Put this bug in radar and address it later when the API is stable.

Does this still applies?

Yes :)

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/e125f89dbe38c925a96cbc905dcd18b7f31deb20

commit e125f89dbe38c925a96cbc905dcd18b7f31deb20
Author: zqzhang <zqzhang@chromium.org>
Date: Fri Nov 11 22:35:18 2016

Print console warnings when MediaSession message is dirty

BUG= 625244 
TEST=MANUAL

Review-Url: https://codereview.chromium.org/2492823003
Cr-Commit-Position: refs/heads/master@{#431673}

[modify] https://crrev.com/e125f89dbe38c925a96cbc905dcd18b7f31deb20/third_party/WebKit/Source/modules/mediasession/MediaImage.cpp
[modify] https://crrev.com/e125f89dbe38c925a96cbc905dcd18b7f31deb20/third_party/WebKit/Source/modules/mediasession/MediaMetadataSanitizer.cpp
[modify] https://crrev.com/e125f89dbe38c925a96cbc905dcd18b7f31deb20/third_party/WebKit/Source/modules/mediasession/MediaMetadataSanitizer.h
[modify] https://crrev.com/e125f89dbe38c925a96cbc905dcd18b7f31deb20/third_party/WebKit/Source/modules/mediasession/MediaSession.cpp