exo: Implement v6 of touch protocol including shape and frame event

components/exo/touch_delegate.h

Index: components/exo/touch_delegate.h
diff --git a/components/exo/touch_delegate.h b/components/exo/touch_delegate.h
index 6a65d7704555ad7adb903bd25f07d77cb24c5d3b..6ea08c90cc45768473611b3820f6d45ae6e30f8c 100644
--- a/components/exo/touch_delegate.h
+++ b/components/exo/touch_delegate.h
@@ -44,6 +44,12 @@ class TouchDelegate {
                              int id,
                              const gfx::Point& location) = 0;
 
+  // Called when a touch point has changed it's shape.

[reveman, 2016/12/07 03:16:18]

s/it's/its/

[denniskempin, 2016/12/07 23:40:54]

I keep using the ESL excuse, but after 4 years in the US that doesn't cut it
anymore ;)

+  virtual void OnTouchShape(int id, float major, float minor) = 0;
+
+  // Called when the client should apply all updated touches.
+  virtual void OnTouchFrame() = 0;
+
   // Called when the touch session has been canceled. Touch cancellation
   // applies to all touch points currently active.
   virtual void OnTouchCancel() = 0;