Map webkit glue when Mac build uses Skia.

webkit/glue/webthemeengine_impl_mac.cc

Index: webkit/glue/webthemeengine_impl_mac.cc
===================================================================
--- webkit/glue/webthemeengine_impl_mac.cc	(revision 85477)
+++ webkit/glue/webthemeengine_impl_mac.cc	(working copy)
@@ -9,6 +9,10 @@
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebCanvas.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebRect.h"
 
+#if WEBKIT_USING_SKIA
+#include "skia/ext/skia_utils_mac.h"
+#endif
+
 using WebKit::WebCanvas;
 using WebKit::WebRect;
 using WebKit::WebThemeEngine;
@@ -52,7 +56,13 @@
   trackInfo.trackInfo.scrollbar.pressState =
       state == WebThemeEngine::StatePressed ? kThemeThumbPressed : 0;
   trackInfo.attributes |= (kThemeTrackShowThumb | kThemeTrackHideTrack);
-  HIThemeDrawTrack(&trackInfo, 0, canvas, kHIThemeOrientationNormal);
+#if WEBKIT_USING_SKIA
+  gfx::SkiaBitLocker bitLocker(canvas);
+  CGContextRef cgContext = bitLocker.cgContext();
+#else
+  CGContextRef cgContext = canvas;
+#endif
+  HIThemeDrawTrack(&trackInfo, 0, cgContext, kHIThemeOrientationNormal);
 }
 
 }  // namespace webkit_glue