[Android] Update all Robolectric tests to Robolectric 3.0

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

Index: chrome/android/junit/src/org/chromium/chrome/browser/media/router/ChromeMediaRouterSinkObservationTest.java
diff --git a/chrome/android/junit/src/org/chromium/chrome/browser/media/router/ChromeMediaRouterSinkObservationTest.java b/chrome/android/junit/src/org/chromium/chrome/browser/media/router/ChromeMediaRouterSinkObservationTest.java
index 4c85f8ef7bd3ee5baf0744346c329edcc01f3ddc..96c7a14a832c5595384e268449a01e67e2d36b5d 100644
--- a/chrome/android/junit/src/org/chromium/chrome/browser/media/router/ChromeMediaRouterSinkObservationTest.java
+++ b/chrome/android/junit/src/org/chromium/chrome/browser/media/router/ChromeMediaRouterSinkObservationTest.java
@@ -9,6 +9,8 @@ import static org.junit.Assert.assertTrue;
 
 import android.os.Build;
 
+import org.chromium.base.Log;
+import org.chromium.base.SysUtils;
 import org.chromium.base.test.util.Feature;
 import org.chromium.chrome.browser.media.router.cast.MediaSink;
 import org.chromium.testing.local.LocalRobolectricTestRunner;
@@ -16,6 +18,7 @@ import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.robolectric.annotation.Config;
 
+import java.lang.reflect.Field;
 import java.util.ArrayList;
 import java.util.List;
 
@@ -23,9 +26,11 @@ import java.util.List;
  * Sink observation tests for ChromeMediaRouter.
  */
 @RunWith(LocalRobolectricTestRunner.class)
-@Config(manifest = Config.NONE,
-        shadows = { ChromeMediaRouterTestBase.FakeActivityManager.class })
+@Config(manifest = Config.NONE)
 public class ChromeMediaRouterSinkObservationTest extends ChromeMediaRouterTestBase {
+
+    private static final String TAG = "SinkObservationTest";;
+
     @Test
     @Feature({"MediaRouter"})
     public void testRouterOnSinksReceived() {
@@ -92,16 +97,27 @@ public class ChromeMediaRouterSinkObservationTest extends ChromeMediaRouterTestB
 
     @Test
     @Feature({"MediaRouter"})
-    public void testNotLowRamDevice() {
-        sIsLowRamDevice = false;
+    public void testNotLowRamDevice() throws Exception {
+        setIsLowRamDevice(false);
         assertTrue(mChromeMediaRouter.startObservingMediaSinks(SOURCE_ID1));
     }
 
     @Test
     @Feature({"MediaRouter"})
-    public void testIsLowRamDevice() {
-        sIsLowRamDevice = true;
+    public void testIsLowRamDevice() throws Exception {
+        setIsLowRamDevice(true);
         assertEquals(Build.VERSION.SDK_INT <= Build.VERSION_CODES.JELLY_BEAN_MR2,
                      mChromeMediaRouter.startObservingMediaSinks(SOURCE_ID1));
     }
+
+    private void setIsLowRamDevice(Boolean isLowRamDevice) throws Exception {
+        try {
+            Field field = SysUtils.class.getDeclaredField("sLowEndDevice");

[Ted C, 2016/08/03 19:18:26]

We should really, really, really try to never use reflection for code we own. 
For these tests, can they use command lines?

BaseSwitches.ENABLE_LOW_END_DEVICE_MODE
BaseSwitches.DISABLE_LOW_END_DEVICE_MODE

Both exist for tests doing exactly this.

[mikecase (-- gone --), 2016/08/05 03:17:07]

Didn't know these switches existed. Fixed. Way simpler/better now.

+            field.setAccessible(true);
+            field.set(null, isLowRamDevice);
+        } catch (NoSuchFieldException e) {
+            Log.e(TAG, "sLowEndDevice field was changed in SysUtils. Must update this test.");
+            throw e;
+        }
+    }
 }