Add spellcheck and word suggestion to the prediction service

DEPS

Index: DEPS
diff --git a/DEPS b/DEPS
index 66fcaf80b44eef41f362828e83d87039db6f9865..c9a210b9c75ee00ab73941cd6d235eb305695dfa 100644
--- a/DEPS
+++ b/DEPS
@@ -395,4 +395,15 @@ hooks = [
                 '-d', 'src/services/keyboard_native/res',
     ],
   },
+  # Pull prediction resources using checked-in hashes.
+  {
+    'name': 'prediction_resources',
+    'pattern': '',
+    'action': [ 'download_from_google_storage',
+                '--no_resume',
+                '--no_auth',
+                '--bucket', 'mojo/prediction',
+                '-d', 'src/services/prediction/res',
+    ],
+  },
 ]