temporary kES2_GrGLBinding alias to unblock DEPS roll

git-svn-id: http://skia.googlecode.com/svn/trunk/include@10749 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gpu/gl/GrGLInterface.h b/gpu/gl/GrGLInterface.h
index c58c5bc..852b4bd 100644
--- a/gpu/gl/GrGLInterface.h
+++ b/gpu/gl/GrGLInterface.h
@@ -30,6 +30,9 @@
     kLastGrGLBinding = kES_GrGLBinding
 };
 
+// Temporary alias until Chromium can be updated.
+static const GrGLBinding kES2_GrGLBinding = kES_GrGLBinding;
+
 ////////////////////////////////////////////////////////////////////////////////
 
 /**