMojoImpl::RegisterMediaSinksObserver(
+bool MediaRouterMojoImpl::RegisterMediaSinksObserver(
     MediaSinksObserver* observer) {
   DCHECK(thread_checker_.CalledOnValidThread());
 
@@ -297,6 +297,7 @@ void MediaRouterMojoImpl::RegisterMediaSinksObserver(
   observer_list->AddObserver(observer);
   RunOrDefer(base::Bind(&MediaRouterMojoImpl::DoStartObservingMediaSinks,
                         base::Unretained(this), source_id));
+  return true;
 }
 
 void MediaRouterMojoImpl::UnregisterMediaSinksObserver(