add SkPath as real lua object

tools/lua/scrape.lua

 -- just a helper function to dump the parameters, for debugging
 function tostr(t)
     local str = ""
     for k, v in next, t do
         if #str > 0 then
             str = str .. ", "
         end
         if type(k) == "number" then
             str = str .. "[" .. k .. "] = "
         else
@@ skipping 39 matching lines @@
 ]]
 function sk_scrape_accumulate(t)
     local n = total[t.verb] or 0
     total[t.verb] = n + 1
 
     if false and t.verb == "drawRect" then
         local m = canvas:getTotalMatrix()
         print("... ", tostr(m), "\n")
     end
 
+    if false and t.verb == "drawPath" then
+        local pred, r1, r2, d1, d2 = t.path:isNestedRects()
+        
+        if pred then
+            print("drawRect_Nested", tostr(r1), tostr(r2), d1, d2)
+        else
+            print("drawPath", "isEmpty", tostring(t.path:isEmpty()),
+                    "isRect", tostring(t.path:isRect()), tostr(t.path:getBounds()))
+        end
+    end
+
     -- enable to dump all of the parameters we were sent
     if false then
         -- dump the params in t, specifically showing the verb first, which we
         -- then nil out so it doesn't appear in tostr()
         io.write(t.verb, " ")
         t.verb = nil
         io.write(tostr(t), "\n")
     end
 end
 
 --[[
     lua_pictures will call this function after all of the pictures have been
     "accumulated".
 ]]
 function sk_scrape_summarize()
     io.write("\n{ ", tostr(total), " }\n")
 end