[Telemetry]: Enable telemetry to skip the zlib Octane benchmark on low memory devices.

This change also introduces a GetSystemTotalPhysicalMemory function to the
platform backend to enable querying on the devices available physical memory.

BUG=321039

Review URL: https://codereview.chromium.org/153733004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@249202 0039d316-1c4b-4281-b951-d872f2087c98
cc: Remove page scale layer tree perf test

This test was intended to help investigate perf around having too many
tiles and tilings during a pinch zoom.  However, this test has pretty
much always been flaky and noisy and has never been good for that
purpose.  It is not on the bots and causes confusion to people locally,
and so I think it should be removed.

I think its original purpose will also soon be outdated as we change the
way we create tiles and tilings as part of the prioritization rework.

BUG=none

Review URL: https://codereview.chromium.org/153283002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@249203 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 249202
Revamp Error Console UI

This change simplifies the UI displayed on the main extensions page, and moves
most of the information to the error overlay.

Images:
  before: http://imgur.com/a/qP5z0#0
  after:  http://imgur.com/a/JIdHq#0


BUG=21734

Review URL: https://codereview.chromium.org/130903008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@249204 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 249203
Do not consider drag capture window activatable for window selection.

This prevents the drag capture window from being included in overview mode.

BUG=325221
TEST=WindowSelectorTest.DragDropInProgress, RootWindowTest.CaptureWindow*
TEST=Select some text or an image and drag it to begin a drag and drop action. Then press F5. There should be no extra "blank" window in overview.

Review URL: https://codereview.chromium.org/144363014

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@249205 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 249205