Reland a portion of r215672.

gpu/demos/gles2_book/demo_hello_triangle.cc

-// Copyright (c) 2010 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.
-
-// This is a simple example that draws a single triangle with
-// a minimal vertex/fragment shader.  The purpose of this
-// example is to demonstrate the basic concepts of
-// OpenGL ES 2.0 rendering.
-
-#include "gpu/demos/framework/demo_factory.h"
-#include "gpu/demos/gles2_book/example.h"
-#include "third_party/gles2_book/Chapter_2/Hello_Triangle/Hello_Triangle.h"
-
-namespace gpu {
-namespace demos {
-
-namespace gles2_book {
-class HelloTriangle : public Example<HTUserData> {
- public:
-  HelloTriangle() {
-    RegisterCallbacks(htInit, NULL, htDraw, htShutDown);
-  }
-
-  const wchar_t* Title() const {
-    return L"Hello Triangle";
-  }
-};
-}  // namespace gles2_book
-
-Demo* CreateDemo() {
-  return new gles2_book::HelloTriangle();
-}
-
-}  // namespace demos
-}  // namespace gpu