cc: Compute target space transform dynamically

cc/trees/property_tree_builder.cc

 // Copyright 2014 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/property_tree_builder.h"
 
 #include <stddef.h>
 
 #include <map>
 #include <set>
@@ skipping 1388 matching lines @@
     const Layer* outer_viewport_scroll_layer,
     const Layer* overscroll_elasticity_layer,
     const gfx::Vector2dF& elastic_overscroll,
     float page_scale_factor,
     float device_scale_factor,
     const gfx::Rect& viewport,
     const gfx::Transform& device_transform,
     PropertyTrees* property_trees) {
   property_trees->is_main_thread = true;
   property_trees->is_active = false;
+  property_trees->verify_transform_tree_calculations =
+      root_layer->layer_tree_host()
+          ->settings()
+          .verify_transform_tree_calculations;
   SkColor color = root_layer->layer_tree_host()->background_color();
   if (SkColorGetA(color) != 255)
     color = SkColorSetA(color, 255);
   BuildPropertyTreesTopLevelInternal(
       root_layer, page_scale_layer, inner_viewport_scroll_layer,
       outer_viewport_scroll_layer, overscroll_elasticity_layer,
       elastic_overscroll, page_scale_factor, device_scale_factor, viewport,
       device_transform, property_trees, color);
 #if DCHECK_IS_ON()
   for (auto* layer : *root_layer->layer_tree_host())
     CheckScrollAndClipPointersForLayer(layer);
 #endif
+  property_trees->ResetCachedData();
 }
 
 void PropertyTreeBuilder::BuildPropertyTrees(
     LayerImpl* root_layer,
     const LayerImpl* page_scale_layer,
     const LayerImpl* inner_viewport_scroll_layer,
     const LayerImpl* outer_viewport_scroll_layer,
     const LayerImpl* overscroll_elasticity_layer,
     const gfx::Vector2dF& elastic_overscroll,
     float page_scale_factor,
     float device_scale_factor,
     const gfx::Rect& viewport,
     const gfx::Transform& device_transform,
     PropertyTrees* property_trees) {
   property_trees->is_main_thread = false;
   property_trees->is_active = root_layer->IsActive();
+  property_trees->verify_transform_tree_calculations =
+      root_layer->layer_tree_impl()
+          ->settings()
+          .verify_transform_tree_calculations;
   SkColor color = root_layer->layer_tree_impl()->background_color();
   if (SkColorGetA(color) != 255)
     color = SkColorSetA(color, 255);
   BuildPropertyTreesTopLevelInternal(
       root_layer, page_scale_layer, inner_viewport_scroll_layer,
       outer_viewport_scroll_layer, overscroll_elasticity_layer,
       elastic_overscroll, page_scale_factor, device_scale_factor, viewport,
       device_transform, property_trees, color);
   property_trees->ResetCachedData();
 }
 
 }  // namespace cc