Removed unused LayerTreeHostImpl::ScrollVerticallyByPage

cc/trees/layer_tree_host_impl.cc

 // Copyright 2011 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 "cc/trees/layer_tree_host_impl.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 3139 matching lines @@
     // input handler.
     UpdateRootLayerStateForSynchronousInputHandler();
   }
 
   // Update compositor worker mutations which may respond to scrolling.
   Mutate(CurrentBeginFrameArgs().frame_time);
 
   return scroll_result;
 }
 
-// This implements scrolling by page as described here:
-// http://msdn.microsoft.com/en-us/library/windows/desktop/ms645601(v=vs.85).aspx#_win32_The_Mouse_Wheel
-// for events with WHEEL_PAGESCROLL set.
-bool LayerTreeHostImpl::ScrollVerticallyByPage(const gfx::Point& viewport_point,
-                                               ScrollDirection direction) {
-  DCHECK(wheel_scrolling_);
-
-  ScrollTree& scroll_tree = active_tree_->property_trees()->scroll_tree;
-  ScrollNode* scroll_node = scroll_tree.CurrentlyScrollingNode();
-  if (scroll_node) {
-    for (; scroll_tree.parent(scroll_node);
-         scroll_node = scroll_tree.parent(scroll_node)) {
-      // The inner viewport layer represents the viewport.
-      if (!scroll_node->scrollable ||
-          scroll_node->is_outer_viewport_scroll_layer)
-        continue;
-
-      float height =
-          scroll_tree.scroll_clip_layer_bounds(scroll_node->id).height();
-
-      // These magical values match WebKit and are designed to scroll nearly the
-      // entire visible content height but leave a bit of overlap.
-      float page = std::max(height * 0.875f, 1.f);
-      if (direction == SCROLL_BACKWARD)
-        page = -page;
-
-      gfx::Vector2dF delta = gfx::Vector2dF(0.f, page);
-
-      gfx::Vector2dF applied_delta =
-          ScrollNodeWithLocalDelta(scroll_node, delta, 1.f, active_tree());
-
-      if (!applied_delta.IsZero()) {
-        client_->SetNeedsCommitOnImplThread();
-        SetNeedsRedraw();
-        client_->RenewTreePriority();
-        return true;
-      }
-
-      scroll_tree.set_currently_scrolling_node(scroll_node->id);
-    }
-  }
-  return false;
-}
-
 void LayerTreeHostImpl::RequestUpdateForSynchronousInputHandler() {
   UpdateRootLayerStateForSynchronousInputHandler();
 }
 
 void LayerTreeHostImpl::SetSynchronousInputHandlerRootScrollOffset(
     const gfx::ScrollOffset& root_offset) {
   bool changed = active_tree_->DistributeRootScrollOffset(root_offset);
   if (!changed)
     return;
 
@@ skipping 983 matching lines @@
   if (is_visible) {
     worker_context_visibility_ =
         worker_context->CacheController()->ClientBecameVisible();
   } else {
     worker_context->CacheController()->ClientBecameNotVisible(
         std::move(worker_context_visibility_));
   }
 }
 
 }  // namespace cc