Fix Sample App on Win32 GL window resize, fix sk->gr convexity hint, fix grpath uninit warnings

Review URL http://codereview.appspot.com/4247055/


git-svn-id: http://skia.googlecode.com/svn/trunk@895 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gpu/include/GrPathIter.h b/gpu/include/GrPathIter.h
index f310184..55427c0 100644
--- a/gpu/include/GrPathIter.h
+++ b/gpu/include/GrPathIter.h
@@ -50,7 +50,7 @@
      *
      * @return a hint about the convexity of the path.
      */
-    virtual GrConvexHint convexHint() const { return kNone_ConvexHint; }
+    virtual GrConvexHint convexHint() const = 0;
 
      /**
       * Iterates through the path. Should not be called after