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
diff --git a/build/common.gypi b/build/common.gypi
index 6ae7ddcd..33a37267 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -1542,7 +1542,7 @@
           }],
         ],
       }],
-      ['OS=="mac"', {
+      ['OS=="mac" or OS=="ios"', {
         'grit_defines': ['-D', 'scale_factors=2x'],
       }],
       ['OS == "ios"', {