[Mojo] Remove dependency between mojo/public and gpu

mojo/gles2/gles2.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/public/gles2/gles2.h"
+
+#include "gpu/command_buffer/client/gles2_lib.h"
+
+extern "C" {
+
+void MojoGLES2Initialize() {
+  gles2::Initialize();
+}
+
+void MojoGLES2Terminate() {
+  gles2::Terminate();
+}
+
+void MojoGLES2MakeCurrent(uint64_t encoded) {
+  // Ack, Hans! It's the giant hack.
+  // TODO(abarth): Replace this hack with something more disciplined. Most
+  // likley, we should receive a MojoHandle that we use to wire up the
+  // client side of an out-of-process command buffer. Given that we're
+  // still in-process, we just reinterpret_cast the value into a GL interface.
+  gpu::gles2::GLES2Interface* gl_interface =
+      reinterpret_cast<gpu::gles2::GLES2Interface*>(
+          static_cast<uintptr_t>(encoded));
+  gles2::SetGLContext(gl_interface);
+}
+
+void MojoGLES2SwapBuffers() {
+  gles2::GetGLContext()->SwapBuffers();
+}
+
+}  // extern "C"