Always on statistics for AndroidMediaEncoder.

Earlier, no statistics were reported if no frames were being delivered
for encoding. This makes statics always be reported regardless of if
there are frames being delivered to the encoder.

Review-Url: https://codereview.webrtc.org/2051403002
Cr-Commit-Position: refs/heads/master@{#13122}
diff --git a/webrtc/api/java/jni/androidmediacodeccommon.h b/webrtc/api/java/jni/androidmediacodeccommon.h
index db7260a..e9eb245 100644
--- a/webrtc/api/java/jni/androidmediacodeccommon.h
+++ b/webrtc/api/java/jni/androidmediacodeccommon.h
@@ -43,6 +43,8 @@
 
 // Arbitrary interval to poll the codec for new outputs.
 enum { kMediaCodecPollMs = 10 };
+// Arbitrary interval to poll at when there should be no more frames.
+enum { kMediaCodecPollNoFramesMs = 100 };
 // Media codec maximum output buffer ready timeout.
 enum { kMediaCodecTimeoutMs = 1000 };
 // Interval to print codec statistics (bitrate, fps, encoding/decoding time).