Implement support for rendering to 32-bit float textures on ES3

ui/gl/gl_context_stub.cc

 // Copyright (c) 2012 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/gl/gl_context_stub.h"
 
 namespace gfx {
 
 GLContextStub::GLContextStub() : GLContextReal(NULL) {}
 
@@ skipping 21 matching lines @@
   return NULL;
 }
 
 void GLContextStub::SetSwapInterval(int interval) {
 }
 
 std::string GLContextStub::GetExtensions() {
   return std::string();
 }
 
+std::string GLContextStub::GetGLRenderer() {
+  return std::string("CHROMIUM");
+}
+
 GLContextStub::~GLContextStub() {}
 
 }  // namespace gfx