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

expectations/gm/Test-Win8-ShuttleA-GTX660-x86-Release/expected-results.json

Index: expectations/gm/Test-Win8-ShuttleA-GTX660-x86-Release/expected-results.json
diff --git a/expectations/gm/Test-Win8-ShuttleA-GTX660-x86-Release/expected-results.json b/expectations/gm/Test-Win8-ShuttleA-GTX660-x86-Release/expected-results.json
index 510341720256f15651bfbd0add66074c94e1e5ad..30c55aa58d4e94f5bc6724f7990139340ebbc737 100644
--- a/expectations/gm/Test-Win8-ShuttleA-GTX660-x86-Release/expected-results.json
+++ b/expectations/gm/Test-Win8-ShuttleA-GTX660-x86-Release/expected-results.json
@@ -14498,6 +14498,42 @@
       ], 
       "reviewed-by-human": true
     }, 
+    "multipicturedraw_sierpinski_simple_gpu.png": {
+      "allowed-digests": [
+        [
+          "bitmap-64bitMD5", 
+          16885876554717619098
+        ]
+      ], 
+      "bugs": [
+        2979
+      ], 
+      "reviewed-by-human": true
+    }, 
+    "multipicturedraw_sierpinski_simple_msaa16.png": {
+      "allowed-digests": [
+        [
+          "bitmap-64bitMD5", 
+          2044682847021656048
+        ]
+      ], 
+      "bugs": [
+        2979
+      ], 
+      "reviewed-by-human": true
+    }, 
+    "multipicturedraw_sierpinski_simple_nvprmsaa4.png": {
+      "allowed-digests": [
+        [
+          "bitmap-64bitMD5", 
+          1639491234074650719
+        ]
+      ], 
+      "bugs": [
+        2979
+      ], 
+      "reviewed-by-human": true
+    }, 
     "multipicturedraw_sierpinski_tiled_565.png": {
       "allowed-digests": [
         [
@@ -14516,6 +14552,42 @@
       ], 
       "reviewed-by-human": true
     }, 
+    "multipicturedraw_sierpinski_tiled_gpu.png": {
+      "allowed-digests": [
+        [
+          "bitmap-64bitMD5", 
+          16431098041911666171
+        ]
+      ], 
+      "bugs": [
+        2979
+      ], 
+      "reviewed-by-human": true
+    }, 
+    "multipicturedraw_sierpinski_tiled_msaa16.png": {
+      "allowed-digests": [
+        [
+          "bitmap-64bitMD5", 
+          1128754009388027603
+        ]
+      ], 
+      "bugs": [
+        2979
+      ], 
+      "reviewed-by-human": true
+    }, 
+    "multipicturedraw_sierpinski_tiled_nvprmsaa4.png": {
+      "allowed-digests": [
+        [
+          "bitmap-64bitMD5", 
+          7250319640790922489
+        ]
+      ], 
+      "bugs": [
+        2979
+      ], 
+      "reviewed-by-human": true
+    }, 
     "nested_aa_565.png": {
       "allowed-digests": [
         [