Use scroll-boundary-behavior to control overscroll-refresh/glow on android.

third_party/WebKit/Source/core/input/ScrollManager.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/input/ScrollManager.h"
 
 #include <memory>
 #include "core/dom/DOMNodeIds.h"
 #include "core/dom/NodeComputedStyle.h"
 #include "core/events/GestureEvent.h"
@@ skipping 67 matching lines @@
   return GetAutoscrollController() &&
          GetAutoscrollController()->MiddleClickAutoscrollInProgress();
 }
 
 AutoscrollController* ScrollManager::GetAutoscrollController() const {
   if (Page* page = frame_->GetPage())
     return &page->GetAutoscrollController();
   return nullptr;
 }
 
-static bool CanPropagate(const ScrollState& scroll_state,
-                         const Element& element) {
+bool ScrollManager::CanPropagate(const ScrollState& scroll_state,
+                                 const Element& element) {
   // ScrollBoundaryBehavior may have different values on x-axis and y-axis.
   // We need to find out the dominant axis of user's intended scroll to decide
   // which node's ScrollBoundaryBehavior should be applied, i.e. which the
   // scroll should be propagated from this node given its relevant*
   // ScrollBoundaryBehavior value. * relevant here depends on the dominant
   // axis of scroll gesture.
   bool x_dominant =
       std::abs(scroll_state.deltaXHint()) > std::abs(scroll_state.deltaYHint());
-  return (x_dominant && element.GetComputedStyle()->ScrollBoundaryBehaviorX() ==
+  return (element == frame_->GetDocument()->ViewportDefiningElement(nullptr)) ||
+         (x_dominant && element.GetComputedStyle()->ScrollBoundaryBehaviorX() ==
                             EScrollBoundaryBehavior::kAuto) ||
          (!x_dominant &&
           element.GetComputedStyle()->ScrollBoundaryBehaviorY() ==
               EScrollBoundaryBehavior::kAuto);
 }
 
 void ScrollManager::RecomputeScrollChain(const Node& start_node,
                                          const ScrollState& scroll_state,
                                          std::deque<int>& scroll_chain) {
   DCHECK(!scroll_chain.size());
@@ skipping 614 matching lines @@
                                 &should_update_capture)) {
       if (should_update_capture)
         scrollbar_handling_scroll_gesture_ = scrollbar;
       return true;
     }
   }
   return false;
 }
 
 }  // namespace blink