Move second internal recursion to a precomputation in layer_tree_host_common.cc

cc/layer.cc

Index: cc/layer.cc
diff --git a/cc/layer.cc b/cc/layer.cc
index 242ad765ed55ec51053e471195c8530c80ad0e2e..5ae5f2735799f3cde5892e61e4e452641658c547 100644
--- a/cc/layer.cc
+++ b/cc/layer.cc
@@ -64,6 +64,7 @@ Layer::Layer()
     , m_rasterScale(1.0)
     , m_automaticallyComputeRasterScale(false)
     , m_boundsContainPageScale(false)
+    , m_numDescendantsThatDrawContent(0)
     , m_layerAnimationDelegate(0)
     , m_layerScrollClient(0)
 {
@@ -698,19 +699,6 @@ void Layer::createRenderSurface()
     setRenderTarget(this);
 }
 
-int Layer::descendantsDrawContent()
-{
-    int result = 0;
-    for (size_t i = 0; i < m_children.size(); ++i) {
-        if (m_children[i]->drawsContent())
-            ++result;
-        result += m_children[i]->descendantsDrawContent();
-        if (result > 1)
-            return result;
-    }
-    return result;
-}
-
 int Layer::id() const
 {
     return m_layerId;