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

ash/drag_drop/drag_drop_controller_unittest.cc

 // Copyright (c) 2012 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.
 
 #include "ash/drag_drop/drag_drop_controller.h"
 
 #include "ash/drag_drop/drag_drop_tracker.h"
 #include "ash/drag_drop/drag_image_view.h"
 #include "ash/shell.h"
 #include "ash/test/ash_test_base.h"
@@ skipping 1059 matching lines @@
   AddViewToWidgetAndResize(widget.get(), drag_view);
   ui::OSExchangeData data;
   data.SetString(base::UTF8ToUTF16("I am being dragged"));
   ui::test::EventGenerator generator(Shell::GetPrimaryRootWindow(),
                                      widget->GetNativeView());
 
   gfx::Point start = gfx::Rect(drag_view->bounds()).CenterPoint();
   gfx::Point mid = start + gfx::Vector2d(drag_view->bounds().width() / 6, 0);
   gfx::Point end = start + gfx::Vector2d(drag_view->bounds().width() / 3, 0);
 
-  base::TimeDelta timestamp = ui::EventTimeForNow();
+  base::TimeTicks timestamp = ui::EventTimeForNow();
   ui::TouchEvent press(ui::ET_TOUCH_PRESSED, start, 0, timestamp);
   generator.Dispatch(&press);
 
   DispatchGesture(ui::ET_GESTURE_LONG_PRESS, start);
   UpdateDragData(&data);
   timestamp += base::TimeDelta::FromMilliseconds(10);
   ui::TouchEvent move1(ui::ET_TOUCH_MOVED, mid, 0, timestamp);
   generator.Dispatch(&move1);
   // Doing two moves instead of one will guarantee to generate a fling at the
   // end.
@@ skipping 11 matching lines @@
             drag_drop_controller_->drag_string_);
   EXPECT_EQ(1, drag_view->num_drag_enters_);
   EXPECT_EQ(2, drag_view->num_drag_updates_);
   EXPECT_EQ(1, drag_view->num_drops_);
   EXPECT_EQ(0, drag_view->num_drag_exits_);
   EXPECT_TRUE(drag_view->drag_done_received_);
 }
 
 }  // namespace test
 }  // namespace ash