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

chrome/android/junit/src/org/chromium/chrome/browser/media/router/ChromeMediaRouterTest.java

Index: chrome/android/junit/src/org/chromium/chrome/browser/media/router/ChromeMediaRouterTest.java
diff --git a/chrome/android/junit/src/org/chromium/chrome/browser/media/router/ChromeMediaRouterTest.java b/chrome/android/junit/src/org/chromium/chrome/browser/media/router/ChromeMediaRouterTest.java
new file mode 100644
index 0000000000000000000000000000000000000000..5f623e8663d8d7da685a77d58fa5724060c02a1b
--- /dev/null
+++ b/chrome/android/junit/src/org/chromium/chrome/browser/media/router/ChromeMediaRouterTest.java
@@ -0,0 +1,67 @@
+// 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.
+
+package org.chromium.chrome.browser.media.router;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+import android.app.ActivityManager;
+import android.os.Build;
+
+import org.chromium.base.test.util.Feature;
+import org.chromium.testing.local.LocalRobolectricTestRunner;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.Robolectric;
+import org.robolectric.annotation.Config;
+import org.robolectric.annotation.Implementation;
+import org.robolectric.annotation.Implements;
+import org.robolectric.shadows.ShadowActivityManager;
+
+/**
+ * Robolectric tests for ChromeMediaRouter.
+ */
+@RunWith(LocalRobolectricTestRunner.class)
+@Config(manifest = Config.NONE,
+        shadows = { ChromeMediaRouterTest.FakeActivityManager.class })
+public class ChromeMediaRouterTest {
+
+    private static boolean sIsLowRamDevice;
+    private ChromeMediaRouter mChromeMediaRouter;
+
+    /**
+     * Robolectric's ShadowActivityManager implementation in order to extend
+     * isLowRamDevice and be able to instrument the tests.
+     */
+    @Implements(ActivityManager.class)
+    public static class FakeActivityManager extends ShadowActivityManager {
+        @Implementation
+        public boolean isLowRamDevice() {
+            return sIsLowRamDevice;
+        }
+    }
+
+    @Before
+    public void setUp() {
+        sIsLowRamDevice = false;
+        mChromeMediaRouter = new ChromeMediaRouter(0, Robolectric.application);
+    }
+
+    @Test
+    @Feature({"MediaRouter"})
+    public void testNotLowRamDevice() {
+        sIsLowRamDevice = false;
+        assertTrue(mChromeMediaRouter.startObservingMediaSinks(""));
+    }
+
+    @Test
+    @Feature({"MediaRouter"})
+    public void testIsLowRamDevice() {
+        sIsLowRamDevice = true;
+        assertEquals(Build.VERSION.SDK_INT <= Build.VERSION_CODES.JELLY_BEAN_MR2,
+                     mChromeMediaRouter.startObservingMediaSinks(""));
+    }
+}