Code:  bool MockContentSettingsClient::allowAutoplay(bool default_value) {
  return default_value || flags_->autoplay_allowed();
 }

Vulnerability Type: DoS Overflow 
CWE ID: CWE-119
Summary: The SkBitmap::ReadRawPixels function in core/SkBitmap.cpp in the filters implementation in Skia, as used in Google Chrome before 41.0.2272.76, allows remote attackers to cause a denial of service or possibly have unspecified other impact via vectors that trigger an out-of-bounds write operation.
Commit Message: [Blink>Media] Allow autoplay muted on Android by default

There was a mistake causing autoplay muted is shipped on Android
but it will be disabled if the chromium embedder doesn't specify
content setting for "AllowAutoplay" preference. This CL makes the
AllowAutoplay preference true by default so that it is allowed by
embedders (including AndroidWebView) unless they explicitly
disable it.

Intent to ship:
https://groups.google.com/a/chromium.org/d/msg/blink-dev/Q1cnzNI2GpI/AL_eyUNABgAJ

BUG=689018

Review-Url: https://codereview.chromium.org/2677173002
Cr-Commit-Position: refs/heads/master@{#448423}