Force use of and cache render surface.

cc/layers/layer.cc

Index: cc/layers/layer.cc
diff --git a/cc/layers/layer.cc b/cc/layers/layer.cc
index 23e9f79817797f7b8093827b065400d374b26ba6..b57d100c40c12e51e406b21d61ab9de7ceaa75d2 100644
--- a/cc/layers/layer.cc
+++ b/cc/layers/layer.cc
@@ -90,6 +90,7 @@ Layer::Layer()
       should_flatten_transform_from_property_tree_(false),
       draws_content_(false),
       should_check_backface_visibility_(false),
+      cache_render_surface_(false),
       force_render_surface_for_testing_(false),
       subtree_property_changed_(false),
       may_contain_video_(false),
@@ -925,6 +926,15 @@ void Layer::SetTouchActionRegion(TouchActionRegion touch_action_region) {
   SetNeedsCommit();
 }
 
+void Layer::SetCacheRenderSurface(bool cache) {
+  DCHECK(IsPropertyChangeAllowed());
+  if (cache_render_surface_ == cache)
+    return;
+  cache_render_surface_ = cache;
+  SetPropertyTreesNeedRebuild();
+  SetNeedsCommit();
+}
+
 void Layer::SetForceRenderSurfaceForTesting(bool force) {
   DCHECK(IsPropertyChangeAllowed());
   if (force_render_surface_for_testing_ == force)