Adding SkLumaXfermode GM results.

expectations/gm/Test-Mac10.6-MacMini4.1-GeForce320M-x86_64-Release/expected-results.json

 {
   "actual-results": {
     "failed": null, 
     "failure-ignored": null, 
     "no-comparison": null, 
     "succeeded": null
   }, 
   "expected-results": {
     "aaclip_gpu.png": {
       "allowed-digests": [
@@ skipping 4316 matching lines @@
     }, 
     "linepath_pdf-mac.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           4978814871689813952
         ]
       ], 
       "ignore-failure": false
     }, 
+    "lumamode_565.png": {
+      "allowed-digests": [
+        [
+          "bitmap-64bitMD5", 
+          9776410403870540718
+        ]
+      ]
+    }, 
+    "lumamode_8888.png": {
+      "allowed-digests": [
+        [
+          "bitmap-64bitMD5", 
+          709641026971881621
+        ]
+      ]
+    }, 
+    "lumamode_gpu.png": {
+      "allowed-digests": [
+        [
+          "bitmap-64bitMD5", 
+          17570468559236100609
+        ]
+      ]
+    }, 
+    "lumamode_pdf-mac.png": {
+      "allowed-digests": [
+        [
+          "bitmap-64bitMD5", 
+          1609005249391644342
+        ]
+      ],
+      "ignore-failure": true
+    }, 
     "matrixconvolution_565.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           2666679424629483487
         ]
       ], 
       "ignore-failure": false
     }, 
     "matrixconvolution_8888.png": {
@@ skipping 2286 matching lines @@
     "xfermodes_pdf-mac.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           9151974350149210736
         ]
       ], 
       "ignore-failure": false
     }
   }
-}
+}