cc : Compute visible rects dynamically (1)

cc/trees/layer_tree_impl.cc

Index: cc/trees/layer_tree_impl.cc
diff --git a/cc/trees/layer_tree_impl.cc b/cc/trees/layer_tree_impl.cc
index 1376cdf6b5ec4b19aebd7f1168b88c25d401f620..57e9e9dbf357827c26ca32432801367ffeca6e2d 100644
--- a/cc/trees/layer_tree_impl.cc
+++ b/cc/trees/layer_tree_impl.cc
@@ -920,7 +920,9 @@ void LayerTreeImpl::SetElementIdsForTesting() {
   }
 }
 
-bool LayerTreeImpl::UpdateDrawProperties(bool update_lcd_text) {
+bool LayerTreeImpl::UpdateDrawProperties(
+    bool update_lcd_text,
+    bool force_skip_verify_visible_rect_calculations) {
   if (!needs_update_draw_properties_)
     return true;
 
@@ -948,6 +950,10 @@ bool LayerTreeImpl::UpdateDrawProperties(bool update_lcd_text) {
     bool can_render_to_separate_surface =
         (!is_in_resourceless_software_draw_mode());
 
+    bool verify_visible_rect_calculations =
+        force_skip_verify_visible_rect_calculations
+            ? false
+            : settings().verify_visible_rect_calculations;
     LayerTreeHostCommon::CalcDrawPropsImplInputs inputs(
         layer_list_[0], DrawViewportSize(),
         layer_tree_host_impl_->DrawTransform(), device_scale_factor(),
@@ -958,6 +964,7 @@ bool LayerTreeImpl::UpdateDrawProperties(bool update_lcd_text) {
         can_render_to_separate_surface,
         settings().layer_transforms_should_scale_layer_contents,
         settings().verify_clip_tree_calculations,
+        verify_visible_rect_calculations,
         settings().verify_transform_tree_calculations,
         &render_surface_layer_list_, &property_trees_);
     LayerTreeHostCommon::CalculateDrawProperties(&inputs);