Turn on canvas_skia for OSX

build/common.gypi

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   # Variables expected to be overriden on the GYP command line (-D) or by
   # ~/.gyp/include.gypi.
@@ skipping 637 matching lines @@
           'enable_captive_portal_detection%': 0,
         }, {
           'enable_captive_portal_detection%': 1,
         }],
 
         # Enable Skia UI text drawing incrementally on different platforms.
         # http://crbug.com/105550
         #
         # On Aura, this allows per-tile painting to be used in the browser
         # compositor.
-        ['OS!="mac" and OS!="android"', {
+        ['OS!="android"', {
           'use_canvas_skia%': 1,
         }],
 
         ['chromeos==1', {
           # When building for ChromeOS we dont want Chromium to use libjpeg_turbo.
           'use_libjpeg_turbo%': 0,
         }],
 
         ['OS=="android"', {
           # When building as part of the Android system, use system libraries
@@ skipping 4056 matching lines @@
     # settings in target dicts.  SYMROOT is a special case, because many other
     # Xcode variables depend on it, including variables such as
     # PROJECT_DERIVED_FILE_DIR.  When a source group corresponding to something
     # like PROJECT_DERIVED_FILE_DIR is added to a project, in order for the
     # files to appear (when present) in the UI as actual files and not red
     # red "missing file" proxies, the correct path to PROJECT_DERIVED_FILE_DIR,
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }