Implement CSS: scroll-boundary-behavior

third_party/WebKit/public/platform/WebLayer.h

Index: third_party/WebKit/public/platform/WebLayer.h
diff --git a/third_party/WebKit/public/platform/WebLayer.h b/third_party/WebKit/public/platform/WebLayer.h
index 07ef4a6baed51ed0044ea32455db396aaf92c23d..d589311767899a9ef3e4b36f19ebc9c2188a3667 100644
--- a/third_party/WebKit/public/platform/WebLayer.h
+++ b/third_party/WebKit/public/platform/WebLayer.h
@@ -36,6 +36,7 @@
 #include "WebFloatSize.h"
 #include "WebPoint.h"
 #include "WebRect.h"
+#include "WebScrollBoundaryBehavior.h"
 #include "WebSize.h"
 #include "WebString.h"
 #include "WebTouchInfo.h"
@@ -212,6 +213,8 @@ class WebLayer {
   // deleting the scroll client.
   virtual void SetScrollClient(WebLayerScrollClient*) = 0;
 
+  virtual void SetScrollBoundaryBehavior(const WebScrollBoundaryBehavior&) = 0;

[Rick Byers, 2017/07/18 18:44:25]

nit: please add a comment describing at a high level the purpose of this API. 
We try to make the public API be fairly well documented (compared to other areas
of blink) - eg. there are chromium developers who will use public/ APIs but
never look at any of the code underneath it.

+
   // Sets the cc-side layer client.
   virtual void SetLayerClient(cc::LayerClient*) = 0;