First crack at implementing the touch explaration mode.

ash/touch/touch_exploration_controller.h

+// Copyright 2014 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 ASH_TOUCH_TOUCH_EXPLORATION_CONTROLLER_H_
+#define ASH_TOUCH_TOUCH_EXPLORATION_CONTROLLER_H_
+
+#include "ash/ash_export.h"
+#include "ash/display/display_controller.h"
+#include "base/values.h"
+#include "ui/aura/window.h"
+#include "ui/events/event.h"
+#include "ui/events/event_handler.h"
+
+namespace ash {
+namespace internal {
+
+// TODO: How much screen/display logic (DisplayController::Observer,

[mfomitchev, 2014/04/11 21:00:58]

Bunch of questions in TODOs here.

[sadrul, 2014/04/14 20:22:11]

Unsure. oshima@/dnicoara@ would have good answers.

+// gfx::DisplayObserver, etc) do we need here? This is managed from
+// RootWindowCOntroller
+// TODO: Maybe implement gfx::DisplayObserver
+// TODO: Do we need to inherit from OutputConfigurator::Observer to react to
+// OnDisplayModeChanged()?
+class ASH_EXPORT TouchExplorationController :
+    public ui::EventHandler,
+    public DisplayController::Observer {
+ public:
+
+  explicit TouchExplorationController(aura::Window* root_window);
+  virtual ~TouchExplorationController();
+
+ private:
+  // Overriden from ui::EventHandler.
+  virtual void OnTouchEvent(ui::TouchEvent* event) OVERRIDE;
+
+  // Overriden form DisplayController::Observer.
+  virtual void OnDisplaysInitialized() OVERRIDE;
+  virtual void OnDisplayConfigurationChanging() OVERRIDE;
+  virtual void OnDisplayConfigurationChanged() OVERRIDE;
+
+  void GenerateMouseEvent(
+      ui::EventType event_type, gfx::Point location, int flags);
+
+  std::vector<int> touch_ids_;
+  // map of touch ids to their last know locations
+  std::map<int, gfx::Point> touch_locations_;
+
+  const int64 display_id_;
+  aura::Window* root_window_;
+
+  DISALLOW_COPY_AND_ASSIGN(TouchExplorationController);
+};
+
+}  // namespace internal
+}  // namespace ash
+
+#endif  // ASH_TOUCH_TOUCH_EXPLORATION_CONTROLLER_H_