Enable HiDPI assets for the WebUI in iOS.

Change common.gypi to pass scale_factors=2x to grit on iOS.

BUG=262913
TEST=WebUI assets show as 2x on iOS.

Review URL: https://chromiumcodereview.appspot.com/20466002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@214578 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed