cc: Change required_for_activation bookkeeping.

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 679e0e76a083e0fb2b4a9034928d589b80717ce8..98b508532bdb95486d5b74f417a3150718192bbc 100644
--- a/cc/trees/layer_tree_host_impl.cc
+++ b/cc/trees/layer_tree_host_impl.cc
@@ -1216,6 +1216,24 @@ void LayerTreeHostImpl::NotifyReadyToActivate() {
   client_->NotifyReadyToActivate();
 }
 
+void LayerTreeHostImpl::NotifyTileInitialized(const Tile* tile) {
+  TRACE_EVENT0("cc", "LayerTreeHostImpl::NotifyTileInitialized");
+
+  if (active_tree_) {
+    LayerImpl* layer_impl =
+        active_tree_->FindActiveTreeLayerById(tile->layer_id());
+    if (layer_impl)
+      layer_impl->NotifyTileInitialized(tile);
+  }
+
+  if (pending_tree_) {
+    LayerImpl* layer_impl =
+        pending_tree_->FindPendingTreeLayerById(tile->layer_id());
+    if (layer_impl)
+      layer_impl->NotifyTileInitialized(tile);
+  }
+}
+
 void LayerTreeHostImpl::SetMemoryPolicy(const ManagedMemoryPolicy& policy) {
   SetManagedMemoryPolicy(policy, zero_budget_);
 }