linux_aura: Use GTK button borders in GTK theme mode.

Up until recently, the icons for back/forward/home/reload all used
borders drawn on the image resources. Then this was changed to use a
views::Border to draw on top of the icon. Gtk2UI wasn't similarly
changed. This patch adds a Gtk2Border, along with machinery for having
the views::LinuxUI vend instances of them to the views layer.

This border should theoretically be usable for other buttons, like the
bookmark buttons, which are still using the chrome theme resources even
in GTK theme mode.

BUG=333404

Review URL: https://codereview.chromium.org/131513005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246444 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 246444
Remove a fixed unitialized read

This was fixed by
http://src.chromium.org/viewvc/blink?view=rev&rev=165165

BUG=333564
NOTRY=true

Review URL: https://codereview.chromium.org/134643023

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246445 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 246445
Add Windows Flash hw video decode trial.

This is to support the Windows rollout of the feature.

The distribution on different channels will be controlled from the
server. Initially we will target 100% on canary/dev, 50% on beta and
starting slowly (say from 1%) on stable but this will be gradual and
is subject to approval.

Also remove low latency audio trail which has expired a long time ago.
(It also is hard wired to enabled in all Flash binaries.)

BUG=chromium:335836
TEST=Verified Flash flags are properly passed on Link.

Review URL: https://codereview.chromium.org/141753006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246446 0039d316-1c4b-4281-b951-d872f2087c98
[PPAPI] Add MediaStream Video NaCl exanmple in native_client_sdk

BUG=330851

Review URL: https://codereview.chromium.org/141863003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246447 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 246446
SVN changes up to revision 246447