cc: Only make num_threads - 1 SkPicture clones.

cc/output/direct_renderer.h

 // Copyright 2012 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_OUTPUT_DIRECT_RENDERER_H_
 #define CC_OUTPUT_DIRECT_RENDERER_H_
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/containers/scoped_ptr_hash_map.h"
 #include "cc/base/cc_export.h"
 #include "cc/output/renderer.h"
 #include "cc/resources/resource_provider.h"
 #include "cc/resources/scoped_resource.h"
+#include "cc/resources/task_graph_runner.h"
 
 namespace cc {
 
 class ResourceProvider;
 
 // This is the base class for code shared between the GL and software
 // renderer implementations.  "Direct" refers to the fact that it does not
 // delegate rendering to another compositor.
 class CC_EXPORT DirectRenderer : public Renderer {
  public:
@@ skipping 64 matching lines @@
   void SetScissorTestRectInDrawSpace(const DrawingFrame* frame,
                                      const gfx::RectF& draw_space_rect);
 
   static gfx::Size RenderPassTextureSize(const RenderPass* render_pass);
 
   void DrawRenderPass(DrawingFrame* frame,
                       const RenderPass* render_pass,
                       bool allow_partial_swap);
   bool UseRenderPass(DrawingFrame* frame, const RenderPass* render_pass);
 
+  void RunOnDemandRasterTask(internal::Task* on_demand_raster_task);
+
   virtual void BindFramebufferToOutputSurface(DrawingFrame* frame) = 0;
   virtual bool BindFramebufferToTexture(DrawingFrame* frame,
                                         const ScopedResource* resource,
                                         const gfx::Rect& target_rect) = 0;
   virtual void SetDrawViewport(const gfx::Rect& window_space_viewport) = 0;
   virtual void SetScissorTestRect(const gfx::Rect& scissor_rect) = 0;
   virtual void DiscardPixels(bool has_external_stencil_test,
                              bool draw_rect_covers_full_surface) = 0;
   virtual void ClearFramebuffer(DrawingFrame* frame,
                                 bool has_external_stencil_test) = 0;
@@ skipping 20 matching lines @@
   // framebuffer. During a draw, this stores the values for the current render
   // pass; in between draws, they retain the values for the root render pass of
   // the last draw.
   gfx::Rect current_draw_rect_;
   gfx::Rect current_viewport_rect_;
   gfx::Size current_surface_size_;
 
  private:
   gfx::Vector2d enlarge_pass_texture_amount_;
 
+  internal::NamespaceToken on_demand_task_namespace_;
+
   DISALLOW_COPY_AND_ASSIGN(DirectRenderer);
 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_DIRECT_RENDERER_H_