[Telemetry] Add ability to do dummynet network simulation via --netsim.

For example:
$ tools/perf/run_benchmark page_cycler.typical_25 --netsim=3g

BUG=

Review URL: https://codereview.chromium.org/66903004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@235573 0039d316-1c4b-4281-b951-d872f2087c98
Re-add sandbox warmup to ExynosVideoDecodeAccelerator.

Fixes sandboxing failure on GPU process on Chrome startup.

BUG=167417
BUG=319952
TEST=local build, run on CrOS daisy, daisy-spring

Review URL: https://codereview.chromium.org/68593003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@235574 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 235573
SVN changes up to revision 235574
Hard-code MaxTouchPoints for ozone to be 11

BUG=312926
TEST=None.

Review URL: https://codereview.chromium.org/66993009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@235575 0039d316-1c4b-4281-b951-d872f2087c98
Fixed the graphdeps.py docs.

BUG=292397

Updated the graphdeps.py docs.

BUG=292397
TBR=joi@chromium.org

Review URL: https://codereview.chromium.org/67283008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@235576 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 235576