Adds UMA metrics for renderer uptime

chrome/browser/metrics/renderer_uptime_metrics_provider.cc

+// Copyright 2017 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 "chrome/browser/metrics/renderer_uptime_metrics_provider.h"
+
+#include <utility>
+
+#include "chrome/browser/metrics/renderer_uptime_tracker.h"
+#include "content/public/browser/notification_service.h"
+#include "content/public/browser/notification_types.h"
+#include "content/public/browser/render_process_host.h"
+#include "extensions/features/features.h"
+
+#if BUILDFLAG(ENABLE_EXTENSIONS)
+#include "extensions/browser/process_map.h"
+#endif
+
+RendererUptimeMetricsProvider::RendererUptimeMetricsProvider() {}
+
+void RendererUptimeMetricsProvider::OnRecordingEnabled() {
+  if (!RendererUptimeTracker::IsInitialized())
+    RendererUptimeTracker::Initialize();
+  registrar_.Add(this, content::NOTIFICATION_RENDERER_PROCESS_CREATED,
+                 content::NotificationService::AllSources());
+  registrar_.Add(this, content::NOTIFICATION_RENDERER_PROCESS_TERMINATED,
+                 content::NotificationService::AllSources());
+}
+
+void RendererUptimeMetricsProvider::OnRecordingDisabled() {
+  registrar_.RemoveAll();
+}
+
+void RendererUptimeMetricsProvider::Observe(
+    int type,
+    const content::NotificationSource& source,
+    const content::NotificationDetails& details) {
+  switch (type) {
+    case content::NOTIFICATION_RENDERER_PROCESS_CREATED: {
+      content::RenderProcessHost* host =
+          content::Source<content::RenderProcessHost>(source).ptr();
+#if BUILDFLAG(ENABLE_EXTENSIONS)
+      if (extensions::ProcessMap::Get(host->GetBrowserContext())
+              ->Contains(host->GetID())) {
+        break;
+      }
+#endif
+      RendererUptimeTracker::Get()->OnRendererStarted(host->GetID());
+      break;
+    }
+
+    case content::NOTIFICATION_RENDERER_PROCESS_TERMINATED: {
+      content::RenderProcessHost* host =
+          content::Source<content::RenderProcessHost>(source).ptr();
+#if BUILDFLAG(ENABLE_EXTENSIONS)
+      if (extensions::ProcessMap::Get(host->GetBrowserContext())
+              ->Contains(host->GetID())) {
+        break;
+      }
+#endif
+      RendererUptimeTracker::Get()->OnRendererTerminated(host->GetID());
+      break;
+    }
+
+    default:
+      NOTREACHED();
+      break;
+  }
+}