Added split tap to TouchExplorationController

ui/chromeos/touch_exploration_controller.h

Index: ui/chromeos/touch_exploration_controller.h
diff --git a/ui/chromeos/touch_exploration_controller.h b/ui/chromeos/touch_exploration_controller.h
index 5fe2e09b238a9bcbe6f7be6f40df67920e8fac83..c11a43a968a9c81867d0cfa3578a10d580893574 100644
--- a/ui/chromeos/touch_exploration_controller.h
+++ b/ui/chromeos/touch_exploration_controller.h
@@ -105,7 +105,8 @@ class UI_CHROMEOS_EXPORT TouchExplorationController :
       const ui::TouchEvent& event, scoped_ptr<ui::Event>* rewritten_event);
   ui::EventRewriteStatus InPassthroughMinusOne(
       const ui::TouchEvent& event, scoped_ptr<ui::Event>* rewritten_event);
-
+  ui::EventRewriteStatus InTESecondPress(

[dmazzoni, 2014/06/13 05:52:38]

TE is too abbreviated for me. How about InTouchExplSecondPress?

[evy, 2014/06/13 16:48:07]

Done.
Should the state name be changed from TE_SECOND_PRESS to
TOUCH_EXPL_SECOND_PRESS?

+      const ui::TouchEvent& event, scoped_ptr<ui::Event>* rewritten_event);
   // This timer is started every time we get the first press event, and
   // it fires after the double-click timeout elapses (300 ms by default).
   // If the user taps and releases within 300 ms and doesn't press again,
@@ -159,6 +160,14 @@ class UI_CHROMEOS_EXPORT TouchExplorationController :
     // the user starts a scroll with 2 fingers, they can release either one
     // and continue the scrolling.
     PASSTHROUGH_MINUS_ONE,
+
+    // The user was in touch exploration, but has placed down another finger

[dmazzoni, 2014/06/13 05:52:38]

Nit: end this sentence with a period.

[evy, 2014/06/13 16:48:08]

Done.

+    // If the user releases the second finger, a click will go through

[dmazzoni, 2014/06/13 05:52:38]

To be entirely accurate, we don't send a click, we send the touch press and
release from the second finger - that may be interpreted as a click, but
sometimes it will be subtly different.

[evy, 2014/06/13 16:48:08]

Done.

+    // at the last touch explore location. If the user releases the touch
+    // explore finger, the other finger will continue with touch explore.
+    // Once more than two fingers are pressed, the state is changed to wait
+    // for all fingers to be released before continuing.
+    TE_SECOND_PRESS,
   };
 
   void VLOGState(int line_number);