[Most Visited] Log suggestion provider to UMA

chrome/browser/resources/local_ntp/most_visited_util.js

Index: chrome/browser/resources/local_ntp/most_visited_util.js
diff --git a/chrome/browser/resources/local_ntp/most_visited_util.js b/chrome/browser/resources/local_ntp/most_visited_util.js
index bd389ae09a9d1efd6521e674bd65aa78c5931bfb..993b67efeed9d95c9769850098d0ed596407a3f4 100644
--- a/chrome/browser/resources/local_ntp/most_visited_util.js
+++ b/chrome/browser/resources/local_ntp/most_visited_util.js
@@ -36,6 +36,12 @@ var NTP_LOGGING_EVENT_TYPE = {
   NTP_EXTERNAL_TILE: 7
 };
 
+/** @type {string} Indicating the suggestion came from the server. */
+var SERVER_PROVIDER = 'server';
+
+/** @type {string} Indicating the suggestions came from the client. */
+var CLIENT_PROVIDER = 'client';
+
 /**
  * Parses query parameters from Location.
  * @param {string} location The URL to generate the CSS url for.
@@ -70,9 +76,12 @@ function parseQueryParams(location) {
  * @param {string|undefined} ping If specified, a location relative to the
  *     referrer of this iframe, to ping when the link is clicked. Only works if
  *     the referrer is HTTPS.
+ * @param {string|undefined} provider A provider name (max 8 alphanumeric
+ *     characters) used for logging. Undefined if suggestion is not coming from
+ *     the server.
  * @return {HTMLAnchorElement} A new link element.
  */
-function createMostVisitedLink(params, href, title, text, ping) {
+function createMostVisitedLink(params, href, title, text, ping, provider) {
   var styles = getMostVisitedStyles(params, !!text);
   var link = document.createElement('a');
   link.style.color = styles.color;
@@ -82,6 +91,8 @@ function createMostVisitedLink(params, href, title, text, ping) {
   link.href = href;
   if ('pos' in params && isFinite(params.pos)) {
     link.ping = '/log.html?pos=' + params.pos;
+    if (provider)
+      link.ping += '&pr=' + provider;
     // If a ping parameter was specified, add it to the list of pings, relative
     // to the referrer of this iframe, which is the default search provider.
     if (ping) {
@@ -162,6 +173,7 @@ function fillMostVisited(location, fill) {
     data.direction = params.di || '';
     data.domain = params.dom || '';
     data.ping = params.ping || '';
+    data.provider = params.pr || SERVER_PROVIDER;
     // Log the fact that suggestion was obtained from the server.
     var ntpApiHandle = chrome.embeddedSearch.newTabPage;
     ntpApiHandle.logEvent(NTP_LOGGING_EVENT_TYPE.NTP_SERVER_SIDE_SUGGESTION);
@@ -170,11 +182,13 @@ function fillMostVisited(location, fill) {
     data = apiHandle.getMostVisitedItemData(params.rid);
     if (!data)
       return;
+    data.provider = CLIENT_PROVIDER;
     delete data.ping;
   }
   if (/^javascript:/i.test(data.url) ||
       /^javascript:/i.test(data.thumbnailUrl) ||
-      /^javascript:/i.test(data.thumbnailUrl2))
+      /^javascript:/i.test(data.thumbnailUrl2) ||
+      !/^[a-z0-9]{0,8}$/i.test(data.provider))
     return;
   if (data.direction)
     document.body.dir = data.direction;