Rename kES2_GrGLBinding to kES_GrGLBinding. Step 0 for supporting ES3.

src/gpu/gl/GrGLShaderVar.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrGLShaderVar_DEFINED
 #define GrGLShaderVar_DEFINED
 
@@ skipping 286 matching lines @@
 
     void appendArrayAccess(const char* indexName, SkString* out) const {
         out->appendf("%s[%s]%s",
                      this->getName().c_str(),
                      indexName,
                      fUseUniformFloatArrays ? "" : ".x");
     }
 
     static const char* PrecisionString(Precision p, GrGLBinding binding) {
         // Desktop GLSL has added precision qualifiers but they don't do anything.
-        if (kES2_GrGLBinding == binding) {
+        if (kES_GrGLBinding == binding) {
             switch (p) {
                 case kLow_Precision:
                     return "lowp ";
                 case kMedium_Precision:
                     return "mediump ";
                 case kHigh_Precision:
                     return "highp ";
                 case kDefault_Precision:
                     return "";
                 default:
@@ skipping 33 matching lines @@
     SkString        fName;
     int             fCount;
     Precision       fPrecision;
     Origin          fOrigin;
     /// Work around driver bugs on some hardware that don't correctly
     /// support uniform float []
     bool            fUseUniformFloatArrays;
 };
 
 #endif