Adding SkLumaXfermode GM results.

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

 {
   "actual-results": {
     "failed": null, 
     "failure-ignored": null, 
     "no-comparison": null, 
     "succeeded": null
   }, 
   "expected-results": {
     "aaclip_gpu.png": {
       "allowed-digests": [
@@ skipping 2724 matching lines @@
     }, 
     "linepath_gpu.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           301604990440380181
         ]
       ], 
       "ignore-failure": false
     }, 
+    "lumamode_565.png": {
+      "allowed-digests": [
+        [
+          "bitmap-64bitMD5", 
+          7384879675028140231
+        ]
+      ]
+    }, 
+    "lumamode_8888.png": {
+      "allowed-digests": [
+        [
+          "bitmap-64bitMD5", 
+          12788881843097605555
+        ]
+      ]
+    }, 
+    "lumamode_gpu.png": {
+      "allowed-digests": [
+        [
+          "bitmap-64bitMD5", 
+          8651505370041252446
+        ]
+      ]
+    }, 
+    "lumamode_pdf-poppler.png": {
+      "allowed-digests": [
+        [
+          "bitmap-64bitMD5", 
+          4995743986536267719
+        ]
+      ],
+      "ignore-failure": true
+    }, 
     "matrixconvolution_565.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           13720891290777302947
         ]
       ], 
       "ignore-failure": false
     }, 
     "matrixconvolution_8888.png": {
@@ skipping 1360 matching lines @@
     "xfermodes_gpu.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           13632669295194296329
         ]
       ], 
       "ignore-failure": false
     }
   }
-}
+}