Remove all fling related stuff from the renderer assuming that browser side

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 <algorithm>
 #include <limits>
 
 #include "base/basictypes.h"
@@ skipping 847 matching lines @@
   // If we're making a frame to draw, it better have at least one render pass.
   DCHECK(!frame->render_passes.empty());
 
   // Should only have one render pass in resourceless software mode.
   if (output_surface_->ForcedDrawToSoftwareDevice())
     DCHECK_EQ(1u, frame->render_passes.size());
 
   return draw_frame;
 }
 
-void LayerTreeHostImpl::MainThreadHasStoppedFlinging() {
-  if (input_handler_client_)
-    input_handler_client_->MainThreadHasStoppedFlinging();
-}
-
 void LayerTreeHostImpl::UpdateBackgroundAnimateTicking(
     bool should_background_tick) {
   DCHECK(proxy_->IsImplThread());
   if (should_background_tick)
     DCHECK(active_tree_->root_layer());
 
   bool enabled = should_background_tick &&
                  !animation_registrar_->active_animation_controllers().empty();
 
   // Lazily create the time_source adapter so that we can vary the interval for
@@ skipping 552 matching lines @@
 
 LayerImpl* LayerTreeHostImpl::RootScrollLayer() const {
   return active_tree_->RootScrollLayer();
 }
 
 LayerImpl* LayerTreeHostImpl::CurrentlyScrollingLayer() const {
   return active_tree_->CurrentlyScrollingLayer();
 }
 
 bool LayerTreeHostImpl::IsCurrentlyScrolling() const {
-  return CurrentlyScrollingLayer() ||
-         (RootScrollLayer() && RootScrollLayer()->IsExternalFlingActive());
+  return CurrentlyScrollingLayer();
 }
 
 // Content layers can be either directly scrollable or contained in an outer
 // scrolling layer which applies the scroll transform. Given a content layer,
 // this function returns the associated scroll layer if any.
 static LayerImpl* FindScrollLayerForContentLayer(LayerImpl* layer_impl) {
   if (!layer_impl)
     return NULL;
 
   if (layer_impl->scrollable())
@@ skipping 714 matching lines @@
     accumulated_root_overscroll_.set_x(0);
   if (did_scroll_y)
     accumulated_root_overscroll_.set_y(0);
 
   accumulated_root_overscroll_ += unused_root_delta;
   bool did_overscroll = !gfx::ToRoundedVector2d(unused_root_delta).IsZero();
   if (did_overscroll && input_handler_client_) {
     DidOverscrollParams params;
     params.accumulated_overscroll = accumulated_root_overscroll_;
     params.latest_overscroll_delta = unused_root_delta;
-    params.current_fling_velocity = current_fling_velocity_;
     input_handler_client_->DidOverscroll(params);
   }
 
   return did_scroll;
 }
 
 // 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(gfx::Point viewport_point,
@@ skipping 43 matching lines @@
 
 void LayerTreeHostImpl::OnRootLayerDelegatedScrollOffsetChanged() {
   DCHECK(root_layer_scroll_offset_delegate_ != NULL);
   client_->SetNeedsCommitOnImplThread();
 }
 
 void LayerTreeHostImpl::ClearCurrentlyScrollingLayer() {
   active_tree_->ClearCurrentlyScrollingLayer();
   did_lock_scrolling_layer_ = false;
   accumulated_root_overscroll_ = gfx::Vector2dF();
-  current_fling_velocity_ = gfx::Vector2dF();
 }
 
 void LayerTreeHostImpl::ScrollEnd() {
   if (top_controls_manager_)
     top_controls_manager_->ScrollEnd();
   ClearCurrentlyScrollingLayer();
   StartScrollbarAnimation();
 }
 
-InputHandler::ScrollStatus LayerTreeHostImpl::FlingScrollBegin() {
-  if (!active_tree_->CurrentlyScrollingLayer())
-    return ScrollIgnored;
-
-  if (settings_.ignore_root_layer_flings &&
-      active_tree_->CurrentlyScrollingLayer() ==
-          active_tree_->RootScrollLayer()) {
-    ClearCurrentlyScrollingLayer();
-    return ScrollIgnored;
-  }
-
-  if (!wheel_scrolling_)
-    should_bubble_scrolls_ = last_scroll_did_bubble_;
-
-  return ScrollStarted;
-}
-
-void LayerTreeHostImpl::NotifyCurrentFlingVelocity(gfx::Vector2dF velocity) {
-  current_fling_velocity_ = velocity;
-}
-
 float LayerTreeHostImpl::DeviceSpaceDistanceToLayer(
     gfx::PointF device_viewport_point,
     LayerImpl* layer_impl) {
   if (!layer_impl)
     return std::numeric_limits<float>::max();
 
   gfx::Rect layer_impl_bounds(
       layer_impl->content_bounds());
 
   gfx::RectF device_viewport_layer_impl_bounds = MathUtil::MapClippedRect(
@@ skipping 527 matching lines @@
   std::set<UIResourceId>::iterator found_in_evicted =
       evicted_ui_resources_.find(uid);
   if (found_in_evicted == evicted_ui_resources_.end())
     return;
   evicted_ui_resources_.erase(found_in_evicted);
   if (evicted_ui_resources_.empty())
     client_->OnCanDrawStateChanged(CanDraw());
 }
 
 }  // namespace cc