headless: Initial headless embedder API implementation

headless/lib/browser/headless_screen.h

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Copyright 2016 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.
 
-#ifndef UI_AURA_TEST_TEST_SCREEN_H_
-#define UI_AURA_TEST_TEST_SCREEN_H_
+#ifndef HEADLESS_LIB_BROWSER_HEADLESS_SCREEN_H_
+#define HEADLESS_LIB_BROWSER_HEADLESS_SCREEN_H_
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "ui/aura/window_observer.h"
 #include "ui/gfx/display.h"
 #include "ui/gfx/screen.h"
 
 namespace gfx {
 class Insets;
 class Rect;
 class Transform;
 }
 
 namespace aura {
 class Window;
 class WindowTreeHost;
+}
 
-// A minimal, testing Aura implementation of gfx::Screen.
-// TODO(bruthig): Consider extending gfx::test::TestScreen.
-class TestScreen : public gfx::Screen,
-                   public WindowObserver {
+namespace headless {
+
+class HeadlessScreen : public gfx::Screen, public aura::WindowObserver {
  public:
   // Creates a gfx::Screen of the specified size. If no size is specified, then
   // creates a 800x600 screen. |size| is in physical pixels.
-  static TestScreen* Create(const gfx::Size& size);
-  ~TestScreen() override;
+  static HeadlessScreen* Create(const gfx::Size& size);
+  ~HeadlessScreen() override;
 
-  WindowTreeHost* CreateHostForPrimaryDisplay();
+  aura::WindowTreeHost* CreateHostForPrimaryDisplay();
 
   void SetDeviceScaleFactor(float device_scale_fator);
   void SetDisplayRotation(gfx::Display::Rotation rotation);
   void SetUIScale(float ui_scale);
   void SetWorkAreaInsets(const gfx::Insets& insets);
 
  protected:
   gfx::Transform GetRotationTransform() const;
   gfx::Transform GetUIScaleTransform() const;
 
   // WindowObserver overrides:
-  void OnWindowBoundsChanged(Window* window,
+  void OnWindowBoundsChanged(aura::Window* window,
                              const gfx::Rect& old_bounds,
                              const gfx::Rect& new_bounds) override;
-  void OnWindowDestroying(Window* window) override;
+  void OnWindowDestroying(aura::Window* window) override;
 
   // gfx::Screen overrides:
   gfx::Point GetCursorScreenPoint() override;
   gfx::NativeWindow GetWindowUnderCursor() override;
   gfx::NativeWindow GetWindowAtScreenPoint(const gfx::Point& point) override;
   int GetNumDisplays() const override;
   std::vector<gfx::Display> GetAllDisplays() const override;
   gfx::Display GetDisplayNearestWindow(gfx::NativeView view) const override;
   gfx::Display GetDisplayNearestPoint(const gfx::Point& point) const override;
   gfx::Display GetDisplayMatching(const gfx::Rect& match_rect) const override;
   gfx::Display GetPrimaryDisplay() const override;
   void AddObserver(gfx::DisplayObserver* observer) override;
   void RemoveObserver(gfx::DisplayObserver* observer) override;
 
  private:
-  explicit TestScreen(const gfx::Rect& screen_bounds);
+  explicit HeadlessScreen(const gfx::Rect& screen_bounds);
 
   aura::WindowTreeHost* host_;
-
   gfx::Display display_;
-
   float ui_scale_;
 
-  DISALLOW_COPY_AND_ASSIGN(TestScreen);
+  DISALLOW_COPY_AND_ASSIGN(HeadlessScreen);
 };
 
-}  // namespace aura
+}  // namespace headless
 
-#endif  // UI_AURA_TEST_TEST_SCREEN_H_
+#endif  // HEADLESS_LIB_BROWSER_HEADLESS_SCREEN_H_