Extract the code for supporing extended desktop from WorkspaceWindowResizer into DragWindowResizer.

ash/wm/workspace/workspace_window_resizer.h

Index: ash/wm/workspace/workspace_window_resizer.h
diff --git a/ash/wm/workspace/workspace_window_resizer.h b/ash/wm/workspace/workspace_window_resizer.h
index f234a9eece5078e7327556c2493c3b50402a0b52..a4bc97130c7daf075d08b250efc7b5057478f080 100644
--- a/ash/wm/workspace/workspace_window_resizer.h
+++ b/ash/wm/workspace/workspace_window_resizer.h
@@ -14,18 +14,9 @@
 #include "base/memory/scoped_ptr.h"
 #include "ui/aura/window_tracker.h"
 
-namespace aura {
-class RootWindow;
-}  // namespace aura
-
-namespace ui {
-class Layer;
-}  // namespace ui
-
 namespace ash {
 namespace internal {
 
-class DragWindowController;
 class PhantomWindowController;
 class SnapSizer;
 class WindowSize;
@@ -37,6 +28,9 @@ class WindowSize;
 // attempt to restore the old height.
 class ASH_EXPORT WorkspaceWindowResizer : public WindowResizer {
  public:
+  WorkspaceWindowResizer(const Details& details,
+                         const std::vector<aura::Window*>& attached_windows);
+
   // When dragging an attached window this is the min size we'll make sure is
   // visible. In the vertical direction we take the max of this and that from
   // the delegate.
@@ -58,13 +52,6 @@ class ASH_EXPORT WorkspaceWindowResizer : public WindowResizer {
       int window_component,
       const std::vector<aura::Window*>& attached_windows);
 
-  // Returns true if the drag will result in changing the window in anyway.
-  bool is_resizable() const { return details_.is_resizable; }
-
-  const gfx::Point& initial_location_in_parent() const {
-    return details_.initial_location_in_parent;
-  }
-
   // Overridden from WindowResizer:
   virtual void Drag(const gfx::Point& location_in_parent,
                     int event_flags) OVERRIDE;
@@ -72,12 +59,11 @@ class ASH_EXPORT WorkspaceWindowResizer : public WindowResizer {
   virtual void RevertDrag() OVERRIDE;
   virtual aura::Window* GetTarget() OVERRIDE;
 
- private:
-  WorkspaceWindowResizer(const Details& details,
-                         const std::vector<aura::Window*>& attached_windows);
+  const gfx::Point& GetInitialLocationInParentForTest() const {
+    return details_.initial_location_in_parent;
+  }
 
  private:
-  FRIEND_TEST_ALL_PREFIXES(WorkspaceWindowResizerTest, DragWindowController);
   FRIEND_TEST_ALL_PREFIXES(WorkspaceWindowResizerTest, CancelSnapPhantom);
   FRIEND_TEST_ALL_PREFIXES(WorkspaceWindowResizerTest, PhantomSnapMaxSize);
 
@@ -167,10 +153,6 @@ class ASH_EXPORT WorkspaceWindowResizer : public WindowResizer {
   void UpdateSnapPhantomWindow(const gfx::Point& location,
                                const gfx::Rect& bounds);
 
-  // Updates the bounds of the phantom window for window dragging. Set true on
-  // |in_original_root| if the pointer is still in |window()->GetRootWindow()|.
-  void UpdateDragWindow(const gfx::Rect& bounds, bool in_original_root);
-
   // Restacks the windows z-order position so that one of the windows is at the
   // top of the z-order, and the rest directly underneath it.
   void RestackWindows();
@@ -179,9 +161,6 @@ class ASH_EXPORT WorkspaceWindowResizer : public WindowResizer {
   // snapping should be used.
   SnapType GetSnapType(const gfx::Point& location) const;
 
-  // Returns true if we should allow the mouse pointer to warp.
-  bool ShouldAllowMouseWarp() const;
-
   aura::Window* window() const { return details_.window; }
 
   const Details details_;
@@ -205,9 +184,6 @@ class ASH_EXPORT WorkspaceWindowResizer : public WindowResizer {
   // is a grid and the caption is being dragged.
   scoped_ptr<PhantomWindowController> snap_phantom_window_controller_;
 
-  // Shows a semi-transparent image of the window being dragged.
-  scoped_ptr<DragWindowController> drag_window_controller_;
-
   // Used to determine the target position of a snap.
   scoped_ptr<SnapSizer> snap_sizer_;
 
@@ -222,10 +198,6 @@ class ASH_EXPORT WorkspaceWindowResizer : public WindowResizer {
   // The mouse location passed to Drag().
   gfx::Point last_mouse_location_;
 
-  // If non-NULL the destructor sets this to true. Used to determine if this has
-  // been deleted.
-  bool* destroyed_;
-
   // Window the drag has magnetically attached to.
   aura::Window* magnetism_window_;