Changes MouseEvent constructor to take changed_button_flags.

ui/aura/window_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 "ui/aura/window.h"
 
 #include <string>
 #include <utility>
 #include <vector>
 
@@ skipping 1203 matching lines @@
       CreateTestWindowWithDelegate(&d1, 1, gfx::Rect(10, 10, 50, 50),
                                    root_window()));
 
   test::EventGenerator generator(root_window());
   generator.MoveMouseToCenterOf(w1.get());
   EXPECT_TRUE(d1.entered());
   EXPECT_FALSE(d1.exited());
   d1.ResetExpectations();
 
   ui::MouseEvent exit_event(
-      ui::ET_MOUSE_EXITED, gfx::Point(), gfx::Point(), 0);
+      ui::ET_MOUSE_EXITED, gfx::Point(), gfx::Point(), 0, 0);
   dispatcher()->AsRootWindowHostDelegate()->OnHostMouseEvent(&exit_event);
   EXPECT_FALSE(d1.entered());
   EXPECT_TRUE(d1.exited());
 }
 
 // Verifies that the WindowDelegate receives MouseExit and MouseEnter events for
 // mouse transitions from window to window, even if the entered window sets
 // and releases capture.
 TEST_F(WindowTest, MouseEnterExitWithClick) {
   MouseEnterExitWindowDelegate d1;
@@ skipping 2473 matching lines @@
               BuildRootLayerTreeDescription(*root.layer()))
         << "layer tree doesn't match at " << i;
     EXPECT_EQ(data[i].expected_description,
               BuildRootWindowTreeDescription(root))
         << "window tree doesn't match at " << i;
   }
 }
 
 }  // namespace test
 }  // namespace aura