Implementation of brand-color

Add APIs
- WebFrame::brandColor() to get the brand color.
- WebFrameClinet::didChangeBrandColor to notify the brand color change.

BUG=383941

Intent to implement and ship link
https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/nzRY-h_-_ig

Review URL: https://codereview.chromium.org/329943004

git-svn-id: svn://svn.chromium.org/blink/trunk@176142 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Layout overflow from transforms should update frame scrollbars

This CL implements frame scrollbar update for the overflow recalc fast path
without invoking layout. This fast path first determines whether scrollbars
need to be created or removed (in that case, a layout will be needed), and
update scrollbars without layout if possible.

TEST=fast/transforms/transform-update-frame-overflow.html
BUG=354167

Review URL: https://codereview.chromium.org/328023002

git-svn-id: svn://svn.chromium.org/blink/trunk@176143 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Revert of Disable the HTMLVideoElement-specific prefixed fullscreen API (2nd attempt) (https://codereview.chromium.org/251873002/)

Reason for revert:
Wait with removal until the unprefixed Fullscreen API has been shipped.

Original issue's description:
> Disable the HTMLVideoElement-specific prefixed fullscreen API (2nd attempt)
> 
> BUG=346236
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=172693

Review URL: https://codereview.chromium.org/328303003

git-svn-id: svn://svn.chromium.org/blink/trunk@176144 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Speed up slow tests by reducing RSA modulus size (from 2048 --> 512).

BUG=384565,245025

Review URL: https://codereview.chromium.org/333063004

git-svn-id: svn://svn.chromium.org/blink/trunk@176145 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Fix rebaseline-o-matic logging

readline blocks, so reading stdout, then stderr doesn't make any
sense because we'll block on each on. So if we print only to one
of them, we'll just wait until the process completes.

Also, simplify the readline loop in RebaselineOMatic to just
use readline instead of poll. That way it avoids missing any
output between the last poll and when the process finishes.

Review URL: https://codereview.chromium.org/329873005

git-svn-id: svn://svn.chromium.org/blink/trunk@176146 bbb929c8-8fbe-4397-9dbb-9b2b20218538