Make OSMesa GL implementation advertise supported functionality as ES2 extensions

ui/gfx/gl/gl_implementation.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/gfx/gl/gl_implementation.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/at_exit.h"
@@ skipping 88 matching lines @@
 }
 
 void SetGLImplementation(GLImplementation implementation) {
   g_gl_implementation = implementation;
 }
 
 GLImplementation GetGLImplementation() {
   return g_gl_implementation;
 }
 
+bool HasDesktopGLFeatures() {
+  return kGLImplementationDesktopGL == g_gl_implementation ||
+         kGLImplementationOSMesaGL == g_gl_implementation;
+}
+
 void AddGLNativeLibrary(base::NativeLibrary library) {
   DCHECK(library);
 
   if (!g_libraries) {
     g_libraries = new LibraryArray;
     base::AtExitManager::RegisterCallback(CleanupNativeLibraries, NULL);
   }
 
   g_libraries->push_back(library);
 }
@@ skipping 18 matching lines @@
   if (g_get_proc_address) {
     void* proc = g_get_proc_address(name);
     if (proc)
       return proc;
   }
 
   return NULL;
 }
 
 }  // namespace gfx