Move second internal recursion to a precomputation in layer_tree_host_common.cc

cc/layer_impl.h

Index: cc/layer_impl.h
diff --git a/cc/layer_impl.h b/cc/layer_impl.h
index 89827af439dff290937819b3465097cb2491f3c0..93988400e2c737db1f309f3496deb9d7cef6a578 100644
--- a/cc/layer_impl.h
+++ b/cc/layer_impl.h
@@ -95,6 +95,7 @@ public:
 
     virtual ResourceProvider::ResourceId contentsResourceId() const;
 
+    virtual bool hasDelegatedContent() const;
     virtual bool hasContributingDelegatedRenderPasses() const;
     virtual RenderPass::Id firstContributingRenderPassId() const;
     virtual RenderPass::Id nextContributingRenderPassId(RenderPass::Id) const;
@@ -106,11 +107,6 @@ public:
     bool forceRenderSurface() const { return m_forceRenderSurface; }
     void setForceRenderSurface(bool force) { m_forceRenderSurface = force; }
 
-    // Returns 0 if none of the layer's descendants has content to draw,
-    // 1 if exactly one descendant has content to draw, or a number >1
-    // (but necessary the exact number of descendants) otherwise.
-    virtual int descendantsDrawContent();
-
     void setAnchorPoint(const gfx::PointF&);
     const gfx::PointF& anchorPoint() const { return m_anchorPoint; }