Force use of and cache render surface.

cc/layers/render_surface_impl.cc

Index: cc/layers/render_surface_impl.cc
diff --git a/cc/layers/render_surface_impl.cc b/cc/layers/render_surface_impl.cc
index 1f03887ae097792581e13ae5960ca5d0355ce7d8..0d8acae0aaa3b10c2b7635e12a5a664d58aaeb9c 100644
--- a/cc/layers/render_surface_impl.cc
+++ b/cc/layers/render_surface_impl.cc
@@ -152,6 +152,10 @@ bool RenderSurfaceImpl::HasCopyRequest() const {
   return OwningEffectNode()->has_copy_request;
 }
 
+bool RenderSurfaceImpl::ShouldCacheRenderSurface() const {
+  return OwningEffectNode()->cache_render_surface;
+}
+
 int RenderSurfaceImpl::TransformTreeIndex() const {
   return OwningEffectNode()->transform_id;
 }
@@ -201,7 +205,7 @@ gfx::Rect RenderSurfaceImpl::CalculateExpandedClipForFilters(
 }
 
 gfx::Rect RenderSurfaceImpl::CalculateClippedAccumulatedContentRect() {
-  if (HasCopyRequest() || !is_clipped())
+  if (ShouldCacheRenderSurface() || HasCopyRequest() || !is_clipped())
     return accumulated_content_rect();
 
   if (accumulated_content_rect().IsEmpty())
@@ -336,6 +340,10 @@ void RenderSurfaceImpl::NoteAncestorPropertyChanged() {
   ancestor_property_changed_ = true;
 }
 
+bool RenderSurfaceImpl::HasDamageFromeContributingContent() const {
+  return damage_tracker_->has_damage_from_contributing_content();
+}
+
 gfx::Rect RenderSurfaceImpl::GetDamageRect() const {
   gfx::Rect damage_rect;
   bool is_valid_rect = damage_tracker_->GetDamageRectIfValid(&damage_rect);
@@ -357,6 +365,9 @@ std::unique_ptr<RenderPass> RenderSurfaceImpl::CreateRenderPass() {
                draw_properties_.screen_space_transform);
   pass->filters = Filters();
   pass->background_filters = BackgroundFilters();
+  pass->cache_render_pass = ShouldCacheRenderSurface();
+  pass->has_damage_from_contributing_content =
+      HasDamageFromeContributingContent();
   return pass;
 }