Keeping track of descendants that draw content instead of recalcualting

cc/layers/texture_layer.cc

Index: cc/layers/texture_layer.cc
diff --git a/cc/layers/texture_layer.cc b/cc/layers/texture_layer.cc
index 05391fe5d637bf8a93c2cd4ae8b1dac11ff643ac..b21859c3f00e6d4aa92824e9b343d87fb7896221 100644
--- a/cc/layers/texture_layer.cc
+++ b/cc/layers/texture_layer.cc
@@ -45,6 +45,7 @@ void TextureLayer::ClearClient() {
     layer_tree_host()->StopRateLimiter();
   client_ = NULL;
   ClearTexture();
+  UpdateDrawsContent(true);
 }
 
 void TextureLayer::ClearTexture() {
@@ -136,6 +137,7 @@ void TextureLayer::SetTextureMailboxInternal(
   else
     SetNeedsPushProperties();
 
+  UpdateDrawsContent(true);
   // The active frame needs to be replaced and the mailbox returned before the
   // commit is called complete.
   SetNextCommitWaitsForActivation();
@@ -198,8 +200,8 @@ void TextureLayer::SetLayerTreeHost(LayerTreeHost* host) {
   Layer::SetLayerTreeHost(host);
 }
 
-bool TextureLayer::DrawsContent() const {
-  return (client_ || holder_ref_) && Layer::DrawsContent();
+void TextureLayer::UpdateDrawsContent(bool draws_content) {
+  Layer::UpdateDrawsContent(draws_content && (client_ || holder_ref_));
 }
 
 bool TextureLayer::Update(ResourceUpdateQueue* queue,