Identity the mouse pointer type from low-level events for Mac

content/browser/renderer_host/render_widget_host_view_mac.h

Index: content/browser/renderer_host/render_widget_host_view_mac.h
diff --git a/content/browser/renderer_host/render_widget_host_view_mac.h b/content/browser/renderer_host/render_widget_host_view_mac.h
index c873f2fa013d82b73f9ff3f9a379b1b7ef61940a..b8fc641ae07df3284583e6b9633de501f7d1dde8 100644
--- a/content/browser/renderer_host/render_widget_host_view_mac.h
+++ b/content/browser/renderer_host/render_widget_host_view_mac.h
@@ -183,6 +183,10 @@ class Layer;
   // The filter used to guide touch events towards a horizontal or vertical
   // orientation.
   content::MouseWheelRailsFilterMac mouseWheelFilter_;
+
+  // This is used to indicate if the pointing device enters or leaves the
+  // proximity of its tablet.
+  BOOL stylusEnteringProximity_;

[tdresser, 2016/05/31 13:05:34]

Should this be stylusWithinProximity?

With this patch, if a hold a stylus near the screen, and move my mouse around,
we'll think it's a stylus, correct?

We should avoid that if possible.

[lanwei, 2016/05/31 14:33:35]

You are right, I should add some checks to the mouse events.

 }
 
 @property(nonatomic, readonly) NSRange selectedRange;