stagefright: Add warning log in MPEG4Writer.

This will greatly help debug the problem when MPEG4Writer exit silently.

Bug: 26525150
Change-Id: Id1e356277fdbbf009d5020b29117a5472a7e0ae4
diff --git a/media/libstagefright/MPEG4Writer.cpp b/media/libstagefright/MPEG4Writer.cpp
index d520cb3..ef0e17f 100644
--- a/media/libstagefright/MPEG4Writer.cpp
+++ b/media/libstagefright/MPEG4Writer.cpp
@@ -2404,10 +2404,14 @@
         updateTrackSizeEstimate();
 
         if (mOwner->exceedsFileSizeLimit()) {
+            ALOGW("Recorded file size exceeds limit %" PRId64 "bytes",
+                    mOwner->mMaxFileSizeLimitBytes);
             mOwner->notify(MEDIA_RECORDER_EVENT_INFO, MEDIA_RECORDER_INFO_MAX_FILESIZE_REACHED, 0);
             break;
         }
         if (mOwner->exceedsFileDurationLimit()) {
+            ALOGW("Recorded file duration exceeds limit %" PRId64 "microseconds",
+                    mOwner->mMaxFileDurationLimitUs);
             mOwner->notify(MEDIA_RECORDER_EVENT_INFO, MEDIA_RECORDER_INFO_MAX_DURATION_REACHED, 0);
             break;
         }