Add first party sites (PLUS, INBOX, DOCS) in ServiceWorkerSite UMA.

content/browser/service_worker/service_worker_metrics.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/service_worker/service_worker_metrics.h"
 
 #include <limits>
 #include <string>
 
 #include "base/metrics/histogram_macros.h"
@@ skipping 192 matching lines @@
   // URL, but not available in content layer.
   static const char google_like_scope_prefix[] = "https://www.google.";
   static const char ntp_scope_path[] = "/_/chrome/";
   if (base::StartsWith(url.spec(), google_like_scope_prefix,
                        base::CompareCase::INSENSITIVE_ASCII) &&
       base::StartsWith(url.path(), ntp_scope_path,
                        base::CompareCase::SENSITIVE)) {
     return ServiceWorkerMetrics::Site::NEW_TAB_PAGE;
   }
 
+  const std::string host = url.host();
+  if (host == "plus.google.com")
+    return ServiceWorkerMetrics::Site::PLUS;
+  if (host == "inbox.google.com")
+    return ServiceWorkerMetrics::Site::INBOX;
+  if (host == "docs.google.com" || host == "drive.google.com")

[Mark P, 2016/08/22 17:00:53]

nit: parens around binary operators (==)

+    return ServiceWorkerMetrics::Site::DOCS;
   return ServiceWorkerMetrics::Site::OTHER;
 }
 
 bool ServiceWorkerMetrics::IsNavigationHintEvent(EventType event_type) {
   return event_type == EventType::NAVIGATION_HINT_LINK_MOUSE_DOWN ||
          event_type == EventType::NAVIGATION_HINT_LINK_TAP_UNCONFIRMED ||
          event_type == EventType::NAVIGATION_HINT_LINK_TAP_DOWN;
 }
 
 bool ServiceWorkerMetrics::ShouldExcludeSiteFromHistogram(Site site) {
@@ skipping 457 matching lines @@
   } else if (failure_count == 2) {
     UMA_HISTOGRAM_ENUMERATION("ServiceWorker.StartWorker.AfterFailureStreak_2",
                               status, SERVICE_WORKER_ERROR_MAX_VALUE);
   } else if (failure_count == 3) {
     UMA_HISTOGRAM_ENUMERATION("ServiceWorker.StartWorker.AfterFailureStreak_3",
                               status, SERVICE_WORKER_ERROR_MAX_VALUE);
   }
 }
 
 }  // namespace content