Teach SkyShell how to draw with Ganesh

sky/shell/gpu_driver.cc

-// Copyright 2015 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 "sky/shell/gpu_driver.h"
-
-#include "ui/gl/gl_bindings.h"
-#include "ui/gl/gl_context.h"
-#include "ui/gl/gl_share_group.h"
-#include "ui/gl/gl_surface.h"
-
-namespace sky {
-namespace shell {
-
-GPUDriver::GPUDriver() : weak_factory_(this) {
-}
-
-GPUDriver::~GPUDriver() {
-}
-
-base::WeakPtr<GPUDriver> GPUDriver::GetWeakPtr() {
-  return weak_factory_.GetWeakPtr();
-}
-
-void GPUDriver::Init(gfx::AcceleratedWidget widget) {
-  share_group_ = make_scoped_refptr(new gfx::GLShareGroup());
-
-  surface_ = gfx::GLSurface::CreateViewGLSurface(widget);
-  CHECK(surface_) << "GLSurface required.";
-
-  context_ = gfx::GLContext::CreateGLContext(share_group_.get(), surface_.get(),
-                                             gfx::PreferIntegratedGpu);
-  CHECK(context_) << "GLContext required.";
-
-  CHECK(context_->MakeCurrent(surface_.get()));
-
-  glClearColor(0.0, 1.0, 0.0, 0.0);
-  glClear(GL_COLOR_BUFFER_BIT);
-
-  surface_->SwapBuffers();
-}
-
-}  // namespace shell
-}  // namespace sky