[Most Visited] Log suggestion provider to UMA

chrome/browser/search/most_visited_iframe_source.cc

Index: chrome/browser/search/most_visited_iframe_source.cc
diff --git a/chrome/browser/search/most_visited_iframe_source.cc b/chrome/browser/search/most_visited_iframe_source.cc
index 7afd64cd5ee485a148d10cd9665bf890328dc934..0a04d60d76934e105eaf93845a0edb9562ac289b 100644
--- a/chrome/browser/search/most_visited_iframe_source.cc
+++ b/chrome/browser/search/most_visited_iframe_source.cc
@@ -35,6 +35,8 @@ MostVisitedIframeSource::~MostVisitedIframeSource() {
 const int MostVisitedIframeSource::kNumMostVisited = 8;
 const char MostVisitedIframeSource::kMostVisitedHistogramName[] =
     "NewTabPage.MostVisited";
+const char MostVisitedIframeSource::kMostVisitedHistogramWithProvider[] =
+    "NewTabPage.MostVisited.%s";
 
 std::string MostVisitedIframeSource::GetSource() const {
   return chrome::kChromeSearchMostVisitedHost;
@@ -69,8 +71,14 @@ void MostVisitedIframeSource::StartDataRequest(
     int position;
     if (net::GetValueForKeyInQuery(url, "pos", &str_position) &&
         base::StringToInt(str_position, &position)) {
-      UMA_HISTOGRAM_ENUMERATION(kMostVisitedHistogramName, position,
-                                kNumMostVisited);
+      // Log the Most Visited click.
+      MV_CLICK_HISTOGRAM(position, NULL);
+      // If a specific provider is specified, log the metric specific to the
+      // provider.
+      std::string provider;
+      if (net::GetValueForKeyInQuery(url, "pr", &provider)) {
+        MV_CLICK_HISTOGRAM(position, provider.c_str());
+      }
       // Records the action. This will be available as a time-stamped stream
       // server-side and can be used to compute time-to-long-dwell.
       content::RecordAction(content::UserMetricsAction("MostVisited_Clicked"));