Fix Ash on Windows multi-monitor support and snap-view sizing.

ui/aura/remote_root_window_host_win.cc

Index: ui/aura/remote_root_window_host_win.cc
diff --git a/ui/aura/remote_root_window_host_win.cc b/ui/aura/remote_root_window_host_win.cc
index c4771108c4744725a5b84044ce62c0e6e0f51c0b..d2e306ca521ca8575747b883df6623e421c4000c 100644
--- a/ui/aura/remote_root_window_host_win.cc
+++ b/ui/aura/remote_root_window_host_win.cc
@@ -156,6 +156,8 @@ bool RemoteRootWindowHostWin::OnMessageReceived(const IPC::Message& message) {
                         OnSelectFolderDone)
     IPC_MESSAGE_HANDLER(MetroViewerHostMsg_WindowActivated,
                         OnWindowActivated)
+    IPC_MESSAGE_HANDLER(MetroViewerHostMsg_WindowSizeChanged,
+                        OnWindowSizeChanged)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
@@ -461,6 +463,10 @@ void RemoteRootWindowHostWin::OnWindowActivated(bool active) {
   active ? GetRootWindow()->Focus() : GetRootWindow()->Blur();
 }
 
+void RemoteRootWindowHostWin::OnWindowSizeChanged(int32 width, int32 height) {
+  SetBounds(gfx::Rect(0, 0, width, height));
+}
+
 void RemoteRootWindowHostWin::DispatchKeyboardMessage(ui::EventType type,
                                                       uint32 vkey,
                                                       uint32 repeat_count,