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

chrome/android/java/src/org/chromium/chrome/browser/media/router/ChromeMediaRouter.java

Index: chrome/android/java/src/org/chromium/chrome/browser/media/router/ChromeMediaRouter.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/media/router/ChromeMediaRouter.java b/chrome/android/java/src/org/chromium/chrome/browser/media/router/ChromeMediaRouter.java
index 6c71da45feef9b2ba22c822926f41b07415c9bb1..92f626f9f48e2c72cccc45db1ef2d90e7c6f60b2 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/media/router/ChromeMediaRouter.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/media/router/ChromeMediaRouter.java
@@ -109,14 +109,19 @@ public class ChromeMediaRouter implements MediaRouteManager {
 
     /**
      * Starts background monitoring for available media sinks compatible with the given
-     * |sourceUrn|
+     * |sourceUrn| if the device is in a state that allows it.
      * @param sourceId a URL to use for filtering of the available media sinks
+     * @return whether the monitoring started (ie. was allowed).
      */
     @CalledByNative
-    public void startObservingMediaSinks(String sourceId) {
+    public boolean startObservingMediaSinks(String sourceId) {
+        if (SysUtils.isLowEndDevice()) return false;
+
         for (MediaRouteProvider provider : mRouteProviders) {
             provider.startObservingMediaSinks(sourceId);
         }
+
+        return true;
     }
 
     /**
@@ -246,4 +251,4 @@ public class ChromeMediaRouter implements MediaRouteManager {
     native void nativeOnMessageSentResult(
             long nativeMediaRouterAndroid, boolean success, int callbackId);
     native void nativeOnMessage(long nativeMediaRouterAndroid, String mediaRouteId, String message);
-}
+}