Adding SkLumaXfermode GM results.

expectations/gm/Test-Ubuntu12-ShuttleA-NoGPU-x86_64-Debug/expected-results.json

 {
   "actual-results": {
     "failed": null, 
     "failure-ignored": null, 
     "no-comparison": null, 
     "succeeded": null
   }, 
   "expected-results": {
     "aaclip_565.png": {
       "allowed-digests": [
@@ skipping 2694 matching lines @@
     }, 
     "linepath_gpu.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           14043651536943681688
         ]
       ], 
       "ignore-failure": false
     }, 
+    "lumamode_565.png": {
+      "allowed-digests": [
+        [
+          "bitmap-64bitMD5", 
+          16991972047111813318
+        ]
+      ]
+    }, 
+    "lumamode_8888.png": {
+      "allowed-digests": [
+        [
+          "bitmap-64bitMD5", 
+          14320238949339336861
+        ]
+      ]
+    }, 
+    "lumamode_pdf-poppler.png": {
+      "allowed-digests": [
+        [
+          "bitmap-64bitMD5", 
+          16316576401360384636
+        ]
+      ],
+      "ignore-failure": true
+    }, 
     "matrixconvolution_565.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           12455136854619171244
         ]
       ], 
       "ignore-failure": false
     }, 
     "matrixconvolution_8888.png": {
@@ skipping 1361 matching lines @@
     "xfermodes_gpu.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           14130006638306207334
         ]
       ], 
       "ignore-failure": false
     }
   }
-}
+}