Add WM_EVENT_TRUSTED_PIN and WINDOW_STATE_TYPE_TRUSTED_PINNED to Ash.

components/exo/shell_surface.h

Index: components/exo/shell_surface.h
diff --git a/components/exo/shell_surface.h b/components/exo/shell_surface.h
index 1c7e3072d1045684ff0c92d207664547205a4651..2d445c592c85dcdebe93f96eacf862b2f151b460 100644
--- a/components/exo/shell_surface.h
+++ b/components/exo/shell_surface.h
@@ -112,8 +112,8 @@ class ShellSurface : public SurfaceDelegate,
   // 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);