Handful of tweaks for tab dragging with touch:

ui/aura/test/event_generator.h

Index: ui/aura/test/event_generator.h
diff --git a/ui/aura/test/event_generator.h b/ui/aura/test/event_generator.h
index 0a4ad7d2e53d50c6731b7060c41e922a85f2c698..201179c5012f3168ebe8798287f6af317775ca01 100644
--- a/ui/aura/test/event_generator.h
+++ b/ui/aura/test/event_generator.h
@@ -36,6 +36,12 @@ class EventGenerator {
 
   virtual ~EventGenerator();
 
+  // Explicitly sets the location used by mouse/touch events. This is set by the
+  // various methods that take a location but can be manipulated directly,
+  // typically for touch.
+  void set_current_location(const gfx::Point& location) {
+    current_location_ = location;
+  }
   const gfx::Point& current_location() const { return current_location_; }
 
   // Resets the event flags bitmask.
@@ -90,6 +96,9 @@ class EventGenerator {
   // Generates a touch press event.
   void PressTouch();
 
+  // Generates a ET_TOUCH_MOVED event to |point|.
+  void MoveTouch(const gfx::Point& point);
+
   // Generates a touch release event.
   void ReleaseTouch();