Provide a default return value for mock_audio_device_.TimeUntilNextProcess.

webrtc/test/mock_voice_engine.h

Index: webrtc/test/mock_voice_engine.h
diff --git a/webrtc/test/mock_voice_engine.h b/webrtc/test/mock_voice_engine.h
index a55489b788c67b999d395bc49230369130a23933..722f601b79c186658814aa11716818d8d28d1832 100644
--- a/webrtc/test/mock_voice_engine.h
+++ b/webrtc/test/mock_voice_engine.h
@@ -55,6 +55,8 @@ class MockVoiceEngine : public VoiceEngineImpl {
           return proxy;
         }));
 
+    ON_CALL(mock_audio_device_, TimeUntilNextProcess())
+        .WillByDefault(testing::Return(1000));
     ON_CALL(*this, audio_device_module())
         .WillByDefault(testing::Return(&mock_audio_device_));
     ON_CALL(*this, audio_processing())