cc: Directly use property trees to calculate clip rect

cc/trees/layer_tree_host_common.cc

Index: cc/trees/layer_tree_host_common.cc
diff --git a/cc/trees/layer_tree_host_common.cc b/cc/trees/layer_tree_host_common.cc
index 83c9c7586f3f5ce2e4790fa9bba1b8f14de862c3..8cd9c4d5bf3d713891a314561a8a4d30a463ccd2 100644
--- a/cc/trees/layer_tree_host_common.cc
+++ b/cc/trees/layer_tree_host_common.cc
@@ -80,6 +80,7 @@ LayerTreeHostCommon::CalcDrawPropsImplInputs::CalcDrawPropsImplInputs(
     bool layers_always_allowed_lcd_text,
     bool can_render_to_separate_surface,
     bool can_adjust_raster_scales,
+    bool verify_clip_tree_calculations,
     LayerImplList* render_surface_layer_list,
     int current_render_surface_layer_list_id,
     PropertyTrees* property_trees)
@@ -99,6 +100,7 @@ LayerTreeHostCommon::CalcDrawPropsImplInputs::CalcDrawPropsImplInputs(
       layers_always_allowed_lcd_text(layers_always_allowed_lcd_text),
       can_render_to_separate_surface(can_render_to_separate_surface),
       can_adjust_raster_scales(can_adjust_raster_scales),
+      verify_clip_tree_calculations(verify_clip_tree_calculations),
       render_surface_layer_list(render_surface_layer_list),
       current_render_surface_layer_list_id(
           current_render_surface_layer_list_id),
@@ -125,6 +127,7 @@ LayerTreeHostCommon::CalcDrawPropsImplInputsForTesting::
                               false,
                               true,
                               false,
+                              true,
                               render_surface_layer_list,
                               current_render_surface_layer_list_id,
                               GetPropertyTrees(root_layer)) {
@@ -1054,6 +1057,10 @@ void CalculateDrawPropertiesInternal(
       subtree_visible_from_ancestor, inputs->can_render_to_separate_surface,
       inputs->current_render_surface_layer_list_id, inputs->max_texture_size);
 
+  if (inputs->verify_clip_tree_calculations)
+    draw_property_utils::VerifyClipTreeCalculations(visible_layer_list,
+                                                    inputs->property_trees);
+
   if (should_measure_property_tree_performance) {
     TRACE_EVENT_END0(TRACE_DISABLED_BY_DEFAULT("cc.debug.cdp-perf"),
                      "LayerTreeHostCommon::CalculateDrawProperties");