Initial touch-action main thread implementation

public/web/WebWidgetClient.h

Index: public/web/WebWidgetClient.h
diff --git a/public/web/WebWidgetClient.h b/public/web/WebWidgetClient.h
index 653611b93ef1a9814eeaf4a621a6f7f81d445951..0e455838e12612206d0389ceafc15d7979bc3492 100644
--- a/public/web/WebWidgetClient.h
+++ b/public/web/WebWidgetClient.h
@@ -36,6 +36,7 @@
 #include "public/platform/WebLayerTreeView.h"
 #include "public/platform/WebRect.h"
 #include "public/platform/WebScreenInfo.h"
+#include "public/web/WebTouchAction.h"
 
 namespace blink {
 
@@ -172,6 +173,10 @@ public:
     // Called to update if touch events should be sent.
     virtual void hasTouchEventHandlers(bool) { }
 
+    // Called during WebWidget::HandleInputEvent for a TouchStart event to inform the embedder
+    // of the touch actions that are permitted for this touch.
+    virtual void setTouchAction(WebTouchAction touchAction) { }
+
 protected:
     ~WebWidgetClient() { }
 };