Add two pixel-based compositor unittests.

ui/gfx/compositor/test_compositor_host_win.cc

-// Copyright (c) 2011 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 "ui/gfx/compositor/test_compositor_host.h"
-
-#include "base/compiler_specific.h"
-#include "ui/base/win/window_impl.h"
-#include "ui/gfx/compositor/compositor.h"
-
-namespace ui {
-
-class TestCompositorHostWin : public TestCompositorHost,
-                              public WindowImpl,
-                              public CompositorDelegate {
- public:
-  TestCompositorHostWin(const gfx::Rect& bounds) {
-    Init(NULL, bounds);
-    compositor_ = ui::Compositor::Create(this, hwnd(), GetSize());
-  }
-
-  virtual ~TestCompositorHostWin() {
-    DestroyWindow(hwnd());
-  }
-
-  // Overridden from MessageLoop::Dispatcher:
-  virtual bool Dispatch(const MSG& msg) {
-    TranslateMessage(&msg);
-    DispatchMessage(&msg);
-    return true;
-  }
-
-  // Overridden from TestCompositorHost:
-  virtual void Show() OVERRIDE {
-    ShowWindow(hwnd(), SW_SHOWNORMAL);
-  }
-  virtual ui::Compositor* GetCompositor() OVERRIDE {
-    return compositor_;
-  }
-
-  // Overridden from CompositorDelegate:
-  virtual void ScheduleDraw() OVERRIDE {
-    RECT rect;
-    ::GetClientRect(hwnd(), &rect);
-    InvalidateRect(hwnd(), &rect, FALSE);
-  }
-
- private:
-  BEGIN_MSG_MAP_EX(TestCompositorHostWin)
-    MSG_WM_PAINT(OnPaint)
-  END_MSG_MAP()
-
-  void OnPaint(HDC dc) {
-    compositor_->Draw(false);
-    ValidateRect(hwnd(), NULL);
-  }
-
-  gfx::Size GetSize() {
-    RECT r;
-    GetClientRect(hwnd(), &r);
-    return gfx::Rect(r).size();
-  }
-
-  scoped_refptr<ui::Compositor> compositor_;
-
-  DISALLOW_COPY_AND_ASSIGN(TestCompositorHostWin);
-};
-
-TestCompositorHost* TestCompositorHost::Create(const gfx::Rect& bounds) {
-  return new TestCompositorHostWin(bounds);
-}
-
-}  // namespace ui