wip: Second crack at implementing the touch exploration mode.

ash/root_window_controller.h

Index: ash/root_window_controller.h
diff --git a/ash/root_window_controller.h b/ash/root_window_controller.h
index 6199a5cee1c6efca27efe385d1dde273f62f9fba..11d431bd6a82cb35a1e611f1607062ad1c8127c4 100644
--- a/ash/root_window_controller.h
+++ b/ash/root_window_controller.h
@@ -17,6 +17,11 @@
 #include "ui/aura/window_tree_host.h"
 #include "ui/base/ui_base_types.h"
 
+#if defined(OS_CHROMEOS)
+#include "ash/system/tray_accessibility.h"
+#include "ash/test/root_window_controller_test_api_chromeos.h"
+#endif
+
 class SkBitmap;
 
 namespace aura {
@@ -34,6 +39,10 @@ class KeyboardController;
 
 namespace ui {
 class EventHandler;
+
+#if defined(OS_CHROMEOS)
+class TouchExplorationController;
+#endif
 }
 
 namespace views {
@@ -77,7 +86,11 @@ class BootSplashScreen;
 // The RootWindowController for particular root window is stored in
 // its property (RootWindowSettings) and can be obtained using
 // |GetRootWindowController(aura::WindowEventDispatcher*)| function.
-class ASH_EXPORT RootWindowController : public ShellObserver {
+class ASH_EXPORT RootWindowController :
+#if defined(OS_CHROMEOS)
+                                        public AccessibilityObserver,
+#endif
+                                        public ShellObserver {
  public:
 
   // Creates and Initialize the RootWindowController for primary display.
@@ -239,6 +252,10 @@ class ASH_EXPORT RootWindowController : public ShellObserver {
   bool IsVirtualKeyboardWindow(aura::Window* window);
 
  private:
+#if defined(OS_CHROMEOS)
+  friend class ash::test::RootWindowControllerTestApi;
+#endif
+
   explicit RootWindowController(AshWindowTreeHost* host);
   enum RootWindowType {
     PRIMARY,
@@ -261,6 +278,10 @@ class ASH_EXPORT RootWindowController : public ShellObserver {
   // types in the shell UI.
   void CreateContainersInRootWindow(aura::Window* root_window);
 
+#if defined(OS_CHROMEOS)
+  void UpdateTouchExplorationState();
+#endif
+
   // Enables projection touch HUD.
   void EnableTouchHudProjection();
 
@@ -271,6 +292,12 @@ class ASH_EXPORT RootWindowController : public ShellObserver {
   virtual void OnLoginStateChanged(user::LoginStatus status) OVERRIDE;
   virtual void OnTouchHudProjectionToggled(bool enabled) OVERRIDE;
 
+#if defined(OS_CHROMEOS)
+  // Overridden from AccessibilityObserver.
+  virtual void OnAccessibilityModeChanged(
+      AccessibilityNotificationVisibility notify) OVERRIDE;
+#endif
+
   scoped_ptr<AshWindowTreeHost> ash_host_;
   RootWindowLayoutManager* root_window_layout_;
 
@@ -293,8 +320,10 @@ class ASH_EXPORT RootWindowController : public ShellObserver {
   PanelLayoutManager* panel_layout_manager_;
 
   scoped_ptr<SystemBackgroundController> system_background_;
+
 #if defined(OS_CHROMEOS)
   scoped_ptr<BootSplashScreen> boot_splash_screen_;
+  scoped_ptr<ui::TouchExplorationController> touch_exploration_controller_;
 #endif
 
   scoped_ptr<ScreenDimmer> screen_dimmer_;