Touch input support for Windows

Had to add some logic to avoid touch and mouse cross-talk, because
(at least on my laptop), the touch screen generates both kinds of
events.

This seems really useful [1] for the many [2] Skia developers with
touch-enabled Windows devices.

----------
1: No, not really.
2: N = 1?

Bug: skia:
Change-Id: Ib888bf4198f2cc0a29a31581ec4b64d3d9008c33
Reviewed-on: https://skia-review.googlesource.com/18920
Reviewed-by: Yuqian Li <liyuqian@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/views/SkTouchGesture.h b/include/views/SkTouchGesture.h
index 6776de7267..faadfc1b3d 100644
--- a/include/views/SkTouchGesture.h
+++ b/include/views/SkTouchGesture.h
@@ -39,6 +39,7 @@ public:
 
     bool isActive() { return fFlinger.isActive(); }
     void stop() { fFlinger.stop(); }
+    bool isBeingTouched() { return kEmpty_State != fState; }
 
     const SkMatrix& localM();
     const SkMatrix& globalM() const { return fGlobalM; }