cc: Add tile-free software compositing mode.

cc/output/software_renderer.h

Index: cc/output/software_renderer.h
diff --git a/cc/output/software_renderer.h b/cc/output/software_renderer.h
index 90e6ed24845da08bb4eba05eb664f6bfb0d2144a..6fd523809b24c775f11be8d0c2165023aafda069 100644
--- a/cc/output/software_renderer.h
+++ b/cc/output/software_renderer.h
@@ -14,7 +14,9 @@ namespace cc {
 
 class OutputSurface;
 class SoftwareOutputDevice;
+class ContentDrawQuadBase;
 class DebugBorderDrawQuad;
+class PictureDrawQuad;
 class RendererClient;
 class RenderPassDrawQuad;
 class ResourceProvider;
@@ -71,8 +73,12 @@ class CC_EXPORT SoftwareRenderer : public DirectRenderer {
   void SetClipRect(gfx::Rect rect);
   bool IsSoftwareResource(ResourceProvider::ResourceId resource_id) const;
 
+  static SkMatrix ContentDrawQuadMatrix(const ContentDrawQuadBase* quad);
+
   void DrawDebugBorderQuad(const DrawingFrame* frame,
                            const DebugBorderDrawQuad* quad);
+  void DrawPictureQuad(const DrawingFrame* frame,
+                       const PictureDrawQuad* quad);
   void DrawSolidColorQuad(const DrawingFrame* frame,
                           const SolidColorDrawQuad* quad);
   void DrawTextureQuad(const DrawingFrame* frame,