Add IMA tests to presubmit

Also fix internal build by adding some methods.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=213828434

extensions/ima/src/test/java/com/google/android/exoplayer2/ext/ima/FakeAd.java

@@ -64,6 +64,18 @@ import java.util.Set;
         };
   }
 
+  public int getVastMediaWidth() {
+    throw new UnsupportedOperationException();
+  }
+
+  public int getVastMediaHeight() {
+    throw new UnsupportedOperationException();
+  }
+
+  public int getVastMediaBitrate() {
+    throw new UnsupportedOperationException();
+  }
+
   @Override
   public boolean isSkippable() {
     return skippable;