Maximize windows when double clicking their title bar.

ui/aura/test/event_generator.h

Index: ui/aura/test/event_generator.h
===================================================================
--- ui/aura/test/event_generator.h	(revision 112237)
+++ ui/aura/test/event_generator.h	(working copy)
@@ -41,6 +41,9 @@
   // Generates events to click (press, release) left button.
   void ClickLeftButton();
 
+  // Generates a double click event using the left button.
+  void DoubleClickLeftButton();
+
   // Generates events to move mouse to be the given |point|.
   void MoveMouseTo(const gfx::Point& point);