Drag and rotate windows

ui/aura_shell/workspace/workspace_manager.h

Index: ui/aura_shell/workspace/workspace_manager.h
diff --git a/ui/aura_shell/workspace/workspace_manager.h b/ui/aura_shell/workspace/workspace_manager.h
index 925fea24925d445180e7eb5e2fb4385bb8f81b26..ace5ea69a9ddc22fc61a6cebc33cd0b1f7c30a04 100644
--- a/ui/aura_shell/workspace/workspace_manager.h
+++ b/ui/aura_shell/workspace/workspace_manager.h
@@ -44,6 +44,9 @@ class AURA_SHELL_EXPORT WorkspaceManager : public aura::DesktopObserver {
   // Returns the workspace that contanis the |window|.
   Workspace* FindBy(aura::Window* window) const;
 
+  // Returns the window for swap operation based on the |location|.
+  aura::Window* FindSwapWindowForLocation(const gfx::Point& location);
+
   // Sets the bounds of all workspaces.
   void LayoutWorkspaces();
 
@@ -54,6 +57,11 @@ class AURA_SHELL_EXPORT WorkspaceManager : public aura::DesktopObserver {
   void SetOverview(bool overview);
   bool is_overview() const { return is_overview_; }
 
+  // Swaps the |drag| and |target|. If they're in the same workspace,
+  // this simply swaps the layout location. If they're in the different
+  // workspaces, these windows move between workspaces.
+  void SwapWindow(aura::Window* drag, aura::Window* target);
+
   // Overridden from aura::DesktopObserver:
   virtual void OnDesktopResized(const gfx::Size& new_size) OVERRIDE;
   virtual void OnActiveWindowChanged(aura::Window* active) OVERRIDE;
@@ -62,6 +70,7 @@ class AURA_SHELL_EXPORT WorkspaceManager : public aura::DesktopObserver {
   friend class Workspace;
   FRIEND_TEST_ALL_PREFIXES(WorkspaceManagerTest, Overview);
   FRIEND_TEST_ALL_PREFIXES(WorkspaceManagerTest, LayoutWorkspaces);
+  FRIEND_TEST_ALL_PREFIXES(WorkspaceManagerTest, FindSwapWindow);
 
   void AddWorkspace(Workspace* workspace);
   void RemoveWorkspace(Workspace* workspace);