Add initial baselines for discard GM

expectations/gm/Test-Android-Logan-Nvidia-Arm7-Debug/expected-results.json

 {
   "expected-results": {
     "bezier_conic_effects_gpu.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           947503126928099687
         ]
       ], 
       "reviewed-by-human": true
@@ skipping 189 matching lines @@
     }, 
     "convex_poly_effect_nvprmsaa4.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           8563391143232887802
         ]
       ], 
       "reviewed-by-human": true
     }, 
+    "discard_gpu.png": {
+      "allowed-digests": [
+        [
+          "bitmap-64bitMD5", 
+          11635187478196931850
+        ]
+      ], 
+      "reviewed-by-human": true
+    }, 
+    "discard_msaa16.png": {
+      "allowed-digests": [
+        [
+          "bitmap-64bitMD5", 
+          11635187478196931850
+        ]
+      ], 
+      "reviewed-by-human": true
+    }, 
+    "discard_nvprmsaa4.png": {
+      "allowed-digests": [
+        [
+          "bitmap-64bitMD5", 
+          11635187478196931850
+        ]
+      ], 
+      "reviewed-by-human": true
+    }, 
     "drrect_565.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           3740162382031499255
         ]
       ], 
       "reviewed-by-human": true
     }, 
     "drrect_8888.png": {
@@ skipping 387 matching lines @@
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           11543118658936168636
         ]
       ], 
       "reviewed-by-human": true
     }
   }
 }