aura: Gesture event plumbing (skeleton).

ui/aura/root_window.h

Index: ui/aura/root_window.h
diff --git a/ui/aura/root_window.h b/ui/aura/root_window.h
index d38a535e3296bbb95dbed52b0da4e2f97bc0bb5f..030774ec9cbd92e53ecc77d1c6ab460201c450f9 100644
--- a/ui/aura/root_window.h
+++ b/ui/aura/root_window.h
@@ -39,6 +39,7 @@ class ScreenAura;
 class StackingClient;
 class ScrollEvent;
 class TouchEvent;
+class GestureEvent;
 
 // RootWindow is responsible for hosting a set of windows.
 class AURA_EXPORT RootWindow : public ui::CompositorDelegate,
@@ -94,6 +95,11 @@ class AURA_EXPORT RootWindow : public ui::CompositorDelegate,
   // Handles a touch event. Returns true if handled.
   bool DispatchTouchEvent(TouchEvent* event);
 
+  // Handles a gesture event. Returns true if handled. Unlike the other
+  // event-dispatching function (e.g. for touch/mouse/keyboard events), gesture
+  // events are dispatched from GestureRecognizer instead of RootWindowHost.
+  bool DispatchGestureEvent(GestureEvent* event);
+
   // Called when the host changes size.
   void OnHostResized(const gfx::Size& size);
 
@@ -156,6 +162,7 @@ class AURA_EXPORT RootWindow : public ui::CompositorDelegate,
   bool ProcessMouseEvent(Window* target, MouseEvent* event);
   bool ProcessKeyEvent(Window* target, KeyEvent* event);
   ui::TouchStatus ProcessTouchEvent(Window* target, TouchEvent* event);
+  ui::GestureStatus ProcessGestureEvent(Window* target, GestureEvent* event);
 
   // Overridden from Window:
   virtual bool CanFocus() const OVERRIDE;