Add expectations for dashing gm

expectations/gm/Test-ChromeOS-Alex-GMA3150-x86-Release/expected-results.json

 {
   "expected-results": {
     "3x3bitmaprect_565.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           12831071530564277917
         ]
       ], 
       "bugs": [
@@ skipping 2340 matching lines @@
     }, 
     "dashing3_8888.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           2000525185460569669
         ]
       ], 
       "reviewed-by-human": true
     }, 
+    "dashing4_565.png": {
+      "allowed-digests": [
+        [
+          "bitmap-64bitMD5", 
+          3905274096451946067
+        ]
+      ], 
+      "reviewed-by-human": true
+    }, 
+    "dashing4_8888.png": {
+      "allowed-digests": [
+        [
+          "bitmap-64bitMD5", 
+          1394068287232006716
+        ]
+      ], 
+      "reviewed-by-human": true
+    }, 
     "dashing_565.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           2587070015488181148
         ]
       ], 
       "bugs": [
         1578
       ], 
@@ skipping 4085 matching lines @@
           2149562185397201955
         ]
       ], 
       "bugs": [
         1578
       ], 
       "reviewed-by-human": false
     }
   }
 }