Add WM_EVENT_TRUSTED_PIN and WINDOW_STATE_TYPE_TRUSTED_PINNED to Ash.

ash/accelerators/accelerator_commands_unittest.cc

 // Copyright 2013 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/common/accelerators/accelerator_commands.h"
 
 #include <memory>
 
 #include "ash/accelerators/accelerator_commands_aura.h"
 #include "ash/common/wm/window_state.h"
@@ skipping 40 matching lines @@
   EXPECT_TRUE(window_state1->IsNormalStateType());
   EXPECT_TRUE(window_state1->IsActive());
 }
 
 TEST_F(AcceleratorCommandsTest, Unpin) {
   std::unique_ptr<aura::Window> window1(
       CreateTestWindowInShellWithBounds(gfx::Rect(5, 5, 20, 20)));
   wm::WindowState* window_state1 = wm::GetWindowState(window1.get());
   window_state1->Activate();
 
-  wm::PinWindow(window1.get());
+  wm::PinWindow(window1.get(), /* trusted */ false);
   EXPECT_TRUE(window_state1->IsPinned());
 
   Unpin();
   EXPECT_FALSE(window_state1->IsPinned());
 }
 
 }  // namespace accelerators
 }  // namespace ash