[Mojo] Remove dependency between mojo/public and gpu

mojo/examples/sample_app/gles2_client_impl.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/gles2_client_impl.h"
+
+#include <GLES2/gl2.h>
+#include <GLES2/gl2ext.h>
+
+#include "mojo/public/gles2/gles2.h"
+
+namespace mojo {
+namespace examples {
+
+GLES2ClientImpl::GLES2ClientImpl(ScopedMessagePipeHandle pipe)
+    : service_(pipe.Pass()) {
+  service_.SetPeer(this);
+}
+
+GLES2ClientImpl::~GLES2ClientImpl() {
+  service_->Destroy();
+}
+
+void GLES2ClientImpl::DidCreateContext(uint64_t encoded,
+                                       uint32_t width,
+                                       uint32_t height) {
+  MojoGLES2MakeCurrent(encoded);
+
+  cube_.Init(width, height);
+  last_time_ = base::Time::Now();
+  timer_.Start(FROM_HERE, base::TimeDelta::FromMilliseconds(16),
+               this, &GLES2ClientImpl::Draw);
+}
+
+void GLES2ClientImpl::Draw() {
+  base::Time now = base::Time::Now();
+  base::TimeDelta offset = now - last_time_;
+  last_time_ = now;
+  cube_.Update(offset.InSecondsF());
+  cube_.Draw();
+
+  MojoGLES2SwapBuffers();
+}
+
+void GLES2ClientImpl::ContextLost() {
+  timer_.Stop();
+}
+
+}  // namespace examples
+}  // namespace mojo