Pre-cache fDirection and fConvexity for recorded SkPaths too.

Pre-cache fDirection and fConvexity for recorded SkPaths too.

http://build.chromium.org/p/client.skia/builders/Test-Ubuntu13.10-GCE-NoGPU-x86_64-Release-TSAN/builds/1211/steps/dm/logs/stdio

I don't see any big perf hit locally:

desk_googlespreadsheetdashed.skp	1.68ms -> 1.74ms	1.04x
             desk_mobilenews.skp	 643us ->  665us	1.04x
               desk_tigersvg.skp	51.1us -> 52.5us	1.03x
     desk_jsfiddlehumperclip.skp	  37us -> 37.9us	1.02x
               desk_samoasvg.skp	 373us ->  380us	1.02x
              desk_wordpress.skp	 697us ->  708us	1.02x
                 desk_mapsvg.skp	 698us ->  708us	1.02x
             tabl_googleblog.skp	 553us ->  560us	1.01x
                desk_wowwiki.skp	1.31ms -> 1.32ms	1.01x
                tabl_mozilla.skp	1.44ms -> 1.45ms	1.01x
                 desk_sfgate.skp	 156us ->  157us	1.01x
             desk_chalkboard.skp	 376us ->  378us	1x
                  desk_baidu.skp	 101us ->  101us	1x
            desk_gmailthread.skp	 231us ->  231us	1x
                 desk_carsvg.skp	 379us ->  379us	1x
             desk_googlehome.skp	38.1us -> 38.1us	1x
          desk_css3gradients.skp	89.6us -> 89.2us	1x
      desk_googlespreadsheet.skp	 549us ->  546us	0.99x
            desk_pokemonwiki.skp	8.67ms -> 8.62ms	0.99x
                    tabl_mlb.skp	 294us ->  291us	0.99x
            tabl_gamedeksiam.skp	 700us ->  692us	0.99x
           tabl_worldjournal.skp	 143us ->  142us	0.99x
                desk_blogger.skp	 441us ->  436us	0.99x
                desk_twitter.skp	 452us ->  446us	0.99x
                    desk_gws.skp	 152us ->  150us	0.99x
                  tabl_gmail.skp	24.2us -> 23.9us	0.99x
                tabl_sahadan.skp	84.7us -> 83.5us	0.99x
                    tabl_cnn.skp	1.24ms -> 1.22ms	0.99x
                  tabl_ukwsj.skp	 543us ->  535us	0.99x
           desk_yahooanswers.skp	 124us ->  123us	0.99x
                desk_booking.skp	 905us ->  891us	0.98x
          tabl_androidpolice.skp	1.76ms -> 1.73ms	0.98x
          desk_ugamsolutions.skp	 281us ->  276us	0.98x
                desk_nytimes.skp	 209us ->  204us	0.98x
               tabl_techmeme.skp	98.4us -> 96.1us	0.98x
                 tabl_nofolo.skp	59.2us -> 57.8us	0.98x
                desk_weather.skp	 244us ->  238us	0.98x
               desk_facebook.skp	 546us ->  531us	0.97x
               desk_linkedin.skp	 321us ->  311us	0.97x
                   tabl_digg.skp	 801us ->  770us	0.96x
      tabl_culturalsolutions.skp	 332us ->  319us	0.96x
                 desk_amazon.skp	 103us ->   99us	0.96x
               tabl_engadget.skp	 610us ->  579us	0.95x
                   tabl_cnet.skp	 144us ->  136us	0.95x
               desk_fontwipe.skp	36.6us -> 34.7us	0.95x
                   desk_ebay.skp	 173us ->  164us	0.94x
                   tabl_hsfi.skp	5.95us -> 5.58us	0.94x
             tabl_deviantart.skp	 134us ->  126us	0.94x
                   desk_espn.skp	 261us ->  243us	0.93x

BUG=skia:

Review URL: https://codereview.chromium.org/861853002