[Telemetry] Attempted fix for flake observed on mac.

It seems PS may output an empty process state. Be robust against that.

Example:
http://build.chromium.org/p/chromium.perf/builders/Mac10.6%20Perf%282%29/builds/31336/steps/tab_switching.top_10/logs/stdio

BUG=

Review URL: https://codereview.chromium.org/84713003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@237271 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 237271
[Telemetry] Attempt to fix flake observed on mac.

Perhaps the shutdown timeouts were just not long enough?

See:
http://build.chromium.org/p/chromium.perf/builders/Mac10.6%20Perf%283%29/builds/36489/steps/dromaeo.domcoretraverse/logs/stdio

BUG=

Review URL: https://codereview.chromium.org/84803002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@237272 0039d316-1c4b-4281-b951-d872f2087c98
chromeos: Allow anyone to edit chromeos/chromeos.gyp

BUG=none
TEST=none

Review URL: https://codereview.chromium.org/85023005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@237273 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 237272
SVN changes up to revision 237273
Disk cache: Downgrade a DCHECK to a DLOG.

Once in a while this hits a developer after going through a system crash (or
forced restart), as expected, but the rest of the code solves the issue
without user intervention.

BUG=none
TEST=none
R=jar@chromium.org

Review URL: https://codereview.chromium.org/85643005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@237274 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 237274