Add Vector2d classes that represent offsets, instead of using Point.

ash/wm/workspace/workspace_event_handler_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/wm/workspace/workspace_event_handler.h"
 
 #include "ash/shell.h"
 #include "ash/test/ash_test_base.h"
 #include "ash/wm/property_util.h"
 #include "ash/wm/window_util.h"
@@ skipping 136 matching lines @@
   scoped_ptr<aura::Window> window2(
       CreateTestWindow(&wd2, gfx::Rect(0, 0, 500, 500)));
 
   aura::test::TestWindowDelegate wd;
   const gfx::Rect bounds(10, 20, 30, 40);
   scoped_ptr<aura::Window> window(CreateTestWindow(&wd, bounds));
   wd.set_window_component(HTCAPTION);
   aura::test::EventGenerator generator(window->GetRootWindow());
   generator.MoveMouseToCenterOf(window.get());
   generator.PressLeftButton();
-  generator.MoveMouseTo(generator.current_location().Add(gfx::Point(50, 50)));
+  generator.MoveMouseTo(
+      generator.current_location().Add(gfx::Vector2d(50, 50)));
   DCHECK_NE(bounds.origin().ToString(), window->bounds().origin().ToString());
   window.reset();
-  generator.MoveMouseTo(generator.current_location().Add(gfx::Point(50, 50)));
+  generator.MoveMouseTo(
+      generator.current_location().Add(gfx::Vector2d(50, 50)));
 }
 
 // Verifies deleting the window while in a run loop doesn't crash.
 TEST_F(WorkspaceEventHandlerTest, DeleteWhileInRunLoop) {
   aura::test::TestWindowDelegate wd;
   const gfx::Rect bounds(10, 20, 30, 40);
   scoped_ptr<aura::Window> window(CreateTestWindow(&wd, bounds));
   wd.set_window_component(HTCAPTION);
 
   ASSERT_TRUE(aura::client::GetWindowMoveClient(window->parent()));
   MessageLoop::current()->DeleteSoon(FROM_HERE, window.get());
   aura::client::GetWindowMoveClient(window->parent())->RunMoveLoop(
-      window.release(), gfx::Point());
+      window.release(), gfx::Vector2d());
 }
 
 }  // namespace internal
 }  // namespace ash