Moves RootWindowController::MoveWindowsTo to WmRootWindowController

ash/common/wm_shell.h

Index: ash/common/wm_shell.h
diff --git a/ash/common/wm_shell.h b/ash/common/wm_shell.h
index ac6927a0b1d1b72b66c753b0dea13b5bad38b6f9..e29d9b194bdfecfc1dc32708e0009fbffe099766 100644
--- a/ash/common/wm_shell.h
+++ b/ash/common/wm_shell.h
@@ -198,10 +198,15 @@ class ASH_EXPORT WmShell {
   // TODO(mash): Remove when DisplayManager has been moved. crbug.com/622480
   virtual bool IsActiveDisplayId(int64_t display_id) const = 0;
 
-  // Returns true if the desktop is in unified mode.
+  // Returns true if the desktop is in unified mode and there are no mirroring
+  // displays.
   // TODO(mash): Remove when DisplayManager has been moved. crbug.com/622480
   virtual bool IsInUnifiedMode() const = 0;
 
+  // Returns true if the desktop is in unified mode.
+  // TODO(mash): Remove when DisplayManager has been moved. crbug.com/622480
+  virtual bool IsInUnifiedModeIgnoreMirroring() const = 0;
+
   // Returns the first display; this is the first display listed by hardware,
   // which corresponds to internal displays on devices with integrated displays.
   // TODO(mash): Remove when DisplayManager has been moved. crbug.com/622480