commit df5e915f2075aa324e59087cfca9848b6ff3f58a
author zqzhang <zqzhang@chromium.org> Mon Jul 18 15:20:31 2016
committer Commit bot <commit-bot@chromium.org> Mon Jul 18 15:23:26 2016
tree 1a005ba0a36174076d9027b624908413880ae6dc
parent fe66a859b6dbec85510b6242dd65b73a910d2030

Using wrapWeakPersistent for VisibilityCallback in HTMLMediaElement

This is a test patch that fixes a memory leak caused by the reference between
HTMLMediaElement and ElementVisibilityObserver.

The previous patch breaks the reference cycle but seems doesn't fix the leak.
Using WeakPersistent is a workaround, but seems does not fix the leak entirely.
Keeping https://crbug.com/627539 open to keep track of the remaining leaks.

BUG=628367,627539

Review-Url: https://codereview.chromium.org/2151243002
Cr-Commit-Position: refs/heads/master@{#405996}