[Media>UI] Migrate media notification tests to JUnit tests

chrome/android/junit/src/org/chromium/chrome/browser/media/ui/MediaNotificationTestShadowResources.java

Index: chrome/android/junit/src/org/chromium/chrome/browser/media/ui/MediaNotificationTestShadowResources.java
diff --git a/chrome/android/junit/src/org/chromium/chrome/browser/media/ui/MediaNotificationTestShadowResources.java b/chrome/android/junit/src/org/chromium/chrome/browser/media/ui/MediaNotificationTestShadowResources.java
index 7febe4442deccbd874b2dae92289c0d07ed762ed..5dea1cab3a977e965f15647933b351e79bc8f82b 100644
--- a/chrome/android/junit/src/org/chromium/chrome/browser/media/ui/MediaNotificationTestShadowResources.java
+++ b/chrome/android/junit/src/org/chromium/chrome/browser/media/ui/MediaNotificationTestShadowResources.java
@@ -9,6 +9,9 @@ import static org.mockito.Mockito.doReturn;
 import static org.mockito.Mockito.mock;
 
 import android.content.res.Resources;
+import android.graphics.Color;
+import android.graphics.drawable.ColorDrawable;
+import android.graphics.drawable.Drawable;
 
 import org.robolectric.annotation.Implementation;
 import org.robolectric.annotation.Implements;
@@ -36,4 +39,9 @@ public class MediaNotificationTestShadowResources extends ShadowResources {
     public CharSequence getResourceName(int id) {
         return sResources.getResourceName(id);
     }
+
+    @Implementation
+    public Drawable getDrawable(int id, Resources.Theme theme) {
+        return new ColorDrawable(Color.RED);
+    }
 }