Add WM_EVENT_TRUSTED_PIN and WINDOW_STATE_TYPE_TRUSTED_PINNED to Ash.

components/exo/shell_surface.h

 // Copyright 2015 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 COMPONENTS_EXO_SHELL_SURFACE_H_
 #define COMPONENTS_EXO_SHELL_SURFACE_H_
 
 #include <deque>
 #include <memory>
 #include <string>
@@ skipping 94 matching lines @@
 
   // Minimize the shell surface.
   void Minimize();
 
   // Restore the shell surface.
   void Restore();
 
   // Set fullscreen state for shell surface.
   void SetFullscreen(bool fullscreen);
 
-  // Pins the shell surface.
-  void SetPinned(bool pinned);
+  // Pins the shell surface. |trusted| flag is ignored when |pinned| is false.
+  void SetPinned(bool pinned, bool trusted);
 
   // Set title for surface.
   void SetTitle(const base::string16& title);
 
   // Sets the system modality.
   void SetSystemModal(bool system_modal);
 
   // Sets the application ID for the window. The application ID identifies the
   // general class of applications to which the window belongs.
   static void SetApplicationId(aura::Window* window,
@@ skipping 171 matching lines @@
   int top_inset_height_ = 0;
   int pending_top_inset_height_ = 0;
   float rectangular_shadow_background_opacity_ = 1.0;
 
   DISALLOW_COPY_AND_ASSIGN(ShellSurface);
 };
 
 }  // namespace exo
 
 #endif  // COMPONENTS_EXO_SHELL_SURFACE_H_