Adds the NewTabPage.SuggestedSitesAction stat.

chrome/browser/ui/webui/ntp/suggestions_page_handler.cc

Index: chrome/browser/ui/webui/ntp/suggestions_page_handler.cc
===================================================================
--- chrome/browser/ui/webui/ntp/suggestions_page_handler.cc	(revision 130353)
+++ chrome/browser/ui/webui/ntp/suggestions_page_handler.cc	(working copy)
@@ -11,6 +11,7 @@
 #include "base/md5.h"
 #include "base/memory/scoped_vector.h"
 #include "base/memory/singleton.h"
+#include "base/metrics/histogram.h"
 #include "base/string16.h"
 #include "base/string_number_conversions.h"
 #include "base/threading/thread.h"
@@ -27,18 +28,42 @@
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/url_constants.h"
 #include "content/public/browser/browser_thread.h"
+#include "content/public/browser/navigation_controller.h"
+#include "content/public/browser/navigation_entry.h"
 #include "content/public/browser/notification_source.h"
 #include "content/public/browser/user_metrics.h"
+#include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_ui.h"
+#include "content/public/common/page_transition_types.h"
 #include "googleurl/src/gurl.h"
 
 using content::UserMetricsAction;
 
 SuggestionsHandler::SuggestionsHandler()
-    : got_first_suggestions_request_(false) {
+    : got_first_suggestions_request_(false),
+      suggestions_viewed_(false),
+      valid_user_action_(false) {
 }
 
 SuggestionsHandler::~SuggestionsHandler() {
+  // TODO(macourteau): ensure that |suggestions_viewed_| gets set correctly,
+  // once the Suggestions pane gets be statically included into the NTP (e.g.,
+  // if the Suggestions pane is the one shown by default, the
+  // |suggestions_viewed_| flag might not get set).
+  if (!valid_user_action_ && suggestions_viewed_) {
+    const GURL ntp_url = GURL(chrome::kChromeUINewTabURL);
+    int action_id = 0;  // "0" means "Other".
+    content::NavigationEntry* entry =
+        web_ui()->GetWebContents()->GetController().GetActiveEntry();
+    if (entry && (entry->GetURL() != ntp_url)) {
+      if (content::PageTransitionStripQualifier(entry->GetTransitionType()) ==
+          content::PAGE_TRANSITION_TYPED) {
+        action_id = 3;  // "3" means "Navigation via omnibox".
+      }
+    }
+
+    UMA_HISTOGRAM_ENUMERATION("NewTabPage.SuggestedSitesAction", action_id, 4);
+  }
 }
 
 void SuggestionsHandler::RegisterMessages() {
@@ -81,6 +106,12 @@
   web_ui()->RegisterMessageCallback("clearSuggestionsURLsBlacklist",
       base::Bind(&SuggestionsHandler::HandleClearBlacklist,
                  base::Unretained(this)));
+  web_ui()->RegisterMessageCallback("suggestedSitesAction",
+      base::Bind(&SuggestionsHandler::HandleSuggestedSitesAction,
+                 base::Unretained(this)));
+  web_ui()->RegisterMessageCallback("suggestedSitesSelected",
+      base::Bind(&SuggestionsHandler::HandleSuggestedSitesSelected,
+                 base::Unretained(this)));
 }
 
 void SuggestionsHandler::HandleGetSuggestions(const ListValue* args) {
@@ -135,6 +166,25 @@
   // TODO(georgey) clear blacklist.
 }
 
+void SuggestionsHandler::HandleSuggestedSitesAction(
+    const base::ListValue* args) {
+  DCHECK(args);
+
+  double action_id;
+  if (!args->GetDouble(0, &action_id))
+    NOTREACHED();
+
+  UMA_HISTOGRAM_ENUMERATION("NewTabPage.SuggestedSitesAction",
+                            static_cast<int>(action_id), 4);
+  suggestions_viewed_ = true;
+  valid_user_action_ = true;
+}
+
+void SuggestionsHandler::HandleSuggestedSitesSelected(
+    const base::ListValue* args) {
+  suggestions_viewed_ = true;
+}
+
 void SuggestionsHandler::SetPagesValueFromTopSites(
     const history::MostVisitedURLList& data) {
   pages_value_.reset(new ListValue());