Move second internal recursion to a precomputation in layer_tree_host_common.cc

cc/delegated_renderer_layer_impl.cc

Index: cc/delegated_renderer_layer_impl.cc
diff --git a/cc/delegated_renderer_layer_impl.cc b/cc/delegated_renderer_layer_impl.cc
index 5902567ca99925b5913d2cd24562fb76afc0785b..a8c930f318b6f56d2c82c4e9a3c50ffe3bdd75c0 100644
--- a/cc/delegated_renderer_layer_impl.cc
+++ b/cc/delegated_renderer_layer_impl.cc
@@ -22,14 +22,9 @@ DelegatedRendererLayerImpl::~DelegatedRendererLayerImpl()
     clearRenderPasses();
 }
 
-int DelegatedRendererLayerImpl::descendantsDrawContent()
+bool DelegatedRendererLayerImpl::hasDelegatedContent() const
 {
-    // FIXME: This could possibly return false even though there are some
-    // quads present as they could all be from a single layer (or set of
-    // layers without children). If this happens, then make a test that
-    // ensures the opacity is being changed on quads in the root RenderPass
-    // when this layer doesn't own a RenderSurfaceImpl.
-    return m_renderPassesInDrawOrder.isEmpty() ? 0 : 2;
+    return !m_renderPassesInDrawOrder.isEmpty();
 }
 
 bool DelegatedRendererLayerImpl::hasContributingDelegatedRenderPasses() const