vision: support ImageContext in detect requests

AUTHORS

@@ -9,3 +9,4 @@
 Google Inc.
 Anand Suresh
 Brett Bergmann
+Jesse Friedman

CONTRIBUTORS

@@ -17,6 +17,7 @@ Brett Bergmann <me@brettbergmann.com>
 Burcu Dogan <jbd@google.com>
 Hector Rovira <hrovira@gmail.com>
 Ido Shamun <idoesh1@gmail.com>
+Jesse Friedman <jesse@jesse.ws>
 Johan Euphrosine <proppy@google.com>
 Marco Ziccardi <marco.ziccard@gmail.com>
 Patrick Costello <pcostell@google.com>

lib/vision/index.js

@@ -194,6 +194,8 @@ Vision.prototype.annotate = function(requests, callback) {
  *     `logos`, `properties`, `safeSearch`, `text`.
  * @param {boolean=} options.verbose - Use verbose mode, which returns a less-
  *     simplistic representation of the annotation (default: `false`).
+ * @param {object=} options.imageContext - An `ImageContext`. See an
+ *     [`ImageContext`](https://cloud.google.com/vision/reference/rest/v1/images/annotate#ImageContext).
  * @param {function} callback - The callback function.
  * @param {?error} callback.err - An error returned while making this request.
  * @param {object|object[]} callback.detections - If a single detection type was
@@ -316,6 +318,10 @@ Vision.prototype.detect = function(images, options, callback) {
           cfg.features.maxResults = options.maxResults;
         }
 
+        if (is.object(options.imageContext)) {
+          cfg.imageContext = options.imageContext;
+        }
+
         config.push(cfg);
       });
     });