Delete blink::OverscrollController.

Bug: 1369739
Change-Id: I4472ce48aed760a4b45521d0094cc88fb8003a3f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4930272
Commit-Queue: Steve Kobes <skobes@chromium.org>
Reviewed-by: David Awogbemila <awogbemila@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1208886}

third_party/blink/renderer/core/dom/document.cc

@@ -292,7 +292,6 @@
 #include "third_party/blink/renderer/core/page/plugin_script_forbidden_scope.h"
 #include "third_party/blink/renderer/core/page/pointer_lock_controller.h"
 #include "third_party/blink/renderer/core/page/scrolling/fragment_anchor.h"
-#include "third_party/blink/renderer/core/page/scrolling/overscroll_controller.h"
 #include "third_party/blink/renderer/core/page/scrolling/root_scroller_controller.h"
 #include "third_party/blink/renderer/core/page/scrolling/scrolling_coordinator.h"
 #include "third_party/blink/renderer/core/page/scrolling/snap_coordinator.h"

third_party/blink/renderer/core/input/scroll_manager.cc

@@ -27,7 +27,6 @@
 #include "third_party/blink/renderer/core/page/autoscroll_controller.h"
 #include "third_party/blink/renderer/core/page/chrome_client.h"
 #include "third_party/blink/renderer/core/page/page.h"
-#include "third_party/blink/renderer/core/page/scrolling/overscroll_controller.h"
 #include "third_party/blink/renderer/core/page/scrolling/root_scroller_controller.h"
 #include "third_party/blink/renderer/core/page/scrolling/scroll_state.h"
 #include "third_party/blink/renderer/core/page/scrolling/scrolling_coordinator.h"
@@ -50,7 +49,7 @@ void ScrollManager::Clear() {
   scrollbar_handling_scroll_gesture_ = nullptr;
   resize_scrollable_area_ = nullptr;
   offset_from_resize_corner_ = {};
-  ClearGestureScrollState();
+  scroll_gesture_handling_node_ = nullptr;
 }
 
 void ScrollManager::Trace(Visitor* visitor) const {
@@ -60,16 +59,6 @@ void ScrollManager::Trace(Visitor* visitor) const {
   visitor->Trace(resize_scrollable_area_);
 }
 
-void ScrollManager::ClearGestureScrollState() {
-  scroll_gesture_handling_node_ = nullptr;
-
-  if (Page* page = frame_->GetPage()) {
-    bool reset_x = true;
-    bool reset_y = true;
-    page->GetOverscrollController().ResetAccumulated(reset_x, reset_y);
-  }
-}
-
 void ScrollManager::StopAutoscroll() {
   if (AutoscrollController* controller = GetAutoscrollController())
     controller->StopAutoscroll();
@@ -456,7 +445,6 @@ WebInputEventResult ScrollManager::HandleGestureScrollEvent(
       return WebInputEventResult::kNotHandled;
     }
 
-    ClearGestureScrollState();
     scroll_gesture_handling_node_ = event_target;
   }
 

third_party/blink/renderer/core/input/scroll_manager.h

@@ -113,8 +113,6 @@ class CORE_EXPORT ScrollManager : public GarbageCollected<ScrollManager> {
   Node* NodeTargetForScrollableAreaElementId(
       CompositorElementId scrollable_area_element_id) const;
 
-  void ClearGestureScrollState();
-
   bool HandleScrollGestureOnResizer(Node*, const WebGestureEvent&);
 
   void RecomputeScrollChain(const Node& start_node,

third_party/blink/renderer/core/page/build.gni

@@ -70,8 +70,6 @@ blink_core_sources_page = [
   "scrolling/element_fragment_anchor.h",
   "scrolling/fragment_anchor.cc",
   "scrolling/fragment_anchor.h",
-  "scrolling/overscroll_controller.cc",
-  "scrolling/overscroll_controller.h",
   "scrolling/root_scroller_controller.cc",
   "scrolling/root_scroller_controller.h",
   "scrolling/scroll_state.cc",

third_party/blink/renderer/core/page/page.cc

@@ -74,7 +74,6 @@
 #include "third_party/blink/renderer/core/page/pointer_lock_controller.h"
 #include "third_party/blink/renderer/core/page/scoped_browsing_context_group_pauser.h"
 #include "third_party/blink/renderer/core/page/scoped_page_pauser.h"
-#include "third_party/blink/renderer/core/page/scrolling/overscroll_controller.h"
 #include "third_party/blink/renderer/core/page/scrolling/scrolling_coordinator.h"
 #include "third_party/blink/renderer/core/page/scrolling/top_document_root_scroller_controller.h"
 #include "third_party/blink/renderer/core/page/spatial_navigation_controller.h"
@@ -213,9 +212,6 @@ Page::Page(base::PassKey<Page>,
       global_root_scroller_controller_(
           MakeGarbageCollected<TopDocumentRootScrollerController>(*this)),
       visual_viewport_(MakeGarbageCollected<VisualViewport>(*this)),
-      overscroll_controller_(
-          MakeGarbageCollected<OverscrollController>(GetVisualViewport(),
-                                                     GetChromeClient())),
       link_highlight_(MakeGarbageCollected<LinkHighlight>(*this)),
       plugin_data_(nullptr),
       // TODO(pdr): Initialize |validation_message_client_| lazily.
@@ -331,14 +327,6 @@ const VisualViewport& Page::GetVisualViewport() const {
   return *visual_viewport_;
 }
 
-OverscrollController& Page::GetOverscrollController() {
-  return *overscroll_controller_;
-}
-
-const OverscrollController& Page::GetOverscrollController() const {
-  return *overscroll_controller_;
-}
-
 LinkHighlight& Page::GetLinkHighlight() {
   return *link_highlight_;
 }
@@ -957,7 +945,6 @@ void Page::Trace(Visitor* visitor) const {
   visitor->Trace(console_message_storage_);
   visitor->Trace(global_root_scroller_controller_);
   visitor->Trace(visual_viewport_);
-  visitor->Trace(overscroll_controller_);
   visitor->Trace(link_highlight_);
   visitor->Trace(spatial_navigation_controller_);
   visitor->Trace(main_frame_);

third_party/blink/renderer/core/page/page.h

@@ -81,7 +81,6 @@ class LinkHighlight;
 class LocalFrame;
 class LocalFrameView;
 class MediaFeatureOverrides;
-class OverscrollController;
 class PageAnimator;
 struct PageScaleConstraints;
 class PageScaleConstraintsSet;
@@ -258,9 +257,6 @@ class CORE_EXPORT Page final : public GarbageCollected<Page>,
 
   LinkHighlight& GetLinkHighlight();
 
-  OverscrollController& GetOverscrollController();
-  const OverscrollController& GetOverscrollController() const;
-
   void SetTabKeyCyclesThroughElements(bool b) {
     tab_key_cycles_through_elements_ = b;
   }
@@ -514,7 +510,6 @@ class CORE_EXPORT Page final : public GarbageCollected<Page>,
   const Member<TopDocumentRootScrollerController>
       global_root_scroller_controller_;
   const Member<VisualViewport> visual_viewport_;
-  const Member<OverscrollController> overscroll_controller_;
   const Member<LinkHighlight> link_highlight_;
   Member<SpatialNavigationController> spatial_navigation_controller_;
 

third_party/blink/renderer/core/page/scrolling/top_document_root_scroller_controller.cc

@@ -15,7 +15,6 @@
 #include "third_party/blink/renderer/core/layout/layout_view.h"
 #include "third_party/blink/renderer/core/page/chrome_client.h"
 #include "third_party/blink/renderer/core/page/page.h"
-#include "third_party/blink/renderer/core/page/scrolling/overscroll_controller.h"
 #include "third_party/blink/renderer/core/paint/paint_layer.h"
 #include "third_party/blink/renderer/core/paint/paint_layer_scrollable_area.h"
 #include "third_party/blink/renderer/core/scroll/scrollable_area.h"