Add buggy GPU baselines for MultiPictureDraw Sierpinski GM (with bug label)

expectations/gm/Test-Win7-ShuttleA-HD2000-x86-Release-ANGLE/expected-results.json

 {
   "actual-results": {
     "failed": null, 
     "failure-ignored": null, 
     "no-comparison": null, 
     "succeeded": null
   }, 
   "expected-results": {
     "3x3bitmaprect_565.png": {
       "allowed-digests": [
@@ skipping 11090 matching lines @@
     }, 
     "multipicturedraw_rrectclip_tiled_angle.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           13123455672052131213
         ]
       ], 
       "reviewed-by-human": false
     }, 
+    "multipicturedraw_sierpinski_simple_angle.png": {
+      "allowed-digests": [
+        [
+          "bitmap-64bitMD5", 
+          11594688387107019920
+        ]
+      ], 
+      "bugs": [
+        2979
+      ], 
+      "reviewed-by-human": true
+    }, 
+    "multipicturedraw_sierpinski_tiled_angle.png": {
+      "allowed-digests": [
+        [
+          "bitmap-64bitMD5", 
+          17578222270818295881
+        ]
+      ], 
+      "bugs": [
+        2979
+      ], 
+      "reviewed-by-human": true
+    }, 
     "nested_aa_565.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           16123340172201812866
         ]
       ], 
       "bugs": [
         1578
       ], 
@@ skipping 4579 matching lines @@
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           10591909693224673086
         ]
       ], 
       "reviewed-by-human": false
     }
   }
 }