Rename kES2_GrGLBinding to kES_GrGLBinding. Step 0 for supporting ES3.

src/gpu/gl/GrGLInterface.cpp

Index: src/gpu/gl/GrGLInterface.cpp
diff --git a/src/gpu/gl/GrGLInterface.cpp b/src/gpu/gl/GrGLInterface.cpp
index 72d7934cbda4715424dc6d35e88454a4f2ad3a74..8f94f1002c43ba97eb13c0e5a4a472045e5d99c3 100644
--- a/src/gpu/gl/GrGLInterface.cpp
+++ b/src/gpu/gl/GrGLInterface.cpp
@@ -150,7 +150,7 @@ bool GrGLInterface::validate(GrGLBinding binding) const {
     // these functions are part of ES2, we assume they are available
     // On the desktop we assume they are available if the extension
     // is present or GL version is high enough.
-    if (kES2_GrGLBinding == binding) {
+    if (kES_GrGLBinding == binding) {
         if (NULL == fStencilFuncSeparate ||
             NULL == fStencilMaskSeparate ||
             NULL == fStencilOpSeparate) {