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

ui/android/overscroll_refresh.cc

 // Copyright 2014 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 "ui/android/overscroll_refresh.h"
 
 #include "base/logging.h"
 #include "ui/android/overscroll_refresh_handler.h"
 
 namespace ui {
 namespace {
 
 // Experimentally determined constant used to allow activation even if touch
 // release results in a small upward fling (quite common during a slow scroll).
 const float kMinFlingVelocityForActivation = -500.f;
 
 }  // namespace
 
 OverscrollRefresh::OverscrollRefresh(OverscrollRefreshHandler* handler)
     : scrolled_to_top_(true),
       overflow_y_hidden_(false),
       scroll_consumption_state_(DISABLED),
       handler_(handler) {
   DCHECK(handler);
 }
 
+OverscrollRefresh::OverscrollRefresh()
+    : scrolled_to_top_(true),
+      overflow_y_hidden_(false),
+      scroll_consumption_state_(DISABLED),
+      handler_(nullptr) {}
+
 OverscrollRefresh::~OverscrollRefresh() {
 }
 
 void OverscrollRefresh::Reset() {
   scroll_consumption_state_ = DISABLED;
   handler_->PullReset();
 }
 
 void OverscrollRefresh::OnScrollBegin() {
   ReleaseWithoutActivation();
   if (scrolled_to_top_ && !overflow_y_hidden_)
     scroll_consumption_state_ = AWAITING_SCROLL_UPDATE_ACK;
 }
 
 void OverscrollRefresh::OnScrollEnd(const gfx::Vector2dF& scroll_velocity) {
   bool allow_activation = scroll_velocity.y() > kMinFlingVelocityForActivation;
   Release(allow_activation);
 }
 
-void OverscrollRefresh::OnScrollUpdateAck(bool was_consumed) {
+void OverscrollRefresh::OnOverscrolled() {
   if (scroll_consumption_state_ != AWAITING_SCROLL_UPDATE_ACK)
     return;
 
-  if (was_consumed) {
-    scroll_consumption_state_ = DISABLED;
-    return;
-  }
-
   scroll_consumption_state_ = handler_->PullStart() ? ENABLED : DISABLED;
 }
 
 bool OverscrollRefresh::WillHandleScrollUpdate(
     const gfx::Vector2dF& scroll_delta) {
   switch (scroll_consumption_state_) {
     case DISABLED:
       return false;
 
     case AWAITING_SCROLL_UPDATE_ACK:
@@ skipping 31 matching lines @@
   overflow_y_hidden_ = root_overflow_y_hidden;
 }
 
 void OverscrollRefresh::Release(bool allow_refresh) {
   if (scroll_consumption_state_ == ENABLED)
     handler_->PullRelease(allow_refresh);
   scroll_consumption_state_ = DISABLED;
 }
 
 }  // namespace ui