Move second internal recursion to a precomputation in layer_tree_host_common.cc

cc/layer_impl.h

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_LAYER_IMPL_H_
 #define CC_LAYER_IMPL_H_
 
 #include <public/WebFilterOperations.h>
 #include <string>
 
@@ skipping 77 matching lines @@
     // willDraw must be called before appendQuads. If willDraw is called,
     // didDraw is guaranteed to be called before another willDraw or before
     // the layer is destroyed. To enforce this, any class that overrides
     // willDraw/didDraw must call the base class version.
     virtual void willDraw(ResourceProvider*);
     virtual void appendQuads(QuadSink&, AppendQuadsData&) { }
     virtual void didDraw(ResourceProvider*);
 
     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;
 
     // Returns true if this layer has content to draw.
     void setDrawsContent(bool);
     bool drawsContent() const { return m_drawsContent; }
 
     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; }
 
     void setAnchorPointZ(float);
     float anchorPointZ() const { return m_anchorPointZ; }
 
     void setBackgroundColor(SkColor);
     SkColor backgroundColor() const { return m_backgroundColor; }
 
     void setFilters(const WebKit::WebFilterOperations&);
@@ skipping 281 matching lines @@
     // Group of properties that need to be computed based on the layer tree
     // hierarchy before layers can be drawn.
     DrawProperties<LayerImpl, RenderSurfaceImpl> m_drawProperties;
 
     DISALLOW_COPY_AND_ASSIGN(LayerImpl);
 };
 
 }
 
 #endif  // CC_LAYER_IMPL_H_