Makes RootWindowController window creation in terms of common types

mash/wm/bridge/wm_window_mus.h

Index: mash/wm/bridge/wm_window_mus.h
diff --git a/mash/wm/bridge/wm_window_mus.h b/mash/wm/bridge/wm_window_mus.h
index 05c649e1389ec436471aa5ef6071df66800d0c7f..6bb0dbfc0f309565a0cfba75c89a342b8305dff7 100644
--- a/mash/wm/bridge/wm_window_mus.h
+++ b/mash/wm/bridge/wm_window_mus.h
@@ -97,10 +97,14 @@ class WmWindowMus : public ash::wm::WmWindow, public mus::WindowObserver {
     return ash::wm::WmWindow::GetWindowState();
   }
 
+  // See description of |children_use_extended_hit_region_|.
+  bool ShouldUseExtendedHitRegion() const;
+
   // WmWindow:
   const ash::wm::WmWindow* GetRootWindow() const override;
   ash::wm::WmRootWindowController* GetRootWindowController() override;
   ash::wm::WmGlobals* GetGlobals() const override;
+  void SetName(const char* name) override;
   base::string16 GetTitle() const override;
   void SetShellWindowId(int id) override;
   int GetShellWindowId() const override;
@@ -145,6 +149,8 @@ class WmWindowMus : public ash::wm::WmWindow, public mus::WindowObserver {
   void Animate(::wm::WindowAnimationType type) override;
   void StopAnimatingProperty(
       ui::LayerAnimationElement::AnimatableProperty property) override;
+  void SetChildWindowVisibilityChangesAnimated() override;
+  void SetMasksToBounds(bool value) override;
   void SetBounds(const gfx::Rect& bounds) override;
   void SetBoundsWithTransitionDelay(const gfx::Rect& bounds,
                                     base::TimeDelta delta) override;
@@ -194,7 +200,12 @@ class WmWindowMus : public ash::wm::WmWindow, public mus::WindowObserver {
   std::vector<ash::wm::WmWindow*> GetChildren() override;
   void ShowResizeShadow(int component) override;
   void HideResizeShadow() override;
+  void SetBoundsInScreenBehaviorForChildren(
+      BoundsInScreenBehavior behavior) override;
+  void SetSnapsChildrenToPhysicalPixelBoundary() override;
   void SnapToPixelBoundaryIfNecessary() override;
+  void SetChildrenUseExtendedHitRegion() override;
+  void SetDescendantsStayInSameRootWindow(bool value) override;
   void AddObserver(ash::wm::WmWindowObserver* observer) override;
   void RemoveObserver(ash::wm::WmWindowObserver* observer) override;
 
@@ -234,6 +245,12 @@ class WmWindowMus : public ash::wm::WmWindow, public mus::WindowObserver {
 
   ui::WindowShowState restore_show_state_ = ui::SHOW_STATE_DEFAULT;
 
+  bool snap_children_to_pixel_boundary_ = false;
+
+  // If true child windows should get a slightly larger hit region to make
+  // resizing easier.
+  bool children_use_extended_hit_region_ = false;
+
   DISALLOW_COPY_AND_ASSIGN(WmWindowMus);
 };