Wires up mouse capture code for aura.

ui/aura/window_delegate.h

Index: ui/aura/window_delegate.h
diff --git a/ui/aura/window_delegate.h b/ui/aura/window_delegate.h
index 956763b76b29b170ab2996fb524bc4d2cac3c933..2c420561e43a0b8ba3eb10e556e74bebae76074d 100644
--- a/ui/aura/window_delegate.h
+++ b/ui/aura/window_delegate.h
@@ -36,6 +36,12 @@ class WindowDelegate {
 
   virtual bool OnMouseEvent(MouseEvent* event) = 0;
 
+  // Invoked when mouse capture is gained on the window.
+  virtual void OnCaptureGained() = 0;
+
+  // Invoked when mouse capture is lost on the window.
+  virtual void OnCaptureLost() = 0;
+
   // Asks the delegate to paint window contents into the supplied canvas.
   virtual void OnPaint(gfx::Canvas* canvas) = 0;