[Mojo] Remove dependency between mojo/public and gpu

mojo/examples/sample_app/sample_gles2_delegate.cc

-// Copyright 2013 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 "mojo/examples/sample_app/sample_gles2_delegate.h"
-
-#include <stdio.h>
-#include <GLES2/gl2.h>
-#include <GLES2/gl2ext.h>
-
-namespace mojo {
-namespace examples {
-
-SampleGLES2Delegate::SampleGLES2Delegate()
-    : gl_(NULL) {
-}
-
-SampleGLES2Delegate::~SampleGLES2Delegate() {
-}
-
-void SampleGLES2Delegate::DidCreateContext(
-    GLES2ClientImpl* gl, uint32_t width, uint32_t height) {
-  gl_ = gl;
-  cube_.Init(width, height);
-  last_time_ = base::Time::Now();
-  timer_.Start(FROM_HERE, base::TimeDelta::FromMilliseconds(16),
-               this, &SampleGLES2Delegate::Draw);
-}
-
-void SampleGLES2Delegate::Draw() {
-  base::Time now = base::Time::Now();
-  base::TimeDelta offset = now - last_time_;
-  last_time_ = now;
-  cube_.Update(offset.InSecondsF());
-  cube_.Draw();
-  gl_->SwapBuffers();
-}
-
-void SampleGLES2Delegate::ContextLost(GLES2ClientImpl* gl) {
-  gl_ = NULL;
-  timer_.Stop();
-}
-
-}  // namespace examples
-}  // namespace mojo