[CacheStorage] Add metrics to the scheduler

content/browser/cache_storage/cache_storage_operation.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 "content/browser/cache_storage/cache_storage_operation.h"
+
+#include "content/browser/cache_storage/cache_storage_histogram_macros.h"
+
+namespace content {
+
+namespace {
+const int kNumSecondsForSlowOperation = 10;
+}
+
+CacheStorageOperation::CacheStorageOperation(
+    const base::Closure& closure,
+    CacheStorageSchedulerClient client_type,
+    scoped_refptr<base::SingleThreadTaskRunner> task_runner)
+    : closure_(closure),
+      creation_ticks_(base::TimeTicks::Now()),
+      client_type_(client_type),
+      task_runner_(std::move(task_runner)),
+      weak_ptr_factory_(this) {}
+
+CacheStorageOperation::~CacheStorageOperation() {
+  CACHE_STORAGE_SCHEDULER_UMA(TIMES, "OperationDuration", client_type_,
+                              base::TimeTicks::Now() - start_ticks_);
+
+  if (!was_slow_)
+    CACHE_STORAGE_SCHEDULER_UMA(BOOLEAN, "IsOperationSlow", client_type_,
+                                false);
+}
+
+void CacheStorageOperation::Run() {
+  start_ticks_ = base::TimeTicks::Now();
+
+  task_runner_->PostDelayedTask(
+      FROM_HERE, base::Bind(&CacheStorageOperation::NotifyOperationSlow,
+                            weak_ptr_factory_.GetWeakPtr()),
+      base::TimeDelta::FromSeconds(kNumSecondsForSlowOperation));
+  closure_.Run();
+}
+
+void CacheStorageOperation::NotifyOperationSlow() {
+  was_slow_ = true;
+  CACHE_STORAGE_SCHEDULER_UMA(BOOLEAN, "IsOperationSlow", client_type_, true);
+}
+
+}  // namespace content