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

expectations/gm/Test-Mac10.8-MacMini4.1-GeForce320M-x86_64-Release/expected-results.json

 {
   "actual-results": {
     "failed": null, 
     "failure-ignored": null, 
     "no-comparison": null, 
     "succeeded": null
   }, 
   "expected-results": {
     "3x3bitmaprect_565.png": {
       "allowed-digests": [
@@ skipping 12776 matching lines @@
     }, 
     "multipicturedraw_sierpinski_simple_8888.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           15848231028177105193
         ]
       ], 
       "reviewed-by-human": true
     }, 
+    "multipicturedraw_sierpinski_simple_gpu.png": {
+      "allowed-digests": [
+        [
+          "bitmap-64bitMD5", 
+          237609131529135346
+        ]
+      ], 
+      "bugs": [
+        2979
+      ], 
+      "reviewed-by-human": true
+    }, 
     "multipicturedraw_sierpinski_simple_pdf-mac.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           15848231028177105193
         ]
       ], 
       "reviewed-by-human": true
     }, 
     "multipicturedraw_sierpinski_simple_pdf-native.png": {
@@ skipping 16 matching lines @@
     }, 
     "multipicturedraw_sierpinski_tiled_8888.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           1046298969627112289
         ]
       ], 
       "reviewed-by-human": true
     }, 
+    "multipicturedraw_sierpinski_tiled_gpu.png": {
+      "allowed-digests": [
+        [
+          "bitmap-64bitMD5", 
+          6204971877139189869
+        ]
+      ], 
+      "bugs": [
+        2979
+      ], 
+      "reviewed-by-human": true
+    }, 
     "multipicturedraw_sierpinski_tiled_pdf-mac.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           8577706448194294498
         ]
       ], 
       "reviewed-by-human": true
     }, 
     "multipicturedraw_sierpinski_tiled_pdf-native.png": {
@@ skipping 5464 matching lines @@
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           10030599291822810250
         ]
       ], 
       "reviewed-by-human": false
     }
   }
 }