Add baselines for dftext GM.

TBR=robertphillips@google.com

Review URL: https://codereview.chromium.org/638683002
diff --git a/expectations/gm/Test-Win8-ShuttleA-HD7770-x86-Release/expected-results.json b/expectations/gm/Test-Win8-ShuttleA-HD7770-x86-Release/expected-results.json
index 9faaf14..8560171 100644
--- a/expectations/gm/Test-Win8-ShuttleA-HD7770-x86-Release/expected-results.json
+++ b/expectations/gm/Test-Win8-ShuttleA-HD7770-x86-Release/expected-results.json
@@ -4926,6 +4926,15 @@
       ], 
       "reviewed-by-human": false
     }, 
+    "dftext_gpu.png": {
+      "allowed-digests": [
+        [
+          "bitmap-64bitMD5", 
+          15452828897744721699
+        ]
+      ], 
+      "reviewed-by-human": true
+    }, 
     "discard_gpu.png": {
       "allowed-digests": [
         [