Do not clip inside OcclusionTracker.

cc/trees/layer_tree_host_impl.cc

Index: cc/trees/layer_tree_host_impl.cc
diff --git a/cc/trees/layer_tree_host_impl.cc b/cc/trees/layer_tree_host_impl.cc
index 08e4ac16366b7a4e3b1de129cd5b81d1c7a994d1..7298084dd7795752d421944493caed7ba7536166 100644
--- a/cc/trees/layer_tree_host_impl.cc
+++ b/cc/trees/layer_tree_host_impl.cc
@@ -540,7 +540,8 @@ static void AppendQuadsToFillScreen(
   if (!root_layer || !SkColorGetA(screen_background_color))
     return;
 
-  Region fill_region = occlusion_tracker.ComputeVisibleRegionInScreen();
+  Region fill_region = occlusion_tracker.ComputeVisibleRegionInScreen(
+      root_layer->render_surface()->content_rect());
   if (fill_region.IsEmpty())
     return;
 
@@ -665,9 +666,7 @@ bool LayerTreeHostImpl::CalculateRenderPasses(FrameData* frame) {
       settings_.show_overdraw_in_tracing &&
       base::debug::TraceLog::GetInstance() &&
       base::debug::TraceLog::GetInstance()->IsEnabled();
-  OcclusionTrackerImpl occlusion_tracker(
-      active_tree_->root_layer()->render_surface()->content_rect(),
-      record_metrics_for_frame);
+  OcclusionTrackerImpl occlusion_tracker(record_metrics_for_frame);
   occlusion_tracker.set_minimum_tracking_size(
       settings_.minimum_occlusion_tracking_size);
 
@@ -742,8 +741,6 @@ bool LayerTreeHostImpl::CalculateRenderPasses(FrameData* frame) {
               it->visible_content_rect(),
               it->draw_transform(),
               impl_draw_transform_is_unknown,
-              it->is_clipped(),
-              it->clip_rect(),
               &has_occlusion_from_outside_target_surface)) {
         append_quads_data.had_occlusion_from_outside_target_surface |=
             has_occlusion_from_outside_target_surface;