cc: Remove LayerTreeImpl::root_layer usage outside tests

cc/debug/debug_rect_history.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/debug/debug_rect_history.h"
 
 #include <stddef.h>
 
 #include "base/memory/ptr_util.h"
 #include "cc/base/math_util.h"
@@ skipping 13 matching lines @@
 // static
 std::unique_ptr<DebugRectHistory> DebugRectHistory::Create() {
   return base::WrapUnique(new DebugRectHistory());
 }
 
 DebugRectHistory::DebugRectHistory() {}
 
 DebugRectHistory::~DebugRectHistory() {}
 
 void DebugRectHistory::SaveDebugRectsForCurrentFrame(
-    LayerImpl* root_layer,
+    LayerTreeImpl* tree_impl,
     LayerImpl* hud_layer,
     const LayerImplList& render_surface_layer_list,
     const LayerTreeDebugState& debug_state) {
   // For now, clear all rects from previous frames. In the future we may want to
   // store all debug rects for a history of many frames.
   debug_rects_.clear();
 
   if (debug_state.show_touch_event_handler_rects)
-    SaveTouchEventHandlerRects(root_layer->layer_tree_impl());
+    SaveTouchEventHandlerRects(tree_impl);
 
   if (debug_state.show_wheel_event_handler_rects)
-    SaveWheelEventHandlerRects(root_layer);
+    SaveWheelEventHandlerRects(tree_impl);
 
   if (debug_state.show_scroll_event_handler_rects)
-    SaveScrollEventHandlerRects(root_layer->layer_tree_impl());
+    SaveScrollEventHandlerRects(tree_impl);
 
   if (debug_state.show_non_fast_scrollable_rects)
-    SaveNonFastScrollableRects(root_layer->layer_tree_impl());
+    SaveNonFastScrollableRects(tree_impl);
 
   if (debug_state.show_paint_rects)
-    SavePaintRects(root_layer);
+    SavePaintRects(tree_impl);
 
   if (debug_state.show_property_changed_rects)
     SavePropertyChangedRects(render_surface_layer_list, hud_layer);
 
   if (debug_state.show_surface_damage_rects)
     SaveSurfaceDamageRects(render_surface_layer_list);
 
   if (debug_state.show_screen_space_rects)
     SaveScreenSpaceRects(render_surface_layer_list);
 
   if (debug_state.show_layer_animation_bounds_rects)
     SaveLayerAnimationBoundsRects(render_surface_layer_list);
 }
 
-void DebugRectHistory::SavePaintRects(LayerImpl* root_layer) {
+void DebugRectHistory::SavePaintRects(LayerTreeImpl* tree_impl) {
   // We would like to visualize where any layer's paint rect (update rect) has
   // changed, regardless of whether this layer is skipped for actual drawing or
   // not. Therefore we traverse over all layers, not just the render surface
   // list.
-  for (auto* layer : *root_layer->layer_tree_impl()) {
+  for (auto* layer : *tree_impl) {
     Region invalidation_region = layer->GetInvalidationRegionForDebugging();
     if (invalidation_region.IsEmpty() || !layer->DrawsContent())
       continue;
 
     for (Region::Iterator it(invalidation_region); it.has_rect(); it.next()) {
       debug_rects_.push_back(DebugRect(
           PAINT_RECT_TYPE, MathUtil::MapEnclosingClippedRect(
                                layer->ScreenSpaceTransform(), it.rect())));
     }
   }
@@ skipping 81 matching lines @@
   for (Region::Iterator iter(layer->touch_event_handler_region());
        iter.has_rect();
        iter.next()) {
     debug_rects_.push_back(
         DebugRect(TOUCH_EVENT_HANDLER_RECT_TYPE,
                   MathUtil::MapEnclosingClippedRect(
                       layer->ScreenSpaceTransform(), iter.rect())));
   }
 }
 
-void DebugRectHistory::SaveWheelEventHandlerRects(LayerImpl* root_layer) {
+void DebugRectHistory::SaveWheelEventHandlerRects(LayerTreeImpl* tree_impl) {
   EventListenerProperties event_properties =
-      root_layer->layer_tree_impl()->event_listener_properties(
-          EventListenerClass::kMouseWheel);
+      tree_impl->event_listener_properties(EventListenerClass::kMouseWheel);
   if (event_properties == EventListenerProperties::kNone ||
       event_properties == EventListenerProperties::kPassive) {
     return;
   }
 
   // Since the wheel event handlers property is on the entire layer tree just
   // mark inner viewport if have listeners.
-  LayerImpl* inner_viewport =
-      root_layer->layer_tree_impl()->InnerViewportScrollLayer();
+  LayerImpl* inner_viewport = tree_impl->InnerViewportScrollLayer();
   if (!inner_viewport)
     return;
   debug_rects_.push_back(DebugRect(
       WHEEL_EVENT_HANDLER_RECT_TYPE,
       MathUtil::MapEnclosingClippedRect(inner_viewport->ScreenSpaceTransform(),
                                         gfx::Rect(inner_viewport->bounds()))));
 }
 
 void DebugRectHistory::SaveScrollEventHandlerRects(LayerTreeImpl* tree_impl) {
   LayerTreeHostCommon::CallFunctionForEveryLayer(
@@ skipping 45 matching lines @@
     debug_rects_.push_back(
         DebugRect(ANIMATION_BOUNDS_RECT_TYPE,
                   gfx::ToEnclosingRect(gfx::RectF(inflated_bounds.x(),
                                                   inflated_bounds.y(),
                                                   inflated_bounds.width(),
                                                   inflated_bounds.height()))));
   }
 }
 
 }  // namespace cc