Rebaseline stragglers, mark shadertext2 as ignore on ubunutu for msaa configs.

expectations/gm/Test-Mac10.6-MacMini4.1-GeForce320M-x86-Debug/expected-results.json

 {
   "actual-results": {
     "failed": null, 
     "failure-ignored": null, 
     "no-comparison": null, 
     "succeeded": null
   }, 
   "expected-results": {
     "3x3bitmaprect_565.png": {
       "allowed-digests": [
@@ skipping 15193 matching lines @@
           "bitmap-64bitMD5", 
           13205076994244157607
         ]
       ], 
       "reviewed-by-human": true
     }, 
     "stroketext_gpu.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
-          13562391436655636242
+          2614658944612492840
         ]
       ], 
       "reviewed-by-human": true
     }, 
     "stroketext_pdf-mac.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           15577260848623483429
         ]
@@ skipping 1335 matching lines @@
           7829854837061118142
         ]
       ], 
       "bugs": [
         1578
       ], 
       "reviewed-by-human": false
     }
   }
 }