Add per-tile painting support to compositor.

ui/gfx/compositor/compositor.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 45 matching lines @@
       'conditions': [
         ['OS == "win" and use_aura == 1', {
           # TODO(sky): before we make this real need to remove
           # IDR_BITMAP_BRUSH_IMAGE.
           'dependencies': [
             '<(DEPTH)/ui/ui.gyp:gfx_resources',
             '<(DEPTH)/third_party/angle/src/build_angle.gyp:libEGL',
             '<(DEPTH)/third_party/angle/src/build_angle.gyp:libGLESv2',
           ],
         }],
+        ['use_canvas_skia_skia==1', {
+            'defines': [
+              'PER_TILE_PAINTING',
+          ],
+        }],
       ],
     },
     {
       'target_name': 'compositor_test_support',
       'type': 'static_library',
       'dependencies': [
         '<(DEPTH)/base/base.gyp:base',
         '<(DEPTH)/webkit/support/webkit_support.gyp:webkit_support',
         '<(DEPTH)/third_party/WebKit/Source/WebKit/chromium/WebKit.gyp:webkit',
       ],
@@ skipping 51 matching lines @@
         # osmesa GL implementation is used on linux.
         ['OS=="linux"', {
           'dependencies': [
             '<(DEPTH)/third_party/mesa/mesa.gyp:osmesa',
           ],
         }],
       ],
     },
   ],
 }