Show a visual indicator for the progress of auto-click.

ash/autoclick/autoclick_controller.h

Index: ash/autoclick/autoclick_controller.h
diff --git a/ash/autoclick/autoclick_controller.h b/ash/autoclick/autoclick_controller.h
index 46b9ef48089678fab9e38bc0bebfbc1c67411b14..d718479b4c20fd6971d081e8feed9d00dad4e426 100644
--- a/ash/autoclick/autoclick_controller.h
+++ b/ash/autoclick/autoclick_controller.h
@@ -5,7 +5,12 @@
 #ifndef ASH_AUTOCLICK_AUTOCLICK_CONTROLLER_H
 #define ASH_AUTOCLICK_AUTOCLICK_CONTROLLER_H
 
+#include <memory>
+
 #include "ash/ash_export.h"
+#include "base/macros.h"
+#include "base/time/time.h"
+#include "ui/gfx/geometry/point.h"
 
 namespace ash {
 
@@ -14,8 +19,31 @@ namespace ash {
 // the mouse had been at rest.
 class ASH_EXPORT AutoclickController {
  public:
+  class Delegate {
+   public:
+    Delegate() {}
+    virtual ~Delegate() {}
+
+    // Called when an autoclick gesture begins.
+    virtual void StartGesture(base::TimeDelta duration,
+                              const gfx::Point& center_point_in_screen) = 0;
+
+    // Called when the gesture has ended, either because the mouse moved or
+    // because the autoclick completed.
+    virtual void StopGesture() = 0;
+
+    // Called when the autoclick target has changed.
+    virtual void SetGestureCenter(const gfx::Point& center_point_in_screen) = 0;
+
+   private:
+    DISALLOW_COPY_AND_ASSIGN(Delegate);
+  };
+
   virtual ~AutoclickController() {}
 
+  // Set the delegate to work with.
+  virtual void SetDelegate(std::unique_ptr<Delegate> delegate) = 0;
+
   // Set whether autoclicking is enabled.
   virtual void SetEnabled(bool enabled) = 0;
 
@@ -24,10 +52,10 @@ class ASH_EXPORT AutoclickController {
 
   // Set the time to wait in milliseconds from when the mouse stops moving
   // to when the autoclick event is sent.
-  virtual void SetAutoclickDelay(int delay_ms) = 0;
+  virtual void SetAutoclickDelay(base::TimeDelta delay) = 0;
 
   // Returns the autoclick delay in milliseconds.
-  virtual int GetAutoclickDelay() const = 0;
+  virtual base::TimeDelta GetAutoclickDelay() const = 0;
 
   static AutoclickController* CreateInstance();
 
@@ -35,6 +63,9 @@ class ASH_EXPORT AutoclickController {
   // the autoclick.
   static const int kDefaultAutoclickDelayMs;
 
+  // Gets the default wait time as a base::TimeDelta object.
+  static base::TimeDelta GetDefaultAutoclickDelay();
+
  protected:
   AutoclickController() {}
 };