Makes construction of (ash)RemoteWindowTreeHostWin explicit

chrome/browser/ui/ash/ash_init.h

Index: chrome/browser/ui/ash/ash_init.h
diff --git a/chrome/browser/ui/ash/ash_init.h b/chrome/browser/ui/ash/ash_init.h
index 6ed1a0fd5cda618a296155566fcc23c57f146ff2..b1141bd111b682cab6a8162748a77fb4cfe1c73e 100644
--- a/chrome/browser/ui/ash/ash_init.h
+++ b/chrome/browser/ui/ash/ash_init.h
@@ -5,13 +5,16 @@
 #ifndef CHROME_BROWSER_UI_ASH_ASH_INIT_H_
 #define CHROME_BROWSER_UI_ASH_ASH_INIT_H_
 
+#include "ui/gfx/native_widget_types.h"
+
 namespace chrome {
 
 // Returns true if Ash should be run at startup.
 bool ShouldOpenAshOnStartup();
 
-// Creates the Ash Shell and opens the Ash window.
-void OpenAsh();
+// Creates the Ash Shell and opens the Ash window. |remote_window| is only used
+// on windows. It provides the HWND to the remote window.
+void OpenAsh(gfx::AcceleratedWidget remote_window);
 
 // Closes the Ash window and destroys the Ash Shell.
 void CloseAsh();