Rebaseline shadertext2 after SkPaint::measureText changes

expectations/gm/Test-ChromeOS-Link-HD4000-x86_64-Release/expected-results.json

 {
   "expected-results": {
     "3x3bitmaprect_565.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           12831071530564277917
         ]
       ], 
       "bugs": [
@@ skipping 5608 matching lines @@
       ], 
       "bugs": [
         1578
       ], 
       "reviewed-by-human": false
     }, 
     "shadertext2_8888.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
-          8189097946205624269
+          974977660301425412
         ]
       ], 
       "reviewed-by-human": true
     }, 
     "shadertext3_565.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           13641016986377676105
         ]
@@ skipping 978 matching lines @@
           2149562185397201955
         ]
       ], 
       "bugs": [
         1578
       ], 
       "reviewed-by-human": false
     }
   }
 }