Add HiDPI flag for Windows.

The flag is currently disabled by default.

BUG=243445

Review URL: https://chromiumcodereview.appspot.com/16196008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@204939 0039d316-1c4b-4281-b951-d872f2087c98
5 files changed