[Chromecast] Increase the minimum buffer time padding.

Multizone follower on Android is not working because insufficient time
was given for pushing data to the audio pipeline. This resulted in
cropped audio buffers.

Bug: 117832377
Test: Tested multizone follower on atv and android things
Change-Id: I92e8fbb39fa904fd3b38e4fb28d418d3e4272ac1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1742995Reviewed-by: Kenneth MacKay <kmackay@chromium.org>
Commit-Queue: Alex Leung <alexleung@google.com>
Cr-Commit-Position: refs/heads/master@{#686627}

chromecast/media/cma/backend/android/java/src/org/chromium/chromecast/cma/backend/android/AudioSinkAudioTrackImpl.java

@@ -135,7 +135,7 @@ class AudioSinkAudioTrackImpl {
     private static final long MAX_TIME_IGNORING_TSTAMPS_NSECS = SEC_IN_NSEC;
 
     // Additional padding for minimum buffer time, determined experimentally.
-    private static final long MIN_BUFFERED_TIME_PADDING_USEC = ANDROID_AUDIO_PERIOD_SIZE_USEC;
+    private static final long MIN_BUFFERED_TIME_PADDING_USEC = 120000;
 
     private static AudioManager sAudioManager;