Remove limitation on the amount of maximum pending HW decoder inputs.

Plus log first few decoder frames in and out events.

BUG=b/25287910

Review URL: https://codereview.webrtc.org/1423843005

Cr-Commit-Position: refs/heads/master@{#10439}
diff --git a/talk/app/webrtc/java/jni/androidmediacodeccommon.h b/talk/app/webrtc/java/jni/androidmediacodeccommon.h
index cd1a732..348a716 100644
--- a/talk/app/webrtc/java/jni/androidmediacodeccommon.h
+++ b/talk/app/webrtc/java/jni/androidmediacodeccommon.h
@@ -74,6 +74,8 @@
 enum { kMaxPendingFramesVp8 = 1 };
 // Maximum amount of pending frames for H.264 decoder.
 enum { kMaxPendingFramesH264 = 30 };
+// Maximum amount of decoded frames for which per-frame logging is enabled.
+enum { kMaxDecodedLogFrames = 5 };
 
 static inline int64_t GetCurrentTimeMs() {
   return webrtc::TickTime::Now().Ticks() / 1000000LL;