PVer4: Add UMA metrics for time taken to: load DB, do prefix check,

components/safe_browsing_db/v4_database.cc

 // Copyright 2016 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 <memory>
 
 #include "base/callback.h"
 #include "base/debug/leak_annotations.h"
 #include "base/files/file_util.h"
 #include "base/memory/ptr_util.h"
+#include "base/metrics/histogram_macros.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "components/safe_browsing_db/v4_database.h"
 #include "content/public/browser/browser_thread.h"
 
 using content::BrowserThread;
+using base::TimeTicks;
 
 namespace safe_browsing {
 
 // static
 V4StoreFactory* V4Database::factory_ = NULL;
 
 // static
 void V4Database::Create(
     const scoped_refptr<base::SequencedTaskRunner>& db_task_runner,
     const base::FilePath& base_path,
     const ListInfos& list_infos,
     NewDatabaseReadyCallback new_db_callback) {
   DCHECK(base_path.IsAbsolute());
   DCHECK(!list_infos.empty());
 
   const scoped_refptr<base::SingleThreadTaskRunner> callback_task_runner =
       base::ThreadTaskRunnerHandle::Get();
   db_task_runner->PostTask(
-      FROM_HERE,
-      base::Bind(&V4Database::CreateOnTaskRunner, db_task_runner, base_path,
-                 list_infos, callback_task_runner, new_db_callback));
+      FROM_HERE, base::Bind(&V4Database::CreateOnTaskRunner, db_task_runner,
+                            base_path, list_infos, callback_task_runner,
+                            new_db_callback, TimeTicks::Now()));
 }
 
 // static
 void V4Database::CreateOnTaskRunner(
     const scoped_refptr<base::SequencedTaskRunner>& db_task_runner,
     const base::FilePath& base_path,
     const ListInfos& list_infos,
     const scoped_refptr<base::SingleThreadTaskRunner>& callback_task_runner,
-    NewDatabaseReadyCallback new_db_callback) {
+    NewDatabaseReadyCallback new_db_callback,
+    const TimeTicks create_start_time) {
   DCHECK(db_task_runner->RunsTasksOnCurrentThread());
 
   if (!factory_) {
     factory_ = new V4StoreFactory();
     ANNOTATE_LEAKING_OBJECT_PTR(factory_);
   }
 
   if (!base::CreateDirectory(base_path)) {
     NOTREACHED();
   }
 
   std::unique_ptr<StoreMap> store_map = base::MakeUnique<StoreMap>();
   for (const auto& it : list_infos) {
     if (!it.fetch_updates()) {
       // This list doesn't need to be fetched or stored on disk.
       continue;
     }
 
     const base::FilePath store_path = base_path.AppendASCII(it.filename());
     (*store_map)[it.list_id()].reset(
         factory_->CreateV4Store(db_task_runner, store_path));
   }
   std::unique_ptr<V4Database> v4_database(
       new V4Database(db_task_runner, std::move(store_map)));
 
   // Database is done loading, pass it to the new_db_callback on the caller's
   // thread. This would unblock resource loads.
   callback_task_runner->PostTask(
       FROM_HERE, base::Bind(new_db_callback, base::Passed(&v4_database)));
+
+  UMA_HISTOGRAM_TIMES("SafeBrowsing.V4DatabaseOpen.Time",
+                      TimeTicks::Now() - create_start_time);
 }
 
 V4Database::V4Database(
     const scoped_refptr<base::SequencedTaskRunner>& db_task_runner,
     std::unique_ptr<StoreMap> store_map)
     : db_task_runner_(db_task_runner),
       store_map_(std::move(store_map)),
       pending_store_updates_(0) {
   DCHECK(db_task_runner->RunsTasksOnCurrentThread());
 }
@@ skipping 137 matching lines @@
       filename_(filename),
       list_id_(list_id),
       sb_threat_type_(sb_threat_type) {
   DCHECK(!fetch_updates_ || !filename_.empty());
   DCHECK_NE(SB_THREAT_TYPE_SAFE, sb_threat_type_);
 }
 
 ListInfo::~ListInfo() {}
 
 }  // namespace safe_browsing