Unify Android Webview and Chrome's fling

cc/layers/layer_impl.cc

 // Copyright 2012 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/layers/layer_impl.h"
 
 #include "base/json/json_reader.h"
 #include "base/strings/stringprintf.h"
 #include "base/trace_event/trace_event.h"
 #include "base/trace_event/trace_event_argument.h"
@@ skipping 1139 matching lines @@
                                  float contents_scale_y) {
   if (this->contents_scale_x() == contents_scale_x &&
       this->contents_scale_y() == contents_scale_y)
     return;
 
   draw_properties_.contents_scale_x = contents_scale_x;
   draw_properties_.contents_scale_y = contents_scale_y;
   NoteLayerPropertyChanged();
 }
 
-bool LayerImpl::IsExternalFlingActive() const {
-  return layer_tree_impl_->IsExternalFlingActive();
+bool LayerImpl::IsExternalScrollActive() const {
+  return layer_tree_impl_->IsExternalScrollActive();
 }
 
 void LayerImpl::SetCurrentScrollOffset(const gfx::ScrollOffset& scroll_offset) {
   DCHECK(IsActive());
   if (scroll_offset_->SetCurrent(scroll_offset))
     DidUpdateScrollOffset(false);
 }
 
 void LayerImpl::SetCurrentScrollOffsetFromDelegate(
     const gfx::ScrollOffset& scroll_offset) {
@@ skipping 509 matching lines @@
   gfx::Transform scaled_draw_transform =
       draw_properties_.target_space_transform;
   scaled_draw_transform.Scale(SK_MScalar1 / scale, SK_MScalar1 / scale);
   gfx::Size scaled_content_bounds =
       gfx::ToCeiledSize(gfx::ScaleSize(content_bounds(), scale));
   return MathUtil::MapEnclosingClippedRect(scaled_draw_transform,
                                            gfx::Rect(scaled_content_bounds));
 }
 
 }  // namespace cc