The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/f97f7538cc5be6da3145a830ff1a786f6c0bbf78

commit f97f7538cc5be6da3145a830ff1a786f6c0bbf78
Author: shaktisahu <shaktisahu@chromium.org>
Date: Fri Feb 24 22:46:13 2017

Enabling autoplay and fullscreen for downloaded media

For downloaded video, the desired behavior is to autoplay with fullscreen
 at the start. This CL enables the video to enter
fullscreen by adding an event listener for onloadedmetadata. A web
preference was added for triggering this feature.

BUG= 682848 

Review-Url: https://codereview.chromium.org/2640023008
Cr-Commit-Position: refs/heads/master@{#452967}

[modify] https://crrev.com/f97f7538cc5be6da3145a830ff1a786f6c0bbf78/chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabActivity.java
[modify] https://crrev.com/f97f7538cc5be6da3145a830ff1a786f6c0bbf78/chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabIntentDataProvider.java
[modify] https://crrev.com/f97f7538cc5be6da3145a830ff1a786f6c0bbf78/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadUtils.java
[modify] https://crrev.com/f97f7538cc5be6da3145a830ff1a786f6c0bbf78/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
[modify] https://crrev.com/f97f7538cc5be6da3145a830ff1a786f6c0bbf78/chrome/browser/android/tab_android.cc
[modify] https://crrev.com/f97f7538cc5be6da3145a830ff1a786f6c0bbf78/chrome/browser/android/tab_android.h
[modify] https://crrev.com/f97f7538cc5be6da3145a830ff1a786f6c0bbf78/chrome/browser/chrome_content_browser_client.cc
[modify] https://crrev.com/f97f7538cc5be6da3145a830ff1a786f6c0bbf78/content/public/common/common_param_traits_macros.h
[modify] https://crrev.com/f97f7538cc5be6da3145a830ff1a786f6c0bbf78/content/public/common/web_preferences.cc
[modify] https://crrev.com/f97f7538cc5be6da3145a830ff1a786f6c0bbf78/content/public/common/web_preferences.h
[modify] https://crrev.com/f97f7538cc5be6da3145a830ff1a786f6c0bbf78/content/renderer/render_view_impl.cc
[modify] https://crrev.com/f97f7538cc5be6da3145a830ff1a786f6c0bbf78/third_party/WebKit/Source/core/frame/Settings.json5
[modify] https://crrev.com/f97f7538cc5be6da3145a830ff1a786f6c0bbf78/third_party/WebKit/Source/core/html/MediaDocument.cpp
[modify] https://crrev.com/f97f7538cc5be6da3145a830ff1a786f6c0bbf78/third_party/WebKit/Source/web/WebSettingsImpl.cpp
[modify] https://crrev.com/f97f7538cc5be6da3145a830ff1a786f6c0bbf78/third_party/WebKit/Source/web/WebSettingsImpl.h
[modify] https://crrev.com/f97f7538cc5be6da3145a830ff1a786f6c0bbf78/third_party/WebKit/public/web/WebSettings.h