GitLab

We can now get the real screen resolution which makes
choosing tile size easier. This also uses 384 for FHD
resolutions (uses less CPU on GPU/CC threads) and adjusts
the tile size some certain screen resolutions just barely
straddle an extra tile.

BUG=329439

Review URL: https://codereview.chromium.org/119763002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244048 0039d316-1c4b-4281-b951-d872f2087c98