Draggable region support for frameless app window on CrOS.

ui/aura/window.h

Index: ui/aura/window.h
diff --git a/ui/aura/window.h b/ui/aura/window.h
index 8d98ffa54f18ac4a39a60c308b3c2e1f09a63d41..3a385564730ab8a80b89f4518f73e6679ab23298 100644
--- a/ui/aura/window.h
+++ b/ui/aura/window.h
@@ -27,6 +27,7 @@
 #include "ui/gfx/rect.h"
 
 class SkCanvas;
+class SkRegion;
 
 namespace gfx {
 class Display;
@@ -264,6 +265,10 @@ class AURA_EXPORT Window : public ui::LayerDelegate,
     return hit_test_bounds_override_inner_;
   }
 
+  // The region specified can be used to drag the window.
+  // The window will take the ownership of the specified region.
+  void SetDraggableRegion(SkRegion* region);

[Ben Goodger (Google), 2012/08/17 17:10:24]

Aura is agnostic of things that relate specifically to a window manager, such as
draggable regions. This type of thing really belongs in Ash.

+
   // Returns true if the |point_in_root| in root window's coordinate falls
   // within this window's bounds. Returns false if the window is detached
   // from root window.
@@ -282,7 +287,8 @@ class AURA_EXPORT Window : public ui::LayerDelegate,
 
   // Returns the Window that most closely encloses |local_point| for the
   // purposes of event targeting.
-  Window* GetEventHandlerForPoint(const gfx::Point& local_point);
+  Window* GetEventHandlerForPoint(const gfx::Point& local_point,
+                                  ui::EventType event_type);
 
   // Returns the topmost Window with a delegate containing |local_point|.
   Window* GetTopWindowContainingPoint(const gfx::Point& local_point);
@@ -381,11 +387,11 @@ class AURA_EXPORT Window : public ui::LayerDelegate,
   // Gets a Window (either this one or a subwindow) containing |local_point|.
   // If |return_tightest| is true, returns the tightest-containing (i.e.
   // furthest down the hierarchy) Window containing the point; otherwise,
-  // returns the loosest.  If |for_event_handling| is true, then hit-test masks
-  // are honored; otherwise, only bounds checks are performed.
+  // returns the loosest.  If |event_type| is provided (!ET_UNKNOWN), then
+  // hit-test masks are honored; otherwise, only bounds checks are performed.
   Window* GetWindowForPoint(const gfx::Point& local_point,
                             bool return_tightest,
-                            bool for_event_handling);
+                            ui::EventType event_type);
 
   // Implementation of RemoveChild(). If |child| is being removed as the result
   // of an add, |new_parent| is the new parent |child| is going to be parented
@@ -481,6 +487,9 @@ class AURA_EXPORT Window : public ui::LayerDelegate,
   gfx::Insets hit_test_bounds_override_outer_touch_;
   gfx::Insets hit_test_bounds_override_inner_;
 
+  // Region that can be used to drag the window.
+  scoped_ptr<SkRegion> draggable_region_;
+
   ObserverList<WindowObserver> observers_;
 
   // Value struct to keep the name and deallocator for this property.