add SkSize for dimensions
add SkShape baseclass, in the hopes of having SkPicture inherit from that, and 
also using shapes as the extension mechanism for things like animated-gif



git-svn-id: http://skia.googlecode.com/svn/trunk@174 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/include/effects/SkNWayCanvas.h b/include/effects/SkNWayCanvas.h
index 2394037..03bd6d1 100644
--- a/include/effects/SkNWayCanvas.h
+++ b/include/effects/SkNWayCanvas.h
@@ -56,7 +56,8 @@
     virtual void drawTextOnPath(const void* text, size_t byteLength,
                                 const SkPath& path, const SkMatrix* matrix,
                                 const SkPaint& paint);
-    virtual void drawPicture(SkPicture& picture);
+    virtual void drawPicture(SkPicture&);
+    virtual void drawShape(SkShape*);
     virtual void drawVertices(VertexMode vmode, int vertexCount,
                               const SkPoint vertices[], const SkPoint texs[],
                               const SkColor colors[], SkXfermode* xmode,