Use experimentation framework parameters for location sensitivity

chrome/browser/resources/google_now/background.js

Index: chrome/browser/resources/google_now/background.js
diff --git a/chrome/browser/resources/google_now/background.js b/chrome/browser/resources/google_now/background.js
index 188545b8174a75fc37d7b0e80dece2b35936eb11..499c8afb181d4c85bbd44184d0a45a66057c8240 100644
--- a/chrome/browser/resources/google_now/background.js
+++ b/chrome/browser/resources/google_now/background.js
@@ -121,6 +121,7 @@ var tasks = buildTaskManager(areTasksConflicting);
 
 // Add error processing to API calls.
 tasks.instrumentApiFunction(chrome.location.onLocationUpdate, 'addListener', 0);
+tasks.instrumentApiFunction(chrome.metricsPrivate, 'getVariationParams', 1);
 tasks.instrumentApiFunction(chrome.notifications, 'create', 2);
 tasks.instrumentApiFunction(chrome.notifications, 'update', 2);
 tasks.instrumentApiFunction(chrome.notifications, 'getAll', 0);
@@ -401,11 +402,19 @@ function requestNotificationCards(position, callback) {
 function requestLocation() {
   console.log('requestLocation');
   recordEvent(GoogleNowEvent.LOCATION_REQUEST);
-  // TODO(vadimt): Figure out location request options. Use experiments
-  // framework to enable setting these parameters remotely.
-  chrome.location.watchLocation(LOCATION_WATCH_NAME, {
-    minDistanceInMeters: 100,
-    minTimeInMilliseconds: 180000  // 3 minutes.
+  // TODO(vadimt): Figure out location request options.
+  chrome.metricsPrivate.getVariationParams('GoogleNow', function(params) {
+    var minDistanceInMeters =
+        parseInt(params && params.minDistanceInMeters) ||
+        100;
+    var minTimeInMilliseconds =
+        parseInt(params && params.minTimeInMilliseconds) ||
+        180000;  // 3 minutes.
+
+    chrome.location.watchLocation(LOCATION_WATCH_NAME, {
+      minDistanceInMeters: minDistanceInMeters,
+      minTimeInMilliseconds: minTimeInMilliseconds
+    });
   });
 }