Domain Reliability: Add more upload-related histograms.

components/domain_reliability/uploader.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 "components/domain_reliability/uploader.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/callback.h"
@@ skipping 78 matching lines @@
     fetcher->SetLoadFlags(net::LOAD_DO_NOT_SEND_COOKIES |
                           net::LOAD_DO_NOT_SAVE_COOKIES);
     fetcher->SetUploadData(kJsonMimeType, report_json);
     fetcher->SetAutomaticallyRetryOn5xx(false);
     fetcher->SetURLRequestUserData(
         UploadUserData::kUserDataKey,
         UploadUserData::CreateCreateDataCallback(max_upload_depth + 1));
     fetcher->Start();
 
     upload_callbacks_[fetcher] = {std::move(owned_fetcher), callback};
+
+    base::TimeTicks now = base::TimeTicks::Now();
+    if (!last_upload_start_time_.is_null()) {
+      UMA_HISTOGRAM_LONG_TIMES("DomainReliability.UploadIntervalGlobal",
+                               now - last_upload_start_time_);
+    }
+    last_upload_start_time_ = now;
   }
 
   void set_discard_uploads(bool discard_uploads) override {
     discard_uploads_ = discard_uploads;
     VLOG(1) << "Setting discard_uploads to " << discard_uploads;
   }
 
   // net::URLFetcherDelegate implementation:
   void OnURLFetchComplete(const net::URLFetcher* fetcher) override {
     DCHECK(fetcher);
@@ skipping 37 matching lines @@
 
  private:
   using DomainReliabilityUploader::UploadCallback;
 
   MockableTime* time_;
   scoped_refptr<net::URLRequestContextGetter> url_request_context_getter_;
   std::map<const net::URLFetcher*,
            std::pair<std::unique_ptr<net::URLFetcher>, UploadCallback>>
       upload_callbacks_;
   bool discard_uploads_;
+  base::TimeTicks last_upload_start_time_;
 };
 
 }  // namespace
 
 DomainReliabilityUploader::DomainReliabilityUploader() {}
 DomainReliabilityUploader::~DomainReliabilityUploader() {}
 
 // static
 std::unique_ptr<DomainReliabilityUploader> DomainReliabilityUploader::Create(
     MockableTime* time,
     const scoped_refptr<net::URLRequestContextGetter>&
         url_request_context_getter) {
   return std::unique_ptr<DomainReliabilityUploader>(
       new DomainReliabilityUploaderImpl(time, url_request_context_getter));
 }
 
 // static
 int DomainReliabilityUploader::GetURLRequestUploadDepth(
     const net::URLRequest& request) {
   UploadUserData* data = static_cast<UploadUserData*>(
       request.GetUserData(UploadUserData::kUserDataKey));
   if (!data)
     return 0;
   return data->depth();
 }
 
 }  // namespace domain_reliability