aura: Use platform independent skia::PlatformCanvas when possible.

ui/ui.gyp

Index: ui/ui.gyp
diff --git a/ui/ui.gyp b/ui/ui.gyp
index 2cb8163955b469b9cb14ae7ce6dab7394a9382cc..473751f63b7b9e49f68c68b48811f2c3865cdc45 100644
--- a/ui/ui.gyp
+++ b/ui/ui.gyp
@@ -373,14 +373,14 @@
       'conditions': [
         # TODO(asvitkine): Switch all platforms to use canvas_skia.cc.
         #                  http://crbug.com/105550
-        ['use_canvas_skia==1', {
+        ['use_canvas_skia==1 or use_aura==1', {

[piman, 2012/03/21 16:54:19]

I think it would be more maintainable to set use_canvas_skia in common.gypi
under the use_aura==1 condition.

[Alexei Svitkine (slow), 2012/03/21 16:59:20]

Actually, I agree on this front. Was a little trigger-happy on the LGTM.

Also, maybe make it a separate change to turn use_canvas_skia=1 on by default
for aura.

           'sources!': [
             'gfx/canvas_android.cc',
             'gfx/canvas_linux.cc',
             'gfx/canvas_mac.mm',
             'gfx/canvas_win.cc',
           ],
-        }, {  # use_canvas_skia!=1
+        }, {  # use_canvas_skia!=1 and use_aura!=1
           'sources!': [
             'gfx/canvas_skia.cc',
           ],