Add SBClientDownload.DownloadRequestNetworkDuration and DownloadRequestTimeoutDuration histograms.

chrome/browser/safe_browsing/download_protection_service.cc

Index: chrome/browser/safe_browsing/download_protection_service.cc
diff --git a/chrome/browser/safe_browsing/download_protection_service.cc b/chrome/browser/safe_browsing/download_protection_service.cc
index 76fff6936ee3851b1426d1cfcd3d4964ca0d45a9..298bdb569697c7f181cfd18f8cea1639bf1cfa06 100644
--- a/chrome/browser/safe_browsing/download_protection_service.cc
+++ b/chrome/browser/safe_browsing/download_protection_service.cc
@@ -355,6 +355,7 @@ class DownloadProtectionService::CheckClientDownloadRequest
       // Request has already been cancelled.
       return;
     }
+    timeout_start_time_ = base::TimeTicks::Now();
     BrowserThread::PostDelayedTask(
         BrowserThread::UI,
         FROM_HERE,
@@ -733,6 +734,7 @@ class DownloadProtectionService::CheckClientDownloadRequest
     fetcher_->SetRequestContext(service_->request_context_getter_.get());
     fetcher_->SetUploadData("application/octet-stream",
                             client_download_request_data_);
+    request_start_time_ = base::TimeTicks::Now();
     UMA_HISTOGRAM_COUNTS("SBClientDownload.DownloadRequestPayloadSize",
                          client_download_request_data_.size());
     fetcher_->Start();
@@ -757,6 +759,14 @@ class DownloadProtectionService::CheckClientDownloadRequest
     // Ensure the timeout task is cancelled while we still have a non-zero
     // refcount. (crbug.com/240449)
     weakptr_factory_.InvalidateWeakPtrs();
+    if (!timeout_start_time_.is_null()) {
+      UMA_HISTOGRAM_TIMES("SBClientDownload.DownloadRequestTimeoutDuration",
+                          base::TimeTicks::Now() - timeout_start_time_);
+    }
+    if (!request_start_time_.is_null()) {
+      UMA_HISTOGRAM_TIMES("SBClientDownload.DownloadRequestNetworkDuration",
+                          base::TimeTicks::Now() - request_start_time_);
+    }
     if (service_) {
       VLOG(2) << "SafeBrowsing download verdict for: "
               << item_->DebugString(true) << " verdict:" << reason;
@@ -847,6 +857,8 @@ class DownloadProtectionService::CheckClientDownloadRequest
   CancelableRequestConsumer request_consumer_;  // For HistoryService lookup.
   base::WeakPtrFactory<CheckClientDownloadRequest> weakptr_factory_;
   base::TimeTicks start_time_;  // Used for stats.
+  base::TimeTicks timeout_start_time_;
+  base::TimeTicks request_start_time_;
 
   DISALLOW_COPY_AND_ASSIGN(CheckClientDownloadRequest);
 };