Per-draw super sampling. Disabled, path only, 2x2 only

Review URL: http://codereview.appspot.com/4452048/



git-svn-id: http://skia.googlecode.com/svn/trunk@1186 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gpu/include/GrPathRenderer.h b/gpu/include/GrPathRenderer.h
index 91d9086..03092b6 100644
--- a/gpu/include/GrPathRenderer.h
+++ b/gpu/include/GrPathRenderer.h
@@ -109,6 +109,12 @@
     }
     
     /**
+     * @return true if the path renderer can perform anti-aliasing (aside from
+     * having FSAA enabled for a render target)
+     */
+    virtual bool supportsAA() { return false; }
+
+    /**
      * This is called to install a custom path renderer in every GrContext at
      * create time. The default implementation in GrCreatePathRenderer_none.cpp
      * returns NULL. Link against another implementation to install your own.