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

ui/android/overscroll_refresh.cc

Index: ui/android/overscroll_refresh.cc
diff --git a/ui/android/overscroll_refresh.cc b/ui/android/overscroll_refresh.cc
index 2f2af62d8cd56abe468ecb688e0675fa140b8ccc..e42d6aebfbac330491b06904f3973320ac942058 100644
--- a/ui/android/overscroll_refresh.cc
+++ b/ui/android/overscroll_refresh.cc
@@ -20,15 +20,14 @@ OverscrollRefresh::OverscrollRefresh(OverscrollRefreshHandler* handler)
     : scrolled_to_top_(true),
       overflow_y_hidden_(false),
       scroll_consumption_state_(DISABLED),
-      handler_(handler) {
-  DCHECK(handler);
-}
+      handler_(handler) {}
 
 OverscrollRefresh::~OverscrollRefresh() {
 }
 
 void OverscrollRefresh::Reset() {
   scroll_consumption_state_ = DISABLED;
+  DCHECK(handler_);
   handler_->PullReset();
 }
 
@@ -43,15 +42,16 @@ void OverscrollRefresh::OnScrollEnd(const gfx::Vector2dF& scroll_velocity) {
   Release(allow_activation);
 }
 
-void OverscrollRefresh::OnScrollUpdateAck(bool was_consumed) {
+void OverscrollRefresh::OnOverscrolled(bool can_navigate) {
   if (scroll_consumption_state_ != AWAITING_SCROLL_UPDATE_ACK)
     return;
 
-  if (was_consumed) {
+  if (!can_navigate) {
     scroll_consumption_state_ = DISABLED;
     return;
   }
 
+  DCHECK(handler_);
   scroll_consumption_state_ = handler_->PullStart() ? ENABLED : DISABLED;
 }
 
@@ -68,6 +68,7 @@ bool OverscrollRefresh::WillHandleScrollUpdate(
       return false;
 
     case ENABLED:
+      DCHECK(handler_);
       handler_->PullUpdate(scroll_delta.y());
       return true;
   }
@@ -97,8 +98,10 @@ void OverscrollRefresh::OnFrameUpdated(
 }
 
 void OverscrollRefresh::Release(bool allow_refresh) {
-  if (scroll_consumption_state_ == ENABLED)
+  if (scroll_consumption_state_ == ENABLED) {
+    DCHECK(handler_);
     handler_->PullRelease(allow_refresh);
+  }
   scroll_consumption_state_ = DISABLED;
 }