[Telemetry] Support download profiles from cloud storage

Needed for theme and many extension startup tests.

* Add benchmarks/startup_with_extensions.py - new theme and many_profile startup tests.
* Teach test.py to use .sha1 files for profile directories, these are downloaded from cloud storage, unzipped and then used as the profile directory by the browser.
* Add a function to browser_finder to allow querying the target OS.

BUG=None

Review URL: https://codereview.chromium.org/124733002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243543 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 243543
Update managed icon in CrOS proxy settings dialog.

This one got left out of the mass icon switch.

BUG=323658

Review URL: https://codereview.chromium.org/125853003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243544 0039d316-1c4b-4281-b951-d872f2087c98
Revert "cc: Simplify raster task completion notification logic"

This CL causes Chrome to freeze on e.g. jsfiddle.net/r8dx9/1/embedded/result
See crbug.com/331534 for details.

> cc: Simplify raster task completion notification logic
>
> Previously the pixel buffer raster worker pool used a combination of
> polling and explicit notifications from the raster worker pool to decide
> when to tell the client about the completion of 1) all tasks or 2) the
> subset of tasks required for activation. This patch simplifies the logic
> by only triggering the notification based on the OnRasterTasksFinished
> and OnRasterTasksRequiredForActivationFinished calls from the worker
> pool.
>
> BUG=307841
>
> Review URL: https://codereview.chromium.org/99873007

R=reveman@chromium.org,skyostil@chromium.org
BUG=331534

Review URL: https://codereview.chromium.org/126143006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243545 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 243545
Roll Skia DEPS to r12947

R=rmistry@google.com

Review URL: https://codereview.chromium.org/110413009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243546 0039d316-1c4b-4281-b951-d872f2087c98
Update .DEPS.git

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243547 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 243547