[Media, Video] Update WMPI when the pipeline gets a new average keyframe distance.

media/test/pipeline_integration_test_base.h

Index: media/test/pipeline_integration_test_base.h
diff --git a/media/test/pipeline_integration_test_base.h b/media/test/pipeline_integration_test_base.h
index 064fd17f8391ec3fd31255ea5d604d5ff5775af5..192d6f837220cf5b1af795ced11046934d4383e0 100644
--- a/media/test/pipeline_integration_test_base.h
+++ b/media/test/pipeline_integration_test_base.h
@@ -206,6 +206,7 @@ class PipelineIntegrationTestBase : public Pipeline::Client {
   MOCK_METHOD0(OnWaitingForDecryptionKey, void(void));
   MOCK_METHOD1(OnVideoNaturalSizeChange, void(const gfx::Size&));
   MOCK_METHOD1(OnVideoOpacityChange, void(bool));
+  MOCK_METHOD0(OnVideoAverageKeyframeDistanceUpdate, void());
 };
 
 }  // namespace media