Use indexed extensions on ES3.

src/gpu/gl/GrGLExtensions.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "gl/GrGLExtensions.h"
 #include "gl/GrGLDefines.h"
 #include "gl/GrGLUtil.h"
 
 #include "SkTSearch.h"
 #include "SkTSort.h"
 
 namespace {
 inline bool extension_compare(const SkString& a, const SkString& b) {
     return strcmp(a.c_str(), b.c_str()) < 0;
 }
 }
 
 bool GrGLExtensions::init(GrGLBinding binding,
                           GrGLGetStringProc getString,
                           GrGLGetStringiProc getStringi,
                           GrGLGetIntegervProc getIntegerv) {
     fStrings.reset();
     if (NULL == getString) {
         return false;
     }
-    bool indexed = false;
-    if (kDesktop_GrGLBinding == binding) {
-        const GrGLubyte* verString = getString(GR_GL_VERSION);
-        if (NULL == verString) {
-            return false;
-        }
-        GrGLVersion version = GrGLGetVersionFromString((const char*) verString);
-        indexed = version >= GR_GL_VER(3, 0);
+
+    // glGetStringi and indexed extensions were added in version 3.0 of desktop GL and ES.
+    const GrGLubyte* verString = getString(GR_GL_VERSION);
+    if (NULL == verString) {
+        return false;
     }
+    GrGLVersion version = GrGLGetVersionFromString((const char*) verString);
+    bool indexed = version >= GR_GL_VER(3, 0);
+
     if (indexed) {
         if (NULL == getStringi || NULL == getIntegerv) {
             return false;
         }
         GrGLint extensionCnt = 0;
         getIntegerv(GR_GL_NUM_EXTENSIONS, &extensionCnt);
         fStrings.push_back_n(extensionCnt);
         for (int i = 0; i < extensionCnt; ++i) {
             const char* ext = (const char*) getStringi(GR_GL_EXTENSIONS, i);
             fStrings[i] = ext;
@@ skipping 39 matching lines @@
 
 void GrGLExtensions::print(const char* sep) const {
     if (NULL == sep) {
         sep = " ";
     }
     int cnt = fStrings.count();
     for (int i = 0; i < cnt; ++i) {
         GrPrintf("%s%s", fStrings[i].c_str(), (i < cnt - 1) ? sep : "");
     }
 }