Compile ACCELERATED_COMPOSITING and 3D CSS transform code by default on windows. Other platforms

will still require the use_accelerated_compositing=1 GYP define.
BUG=46085

Review URL: http://codereview.chromium.org/2764003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@49697 0039d316-1c4b-4281-b951-d872f2087c98

build/features_override.gypi

@@ -56,7 +56,7 @@
     'enable_svg%': '<(enable_svg)',
     'enable_touch_events%': '<(enable_touch_events)',
     'conditions': [
-      ['use_accelerated_compositing==1', {
+      ['OS=="win" or use_accelerated_compositing==1', {
         'feature_defines': [
          'WTF_USE_ACCELERATED_COMPOSITING=1',
          'ENABLE_3D_RENDERING=1',