Create PluginMetricsProvider class.

chrome/browser/metrics/plugin_metrics_provider.h

Index: chrome/browser/metrics/plugin_metrics_provider.h
===================================================================
--- chrome/browser/metrics/plugin_metrics_provider.h	(revision 0)
+++ chrome/browser/metrics/plugin_metrics_provider.h	(working copy)
@@ -0,0 +1,91 @@
+// 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.
+
+#ifndef CHROME_BROWSER_METRICS_PLUGIN_METRICS_PROVIDER_H_
+#define CHROME_BROWSER_METRICS_PLUGIN_METRICS_PROVIDER_H_
+
+#include <map>
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/memory/weak_ptr.h"
+#include "base/strings/string16.h"
+#include "components/metrics/metrics_provider.h"
+#include "content/public/browser/browser_child_process_observer.h"
+
+namespace base {
+class FilePath;
+}
+
+namespace content {
+struct WebPluginInfo;
+}
+
+class PrefRegistrySimple;
+class PrefService;
+
+// PluginMetricsProvider is responsible for adding out plugin information to
+// the UMA proto.
+class PluginMetricsProvider : public metrics::MetricsProvider,
+                              public content::BrowserChildProcessObserver {
+ public:
+  explicit PluginMetricsProvider(PrefService* local_state);
+  virtual ~PluginMetricsProvider();
+
+  // Fetches plugin information data asynchronously and calls |done_callback|
+  // when done.
+  void GetPluginInformation(const base::Closure& done_callback);
+
+  // metrics::MetricsDataProvider:
+  virtual void ProvideSystemProfileMetrics(
+      metrics::SystemProfileProto* system_profile_proto) OVERRIDE;
+  virtual void ProvideStabilityMetrics(
+      metrics::SystemProfileProto* system_profile_proto) OVERRIDE;
+
+  // Saves plugin-related updates from the in-object buffer to Local State
+  // for retrieval next time we send a Profile log (generally next launch).
+  void RecordPluginChanges();
+
+  // Notifies the provider about an error loading the plugin at |plugin_path|.
+  void LogPluginLoadingError(const base::FilePath& plugin_path);
+
+  // Sets this provider's list of plugins, exposed for testing.
+  void SetPluginsForTesting(const std::vector<content::WebPluginInfo>& plugins);
+
+  // Registers local state prefs used by this class.
+  static void RegisterPrefs(PrefRegistrySimple* registry);
+
+ private:
+  struct ChildProcessStats;
+
+  // Receives the plugin list from the PluginService and calls |done_callback|.
+  void OnGotPlugins(const base::Closure& done_callback,
+                    const std::vector<content::WebPluginInfo>& plugins);
+
+  // Returns reference to ChildProcessStats corresponding to |data|.
+  ChildProcessStats& GetChildProcessStats(
+      const content::ChildProcessData& data);
+
+  // content::BrowserChildProcessObserver:
+  virtual void BrowserChildProcessHostConnected(
+      const content::ChildProcessData& data) OVERRIDE;
+  virtual void BrowserChildProcessCrashed(
+      const content::ChildProcessData& data) OVERRIDE;
+  virtual void BrowserChildProcessInstanceCreated(
+      const content::ChildProcessData& data) OVERRIDE;
+
+  PrefService* local_state_;
+
+  // The list of plugins which was retrieved on the file thread.
+  std::vector<content::WebPluginInfo> plugins_;
+
+  // Buffer of child process notifications for quick access.
+  std::map<base::string16, ChildProcessStats> child_process_stats_buffer_;
+
+  base::WeakPtrFactory<PluginMetricsProvider> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(PluginMetricsProvider);
+};
+
+#endif  // CHROME_BROWSER_METRICS_PLUGIN_METRICS_PROVIDER_H_