Re-route Touchscreen GesturePinch events to root view.

content/browser/renderer_host/render_widget_host_impl.h

Index: content/browser/renderer_host/render_widget_host_impl.h
diff --git a/content/browser/renderer_host/render_widget_host_impl.h b/content/browser/renderer_host/render_widget_host_impl.h
index fad138cd84d910dfb561cfc29647bcf7195ed545..473d0ee647b44d2d2e08b2cbccb54cc99db97a0b 100644
--- a/content/browser/renderer_host/render_widget_host_impl.h
+++ b/content/browser/renderer_host/render_widget_host_impl.h
@@ -263,6 +263,12 @@ class CONTENT_EXPORT RenderWidgetHostImpl : public RenderWidgetHost,
   // Notifies the RenderWidgetHost that the View was destroyed.
   void ViewDestroyed();
 
+  // Signals if this host has forwarded a GestureScrollBegin without yet having
+  // forwarded a matching GestureScrollEnd/GestureFlingStart.
+  bool is_in_touchscreen_gesture_scroll() const {
+    return is_in_touchscreen_gesture_scroll_;
+  }
+
 #if defined(OS_MACOSX)
   // Pause for a moment to wait for pending repaint or resize messages sent to
   // the renderer to arrive. If pending resize messages are for an old window