[Mac] UI fixes to the new avatar bubble.

- the bottom options buttons get a blue background when hovered over
- corrected the spacing between a button's image and its title.
- s/makeAccountButtonWithRect/accountButtonWithRect/g to be 
consistent with the other control-making methods.

Screenshot: https://drive.google.com/file/d/0B1B1Up4p2NRMeERscUNleHNMWWc/edit?usp=sharing

BUG=324036

Review URL: https://codereview.chromium.org/132903016

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247910 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 247910
Make timeline model able to return browser process

When parsing tracing data into timeline model, also find the browser
process and save it into timeline model. This is to support querying
async slices starting in browser process.

BUG=246034
TEST=Run telemetry smoothness test and make sure input latency trace
     can be retrieved from querying async slices on browser process.

Review URL: https://codereview.chromium.org/144423003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247911 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 247911