Change ui::Event::time_stamp from TimeDelta to TimeTicks

ui/events/test/event_generator.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 UI_EVENTS_TEST_EVENT_GENERATOR_H_
 #define UI_EVENTS_TEST_EVENT_GENERATOR_H_
 
 #include <list>
 #include <memory>
 #include <vector>
@@ skipping 354 matching lines @@
   void Dispatch(Event* event);
 
   void set_current_target(EventTarget* target) {
     current_target_ = target;
   }
 
   // Specify an alternative tick clock to be used for simulating time in tests.
   void SetTickClock(std::unique_ptr<base::TickClock> tick_clock);
 
   // Get the current time from the tick clock.
-  base::TimeDelta Now();
+  base::TimeTicks Now();
 
   // Default delegate set by a platform-specific GeneratorDelegate singleton.
   static EventGeneratorDelegate* default_delegate;
 
  private:
   // Set up the test context using the delegate.
   void Init(gfx::NativeWindow root_window, gfx::NativeWindow window_context);
 
   // Dispatch a key event to the WindowEventDispatcher.
   void DispatchKeyEvent(bool is_press, KeyboardCode key_code, int flags);
@@ skipping 22 matching lines @@
   bool targeting_application_;
   std::unique_ptr<base::TickClock> tick_clock_;
 
   DISALLOW_COPY_AND_ASSIGN(EventGenerator);
 };
 
 }  // namespace test
 }  // namespace ui
 
 #endif  // UI_EVENTS_TEST_EVENT_GENERATOR_H_