Create PluginMetricsProvider class.

Also changes ProvideStabilityMetrics() to take a SystemProfileProto* instead
of the stability section, since the plugin provider needs to inspect things
in the system profile when writing its stability data.

Also, cleans up some header includes.

BUG=374220
R=isherman@chromium.org, thestig@chromium.org
TBR=thestig@chromium.org

Review URL: https://codereview.chromium.org/299783004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@272462 0039d316-1c4b-4281-b951-d872f2087c98

18 files changed, 615 insertions, 474 deletions

diff --git a/chrome/browser/browser_process_impl.cc b/chrome/browser/browser_process_impl.cc
index 91687ef..a4e35338 100644
--- a/chrome/browser/browser_process_impl.cc
+++ b/chrome/browser/browser_process_impl.cc
@@ -76,6 +76,7 @@
 #include "chrome/common/switch_utils.h"
 #include "chrome/common/url_constants.h"
 #include "chrome/installer/util/google_update_constants.h"
+#include "chrome/installer/util/google_update_settings.h"
 #include "components/policy/core/common/policy_service.h"
 #include "components/signin/core/common/profile_management_switches.h"
 #include "components/translate/core/browser/translate_download_manager.h"
diff --git a/chrome/browser/metrics/android_metrics_provider.cc b/chrome/browser/metrics/android_metrics_provider.cc
index f696b07..ddb4158 100644
--- a/chrome/browser/metrics/android_metrics_provider.cc
+++ b/chrome/browser/metrics/android_metrics_provider.cc
@@ -39,7 +39,7 @@ AndroidMetricsProvider::~AndroidMetricsProvider() {
 
 
 void AndroidMetricsProvider::ProvideStabilityMetrics(
-    metrics::SystemProfileProto_Stability* stability_proto) {
+    metrics::SystemProfileProto* system_profile_proto) {
   ConvertStabilityPrefsToHistograms();
 }
 
diff --git a/chrome/browser/metrics/android_metrics_provider.h b/chrome/browser/metrics/android_metrics_provider.h
index 8a00adc..8b004da 100644
--- a/chrome/browser/metrics/android_metrics_provider.h
+++ b/chrome/browser/metrics/android_metrics_provider.h
@@ -25,7 +25,7 @@ class AndroidMetricsProvider : public metrics::MetricsProvider {
 
   // metrics::MetricsDataProvider:
   virtual void ProvideStabilityMetrics(
-      metrics::SystemProfileProto_Stability* stability_proto) OVERRIDE;
+      metrics::SystemProfileProto* system_profile_proto) OVERRIDE;
 
   // Registers local state prefs used by this class.
   static void RegisterPrefs(PrefRegistrySimple* registry);
diff --git a/chrome/browser/metrics/chrome_stability_metrics_provider.cc b/chrome/browser/metrics/chrome_stability_metrics_provider.cc
index 0af26ef..f846671 100644
--- a/chrome/browser/metrics/chrome_stability_metrics_provider.cc
+++ b/chrome/browser/metrics/chrome_stability_metrics_provider.cc
@@ -79,8 +79,10 @@ void ChromeStabilityMetricsProvider::OnRecordingDisabled() {
 }
 
 void ChromeStabilityMetricsProvider::ProvideStabilityMetrics(
-    metrics::SystemProfileProto_Stability* stability_proto) {
+    metrics::SystemProfileProto* system_profile_proto) {
   PrefService* pref = g_browser_process->local_state();
+  metrics::SystemProfileProto_Stability* stability_proto =
+      system_profile_proto->mutable_stability();
 
   int count = pref->GetInteger(prefs::kStabilityPageLoadCount);
   if (count) {
diff --git a/chrome/browser/metrics/chrome_stability_metrics_provider.h b/chrome/browser/metrics/chrome_stability_metrics_provider.h
index 246f7d7..9a814e0 100644
--- a/chrome/browser/metrics/chrome_stability_metrics_provider.h
+++ b/chrome/browser/metrics/chrome_stability_metrics_provider.h
@@ -29,7 +29,7 @@ class ChromeStabilityMetricsProvider : public metrics::MetricsProvider,
   virtual void OnRecordingEnabled() OVERRIDE;
   virtual void OnRecordingDisabled() OVERRIDE;
   virtual void ProvideStabilityMetrics(
-      metrics::SystemProfileProto_Stability* stability_proto) OVERRIDE;
+      metrics::SystemProfileProto* system_profile_proto) OVERRIDE;
 
  private:
   // content::NotificationObserver:
diff --git a/chrome/browser/metrics/metrics_log.cc b/chrome/browser/metrics/metrics_log.cc
index f4ae797..b421c74 100644
--- a/chrome/browser/metrics/metrics_log.cc
+++ b/chrome/browser/metrics/metrics_log.cc
@@ -26,8 +26,6 @@
 #include "base/tracked_objects.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/metrics/extension_metrics.h"
-#include "chrome/browser/plugins/plugin_prefs.h"
-#include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/common/pref_names.h"
 #include "components/metrics/metrics_provider.h"
 #include "components/metrics/metrics_service_client.h"
@@ -37,7 +35,6 @@
 #include "components/variations/active_field_trials.h"
 #include "content/public/browser/gpu_data_manager.h"
 #include "content/public/common/content_client.h"
-#include "content/public/common/webplugininfo.h"
 #include "gpu/config/gpu_info.h"
 #include "ui/gfx/screen.h"
 #include "url/gurl.h"
@@ -116,38 +113,6 @@ std::string ComputeSHA1(const std::string& data) {
   return base::HexEncode(sha1.data(), sha1.size());
 }
 
-#if defined(ENABLE_PLUGINS)
-// Returns the plugin preferences corresponding for this user, if available.
-// If multiple user profiles are loaded, returns the preferences corresponding
-// to an arbitrary one of the profiles.
-PluginPrefs* GetPluginPrefs() {
-  ProfileManager* profile_manager = g_browser_process->profile_manager();
-
-  if (!profile_manager) {
-    // The profile manager can be NULL when testing.
-    return NULL;
-  }
-
-  std::vector<Profile*> profiles = profile_manager->GetLoadedProfiles();
-  if (profiles.empty())
-    return NULL;
-
-  return PluginPrefs::GetForProfile(profiles.front()).get();
-}
-
-// Fills |plugin| with the info contained in |plugin_info| and |plugin_prefs|.
-void SetPluginInfo(const content::WebPluginInfo& plugin_info,
-                   const PluginPrefs* plugin_prefs,
-                   SystemProfileProto::Plugin* plugin) {
-  plugin->set_name(base::UTF16ToUTF8(plugin_info.name));
-  plugin->set_filename(plugin_info.path.BaseName().AsUTF8Unsafe());
-  plugin->set_version(base::UTF16ToUTF8(plugin_info.version));
-  plugin->set_is_pepper(plugin_info.is_pepper_plugin());
-  if (plugin_prefs)
-    plugin->set_is_disabled(!plugin_prefs->IsPluginEnabled(plugin_info));
-}
-#endif  // defined(ENABLE_PLUGINS)
-
 void WriteFieldTrials(const std::vector<ActiveGroupId>& field_trial_ids,
                       SystemProfileProto* system_profile) {
   for (std::vector<ActiveGroupId>::const_iterator it =
@@ -280,11 +245,6 @@ MetricsLog::MetricsLog(const std::string& client_id,
 
 MetricsLog::~MetricsLog() {}
 
-// static
-void MetricsLog::RegisterPrefs(PrefRegistrySimple* registry) {
-  registry->RegisterListPref(prefs::kStabilityPluginStats);
-}
-
 void MetricsLog::RecordStabilityMetrics(
     const std::vector<metrics::MetricsProvider*>& metrics_providers,
     base::TimeDelta incremental_uptime,
@@ -301,7 +261,6 @@ void MetricsLog::RecordStabilityMetrics(
   //       sent, but that's true for all the metrics.
 
   WriteRequiredStabilityAttributes(pref);
-  WritePluginStabilityElements(pref);
 
   // Record recent delta for critical stability metrics.  We can't wait for a
   // restart to gather these, as that delay biases our observation away from
@@ -309,10 +268,9 @@ void MetricsLog::RecordStabilityMetrics(
   // uma log upload, just as we send histogram data.
   WriteRealtimeStabilityAttributes(pref, incremental_uptime, uptime);
 
-  SystemProfileProto::Stability* stability =
-      uma_proto()->mutable_system_profile()->mutable_stability();
+  SystemProfileProto* system_profile = uma_proto()->mutable_system_profile();
   for (size_t i = 0; i < metrics_providers.size(); ++i)
-    metrics_providers[i]->ProvideStabilityMetrics(stability);
+    metrics_providers[i]->ProvideStabilityMetrics(system_profile);
 
   // Omit some stats unless this is the initial stability log.
   if (log_type() != INITIAL_STABILITY_LOG)
@@ -336,6 +294,8 @@ void MetricsLog::RecordStabilityMetrics(
 
   // TODO(jar): The following are all optional, so we *could* optimize them for
   // values of zero (and not include them).
+  SystemProfileProto::Stability* stability =
+      system_profile->mutable_stability();
   stability->set_incomplete_shutdown_count(incomplete_shutdown_count);
   stability->set_breakpad_registration_success_count(
       breakpad_registration_success_count);
@@ -382,76 +342,6 @@ bool MetricsLog::HasStabilityMetrics() const {
   return uma_proto()->system_profile().stability().has_launch_count();
 }
 
-void MetricsLog::WritePluginStabilityElements(PrefService* pref) {
-  // Now log plugin stability info.
-  const base::ListValue* plugin_stats_list = pref->GetList(
-      prefs::kStabilityPluginStats);
-  if (!plugin_stats_list)
-    return;
-
-#if defined(ENABLE_PLUGINS)
-  SystemProfileProto::Stability* stability =
-      uma_proto()->mutable_system_profile()->mutable_stability();
-  for (base::ListValue::const_iterator iter = plugin_stats_list->begin();
-       iter != plugin_stats_list->end(); ++iter) {
-    if (!(*iter)->IsType(base::Value::TYPE_DICTIONARY)) {
-      NOTREACHED();
-      continue;
-    }
-    base::DictionaryValue* plugin_dict =
-        static_cast<base::DictionaryValue*>(*iter);
-
-    // Note that this search is potentially a quadratic operation, but given the
-    // low number of plugins installed on a "reasonable" setup, this should be
-    // fine.
-    // TODO(isherman): Verify that this does not show up as a hotspot in
-    // profiler runs.
-    const SystemProfileProto::Plugin* system_profile_plugin = NULL;
-    std::string plugin_name;
-    plugin_dict->GetString(prefs::kStabilityPluginName, &plugin_name);
-    const SystemProfileProto& system_profile = uma_proto()->system_profile();
-    for (int i = 0; i < system_profile.plugin_size(); ++i) {
-      if (system_profile.plugin(i).name() == plugin_name) {
-        system_profile_plugin = &system_profile.plugin(i);
-        break;
-      }
-    }
-
-    if (!system_profile_plugin) {
-      NOTREACHED();
-      continue;
-    }
-
-    SystemProfileProto::Stability::PluginStability* plugin_stability =
-        stability->add_plugin_stability();
-    *plugin_stability->mutable_plugin() = *system_profile_plugin;
-
-    int launches = 0;
-    plugin_dict->GetInteger(prefs::kStabilityPluginLaunches, &launches);
-    if (launches > 0)
-      plugin_stability->set_launch_count(launches);
-
-    int instances = 0;
-    plugin_dict->GetInteger(prefs::kStabilityPluginInstances, &instances);
-    if (instances > 0)
-      plugin_stability->set_instance_count(instances);
-
-    int crashes = 0;
-    plugin_dict->GetInteger(prefs::kStabilityPluginCrashes, &crashes);
-    if (crashes > 0)
-      plugin_stability->set_crash_count(crashes);
-
-    int loading_errors = 0;
-    plugin_dict->GetInteger(prefs::kStabilityPluginLoadingErrors,
-                            &loading_errors);
-    if (loading_errors > 0)
-      plugin_stability->set_loading_error_count(loading_errors);
-  }
-#endif  // defined(ENABLE_PLUGINS)
-
-  pref->ClearPref(prefs::kStabilityPluginStats);
-}
-
 // The server refuses data that doesn't have certain values.  crashcount and
 // launchcount are currently "required" in the "stability" group.
 // TODO(isherman): Stop writing these attributes specially once the migration to
@@ -497,25 +387,8 @@ void MetricsLog::WriteRealtimeStabilityAttributes(
     stability->set_uptime_sec(uptime_sec);
 }
 
-void MetricsLog::WritePluginList(
-    const std::vector<content::WebPluginInfo>& plugin_list) {
-  DCHECK(!locked());
-
-#if defined(ENABLE_PLUGINS)
-  PluginPrefs* plugin_prefs = GetPluginPrefs();
-  SystemProfileProto* system_profile = uma_proto()->mutable_system_profile();
-  for (std::vector<content::WebPluginInfo>::const_iterator iter =
-           plugin_list.begin();
-       iter != plugin_list.end(); ++iter) {
-    SystemProfileProto::Plugin* plugin = system_profile->add_plugin();
-    SetPluginInfo(*iter, plugin_prefs, plugin);
-  }
-#endif  // defined(ENABLE_PLUGINS)
-}
-
 void MetricsLog::RecordEnvironment(
     const std::vector<metrics::MetricsProvider*>& metrics_providers,
-    const std::vector<content::WebPluginInfo>& plugin_list,
     const std::vector<variations::ActiveGroupId>& synthetic_trials) {
   DCHECK(!HasEnvironment());
 
@@ -595,7 +468,6 @@ void MetricsLog::RecordEnvironment(
   WriteScreenDPIInformationProto(hardware);
 #endif
 
-  WritePluginList(plugin_list);
   extension_metrics_.WriteExtensionList(uma_proto()->mutable_system_profile());
 
   std::vector<ActiveGroupId> field_trial_ids;
diff --git a/chrome/browser/metrics/metrics_log.h b/chrome/browser/metrics/metrics_log.h
index 177bf31..27f54a4 100644
--- a/chrome/browser/metrics/metrics_log.h
+++ b/chrome/browser/metrics/metrics_log.h
@@ -14,13 +14,11 @@
 #include "base/basictypes.h"
 #include "chrome/browser/metrics/extension_metrics.h"
 #include "chrome/common/variations/variations_util.h"
-#include "chrome/installer/util/google_update_settings.h"
 #include "components/metrics/metrics_log_base.h"
 #include "ui/gfx/size.h"
 
 class HashedExtensionMetrics;
 class PrefService;
-class PrefRegistrySimple;
 
 #if defined(OS_CHROMEOS)
 class MetricsLogChromeOS;
@@ -62,8 +60,6 @@ class MetricsLog : public metrics::MetricsLogBase {
              metrics::MetricsServiceClient* client);
   virtual ~MetricsLog();
 
-  static void RegisterPrefs(PrefRegistrySimple* registry);
-
   // Records the current operating environment, including metrics provided by
   // the specified set of |metrics_providers|.  Takes the list of installed
   // plugins, Google Update statistics, and synthetic trial IDs as parameters
@@ -73,7 +69,6 @@ class MetricsLog : public metrics::MetricsLogBase {
   // is determined by the pref value.
   void RecordEnvironment(
       const std::vector<metrics::MetricsProvider*>& metrics_providers,
-      const std::vector<content::WebPluginInfo>& plugin_list,
       const std::vector<variations::ActiveGroupId>& synthetic_trials);
 
   // Loads the environment proto that was saved by the last RecordEnvironment()
@@ -145,9 +140,6 @@ class MetricsLog : public metrics::MetricsLogBase {
   // call to RecordStabilityMetrics().
   bool HasStabilityMetrics() const;
 
-  // Within stability group, write plugin crash stats.
-  void WritePluginStabilityElements(PrefService* pref);
-
   // Within the stability group, write required attributes.
   void WriteRequiredStabilityAttributes(PrefService* pref);
 
@@ -159,9 +151,6 @@ class MetricsLog : public metrics::MetricsLogBase {
                                         base::TimeDelta incremental_uptime,
                                         base::TimeDelta uptime);
 
-  // Writes the list of installed plugins.
-  void WritePluginList(const std::vector<content::WebPluginInfo>& plugin_list);
-
   // Used to interact with the embedder. Weak pointer; must outlive |this|
   // instance.
   metrics::MetricsServiceClient* const client_;
diff --git a/chrome/browser/metrics/metrics_log_unittest.cc b/chrome/browser/metrics/metrics_log_unittest.cc
index a2ae6f4..2a52719 100644
--- a/chrome/browser/metrics/metrics_log_unittest.cc
+++ b/chrome/browser/metrics/metrics_log_unittest.cc
@@ -11,12 +11,10 @@
 #include "base/command_line.h"
 #include "base/port.h"
 #include "base/prefs/pref_service.h"
-#include "base/prefs/scoped_user_pref_update.h"
 #include "base/prefs/testing_pref_service.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
-#include "base/strings/utf_string_conversions.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "base/time/time.h"
 #include "base/tracked_objects.h"
@@ -24,17 +22,14 @@
 #include "chrome/browser/prefs/browser_prefs.h"
 #include "chrome/common/chrome_version_info.h"
 #include "chrome/common/pref_names.h"
-#include "chrome/installer/util/google_update_settings.h"
 #include "components/metrics/metrics_hashes.h"
 #include "components/metrics/metrics_provider.h"
 #include "components/metrics/proto/profiler_event.pb.h"
 #include "components/metrics/proto/system_profile.pb.h"
 #include "components/metrics/test_metrics_service_client.h"
 #include "components/variations/active_field_trials.h"
-#include "components/variations/metrics_util.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/common/process_type.h"
-#include "content/public/common/webplugininfo.h"
 #include "content/public/test/test_browser_thread_bundle.h"
 #include "content/public/test/test_utils.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ -99,24 +94,6 @@ const variations::ActiveGroupId kSyntheticTrials[] = {
   {66, 16}
 };
 
-#if defined(ENABLE_PLUGINS)
-content::WebPluginInfo CreateFakePluginInfo(
-    const std::string& name,
-    const base::FilePath::CharType* path,
-    const std::string& version,
-    bool is_pepper) {
-  content::WebPluginInfo plugin(base::UTF8ToUTF16(name),
-                                base::FilePath(path),
-                                base::UTF8ToUTF16(version),
-                                base::string16());
-  if (is_pepper)
-    plugin.type = content::WebPluginInfo::PLUGIN_TYPE_PEPPER_IN_PROCESS;
-  else
-    plugin.type = content::WebPluginInfo::PLUGIN_TYPE_NPAPI;
-  return plugin;
-}
-#endif  // defined(ENABLE_PLUGINS)
-
 #if defined(OS_CHROMEOS)
 class TestMetricsLogChromeOS : public MetricsLogChromeOS {
  public:
@@ -317,14 +294,13 @@ TEST_F(MetricsLogTest, RecordEnvironment) {
   metrics::TestMetricsServiceClient client;
   TestMetricsLog log(kClientId, kSessionId, MetricsLog::ONGOING_LOG, &client);
 
-  std::vector<content::WebPluginInfo> plugins;
   std::vector<variations::ActiveGroupId> synthetic_trials;
   // Add two synthetic trials.
   synthetic_trials.push_back(kSyntheticTrials[0]);
   synthetic_trials.push_back(kSyntheticTrials[1]);
 
   log.RecordEnvironment(std::vector<metrics::MetricsProvider*>(),
-                        plugins, synthetic_trials);
+                        synthetic_trials);
   // Check that the system profile on the log has the correct values set.
   CheckSystemProfile(log.system_profile());
 
@@ -361,7 +337,6 @@ TEST_F(MetricsLogTest, LoadSavedEnvironmentFromPrefs) {
     TestMetricsLog log(
         kClientId, kSessionId, MetricsLog::ONGOING_LOG, &client, &prefs);
     log.RecordEnvironment(std::vector<metrics::MetricsProvider*>(),
-                          std::vector<content::WebPluginInfo>(),
                           std::vector<variations::ActiveGroupId>());
     EXPECT_FALSE(prefs.GetString(kSystemProfilePref).empty());
     EXPECT_FALSE(prefs.GetString(kSystemProfileHashPref).empty());
@@ -385,7 +360,6 @@ TEST_F(MetricsLogTest, LoadSavedEnvironmentFromPrefs) {
         kClientId, kSessionId, MetricsLog::ONGOING_LOG, &client, &prefs);
     // Call RecordEnvironment() to record the pref again.
     log.RecordEnvironment(std::vector<metrics::MetricsProvider*>(),
-                          std::vector<content::WebPluginInfo>(),
                           std::vector<variations::ActiveGroupId>());
   }
 
@@ -407,7 +381,6 @@ TEST_F(MetricsLogTest, InitialLogStabilityMetrics) {
       kClientId, kSessionId, MetricsLog::INITIAL_STABILITY_LOG, &client);
   std::vector<metrics::MetricsProvider*> metrics_providers;
   log.RecordEnvironment(metrics_providers,
-                        std::vector<content::WebPluginInfo>(),
                         std::vector<variations::ActiveGroupId>());
   log.RecordStabilityMetrics(metrics_providers, base::TimeDelta(),
                              base::TimeDelta());
@@ -429,7 +402,6 @@ TEST_F(MetricsLogTest, OngoingLogStabilityMetrics) {
   TestMetricsLog log(kClientId, kSessionId, MetricsLog::ONGOING_LOG, &client);
   std::vector<metrics::MetricsProvider*> metrics_providers;
   log.RecordEnvironment(metrics_providers,
-                        std::vector<content::WebPluginInfo>(),
                         std::vector<variations::ActiveGroupId>());
   log.RecordStabilityMetrics(metrics_providers, base::TimeDelta(),
                              base::TimeDelta());
@@ -446,59 +418,6 @@ TEST_F(MetricsLogTest, OngoingLogStabilityMetrics) {
   EXPECT_FALSE(stability.has_debugger_not_present_count());
 }
 
-#if defined(ENABLE_PLUGINS)
-TEST_F(MetricsLogTest, Plugins) {
-  metrics::TestMetricsServiceClient client;
-  TestMetricsLog log(kClientId, kSessionId, MetricsLog::ONGOING_LOG, &client);
-
-  std::vector<metrics::MetricsProvider*> metrics_providers;
-  std::vector<content::WebPluginInfo> plugins;
-  plugins.push_back(CreateFakePluginInfo("p1", FILE_PATH_LITERAL("p1.plugin"),
-                                         "1.5", true));
-  plugins.push_back(CreateFakePluginInfo("p2", FILE_PATH_LITERAL("p2.plugin"),
-                                         "2.0", false));
-  log.RecordEnvironment(metrics_providers, plugins,
-                        std::vector<variations::ActiveGroupId>());
-
-  const metrics::SystemProfileProto& system_profile = log.system_profile();
-  ASSERT_EQ(2, system_profile.plugin_size());
-  EXPECT_EQ("p1", system_profile.plugin(0).name());
-  EXPECT_EQ("p1.plugin", system_profile.plugin(0).filename());
-  EXPECT_EQ("1.5", system_profile.plugin(0).version());
-  EXPECT_TRUE(system_profile.plugin(0).is_pepper());
-  EXPECT_EQ("p2", system_profile.plugin(1).name());
-  EXPECT_EQ("p2.plugin", system_profile.plugin(1).filename());
-  EXPECT_EQ("2.0", system_profile.plugin(1).version());
-  EXPECT_FALSE(system_profile.plugin(1).is_pepper());
-
-  // Now set some plugin stability stats for p2 and verify they're recorded.
-  scoped_ptr<base::DictionaryValue> plugin_dict(new base::DictionaryValue);
-  plugin_dict->SetString(prefs::kStabilityPluginName, "p2");
-  plugin_dict->SetInteger(prefs::kStabilityPluginLaunches, 1);
-  plugin_dict->SetInteger(prefs::kStabilityPluginCrashes, 2);
-  plugin_dict->SetInteger(prefs::kStabilityPluginInstances, 3);
-  plugin_dict->SetInteger(prefs::kStabilityPluginLoadingErrors, 4);
-  {
-    ListPrefUpdate update(log.GetPrefService(), prefs::kStabilityPluginStats);
-    update.Get()->Append(plugin_dict.release());
-  }
-
-  log.RecordStabilityMetrics(metrics_providers, base::TimeDelta(),
-                             base::TimeDelta());
-  const metrics::SystemProfileProto_Stability& stability =
-      log.system_profile().stability();
-  ASSERT_EQ(1, stability.plugin_stability_size());
-  EXPECT_EQ("p2", stability.plugin_stability(0).plugin().name());
-  EXPECT_EQ("p2.plugin", stability.plugin_stability(0).plugin().filename());
-  EXPECT_EQ("2.0", stability.plugin_stability(0).plugin().version());
-  EXPECT_FALSE(stability.plugin_stability(0).plugin().is_pepper());
-  EXPECT_EQ(1, stability.plugin_stability(0).launch_count());
-  EXPECT_EQ(2, stability.plugin_stability(0).crash_count());
-  EXPECT_EQ(3, stability.plugin_stability(0).instance_count());
-  EXPECT_EQ(4, stability.plugin_stability(0).loading_error_count());
-}
-#endif  // defined(ENABLE_PLUGINS)
-
 // Test that we properly write profiler data to the log.
 TEST_F(MetricsLogTest, RecordProfilerData) {
   // WARNING: If you broke the below check, you've modified how
@@ -694,9 +613,8 @@ TEST_F(MetricsLogTest, MultiProfileUserCount) {
   metrics::TestMetricsServiceClient client;
   TestMetricsLog log(kClientId, kSessionId, MetricsLog::ONGOING_LOG, &client);
   std::vector<metrics::MetricsProvider*> metrics_providers;
-  std::vector<content::WebPluginInfo> plugins;
   std::vector<variations::ActiveGroupId> synthetic_trials;
-  log.RecordEnvironment(metrics_providers, plugins, synthetic_trials);
+  log.RecordEnvironment(metrics_providers, synthetic_trials);
   EXPECT_EQ(2u, log.system_profile().multi_profile_user_count());
 }
 
@@ -721,9 +639,7 @@ TEST_F(MetricsLogTest, MultiProfileCountInvalidated) {
   user_manager->LoginUser(user2);
   std::vector<metrics::MetricsProvider*> metrics_providers;
   std::vector<variations::ActiveGroupId> synthetic_trials;
-  log.RecordEnvironment(metrics_providers,
-                        std::vector<content::WebPluginInfo>(),
-                        synthetic_trials);
+  log.RecordEnvironment(metrics_providers, synthetic_trials);
   EXPECT_EQ(0u, log.system_profile().multi_profile_user_count());
 }
 
@@ -731,7 +647,6 @@ TEST_F(MetricsLogTest, BluetoothHardwareDisabled) {
   metrics::TestMetricsServiceClient client;
   TestMetricsLog log(kClientId, kSessionId, MetricsLog::ONGOING_LOG, &client);
   log.RecordEnvironment(std::vector<metrics::MetricsProvider*>(),
-                        std::vector<content::WebPluginInfo>(),
                         std::vector<variations::ActiveGroupId>());
 
   EXPECT_TRUE(log.system_profile().has_hardware());
@@ -750,7 +665,6 @@ TEST_F(MetricsLogTest, BluetoothHardwareEnabled) {
   metrics::TestMetricsServiceClient client;
   TestMetricsLog log(kClientId, kSessionId, MetricsLog::ONGOING_LOG, &client);
   log.RecordEnvironment(std::vector<metrics::MetricsProvider*>(),
-                        std::vector<content::WebPluginInfo>(),
                         std::vector<variations::ActiveGroupId>());
 
   EXPECT_TRUE(log.system_profile().has_hardware());
@@ -781,7 +695,6 @@ TEST_F(MetricsLogTest, BluetoothPairedDevices) {
   metrics::TestMetricsServiceClient client;
   TestMetricsLog log(kClientId, kSessionId, MetricsLog::ONGOING_LOG, &client);
   log.RecordEnvironment(std::vector<metrics::MetricsProvider*>(),
-                        std::vector<content::WebPluginInfo>(),
                         std::vector<variations::ActiveGroupId>());
 
   ASSERT_TRUE(log.system_profile().has_hardware());
diff --git a/chrome/browser/metrics/metrics_service.cc b/chrome/browser/metrics/metrics_service.cc
index 063f12f..9392702 100644
--- a/chrome/browser/metrics/metrics_service.cc
+++ b/chrome/browser/metrics/metrics_service.cc
@@ -174,7 +174,6 @@
 #include "base/metrics/statistics_recorder.h"
 #include "base/prefs/pref_registry_simple.h"
 #include "base/prefs/pref_service.h"
-#include "base/prefs/scoped_user_pref_update.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/threading/platform_thread.h"
@@ -201,16 +200,17 @@
 #include "components/metrics/metrics_reporting_scheduler.h"
 #include "components/metrics/metrics_service_client.h"
 #include "components/variations/entropy_provider.h"
-#include "components/variations/metrics_util.h"
 #include "content/public/browser/child_process_data.h"
-#include "content/public/browser/plugin_service.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/user_metrics.h"
-#include "content/public/common/process_type.h"
-#include "content/public/common/webplugininfo.h"
 #include "net/base/load_flags.h"
 #include "net/url_request/url_fetcher.h"
 
+#if defined(ENABLE_PLUGINS)
+// TODO(asvitkine): Move this out of MetricsService.
+#include "chrome/browser/metrics/plugin_metrics_provider.h"
+#endif
+
 #if defined(OS_CHROMEOS)
 #include "chrome/browser/chromeos/settings/cros_settings.h"
 #include "chromeos/system/statistics_provider.h"
@@ -229,8 +229,6 @@
 
 using base::Time;
 using content::BrowserThread;
-using content::ChildProcessData;
-using content::PluginService;
 using metrics::MetricsLogManager;
 
 namespace {
@@ -321,46 +319,6 @@ MetricsService::ShutdownCleanliness MetricsService::clean_shutdown_status_ =
 MetricsService::ExecutionPhase MetricsService::execution_phase_ =
     MetricsService::UNINITIALIZED_PHASE;
 
-// This is used to quickly log stats from child process related notifications in
-// MetricsService::child_stats_buffer_.  The buffer's contents are transferred
-// out when Local State is periodically saved.  The information is then
-// reported to the UMA server on next launch.
-struct MetricsService::ChildProcessStats {
- public:
-  explicit ChildProcessStats(int process_type)
-      : process_launches(0),
-        process_crashes(0),
-        instances(0),
-        loading_errors(0),
-        process_type(process_type) {}
-
-  // This constructor is only used by the map to return some default value for
-  // an index for which no value has been assigned.
-  ChildProcessStats()
-      : process_launches(0),
-        process_crashes(0),
-        instances(0),
-        loading_errors(0),
-        process_type(content::PROCESS_TYPE_UNKNOWN) {}
-
-  // The number of times that the given child process has been launched
-  int process_launches;
-
-  // The number of times that the given child process has crashed
-  int process_crashes;
-
-  // The number of instances of this child process that have been created.
-  // An instance is a DOM object rendered by this child process during a page
-  // load.
-  int instances;
-
-  // The number of times there was an error loading an instance of this child
-  // process.
-  int loading_errors;
-
-  int process_type;
-};
-
 // static
 void MetricsService::RegisterPrefs(PrefRegistrySimple* registry) {
   DCHECK(IsSingleThreaded());
@@ -414,6 +372,11 @@ void MetricsService::RegisterPrefs(PrefRegistrySimple* registry) {
   // TODO(asvitkine): Move this out of here.
   AndroidMetricsProvider::RegisterPrefs(registry);
 #endif  // defined(OS_ANDROID)
+
+#if defined(ENABLE_PLUGINS)
+  // TODO(asvitkine): Move this out of here.
+  PluginMetricsProvider::RegisterPrefs(registry);
+#endif
 }
 
 MetricsService::MetricsService(metrics::MetricsStateManager* state_manager,
@@ -458,6 +421,14 @@ MetricsService::MetricsService(metrics::MetricsStateManager* state_manager,
   RegisterMetricsProvider(scoped_ptr<metrics::MetricsProvider>(
       google_update_metrics_provider_));
 #endif
+
+#if defined(ENABLE_PLUGINS)
+  plugin_metrics_provider_ = new PluginMetricsProvider(
+      g_browser_process->local_state());
+  RegisterMetricsProvider(scoped_ptr<metrics::MetricsProvider>(
+      plugin_metrics_provider_));
+#endif
+
   BrowserChildProcessObserver::Add(this);
 }
 
@@ -592,23 +563,17 @@ void MetricsService::InconsistencyDetectedInLoggedCount(int amount) {
                        std::abs(amount));
 }
 
-void MetricsService::BrowserChildProcessHostConnected(
-    const content::ChildProcessData& data) {
-  GetChildProcessStats(data).process_launches++;
-}
-
 void MetricsService::BrowserChildProcessCrashed(
     const content::ChildProcessData& data) {
-  GetChildProcessStats(data).process_crashes++;
+  // TODO(asvitkine): Move this into ChromeStabilityStatsProvider.
+#if defined(ENABLE_PLUGINS)
   // Exclude plugin crashes from the count below because we report them via
   // a separate UMA metric.
-  if (!IsPluginProcess(data.process_type))
-    IncrementPrefValue(prefs::kStabilityChildProcessCrashCount);
-}
+  if (PluginMetricsProvider::IsPluginProcess(data.process_type))
+    return;
+#endif
 
-void MetricsService::BrowserChildProcessInstanceCreated(
-    const content::ChildProcessData& data) {
-  GetChildProcessStats(data).instances++;
+  IncrementPrefValue(prefs::kStabilityChildProcessCrashCount);
 }
 
 void MetricsService::HandleIdleSinceLastTransmission(bool in_idle) {
@@ -838,21 +803,19 @@ void MetricsService::OnInitTaskGotHardwareClass(
   DCHECK_EQ(INIT_TASK_SCHEDULED, state_);
   hardware_class_ = hardware_class;
 
-#if defined(ENABLE_PLUGINS)
-  // Start the next part of the init task: loading plugin information.
-  PluginService::GetInstance()->GetPlugins(
+  const base::Closure got_plugin_info_callback =
       base::Bind(&MetricsService::OnInitTaskGotPluginInfo,
-          self_ptr_factory_.GetWeakPtr()));
+                 self_ptr_factory_.GetWeakPtr());
+
+#if defined(ENABLE_PLUGINS)
+  plugin_metrics_provider_->GetPluginInformation(got_plugin_info_callback);
 #else
-  std::vector<content::WebPluginInfo> plugin_list_empty;
-  OnInitTaskGotPluginInfo(plugin_list_empty);
-#endif  // defined(ENABLE_PLUGINS)
+  got_plugin_info_callback.Run();
+#endif
 }
 
-void MetricsService::OnInitTaskGotPluginInfo(
-    const std::vector<content::WebPluginInfo>& plugins) {
+void MetricsService::OnInitTaskGotPluginInfo() {
   DCHECK_EQ(INIT_TASK_SCHEDULED, state_);
-  plugins_ = plugins;
 
   const base::Closure got_metrics_callback =
       base::Bind(&MetricsService::OnInitTaskGotGoogleUpdateData,
@@ -1019,8 +982,7 @@ void MetricsService::CloseCurrentLog() {
   DCHECK(current_log);
   std::vector<variations::ActiveGroupId> synthetic_trials;
   GetCurrentSyntheticFieldTrials(&synthetic_trials);
-  current_log->RecordEnvironment(metrics_providers_.get(), plugins_,
-                                 synthetic_trials);
+  current_log->RecordEnvironment(metrics_providers_.get(), synthetic_trials);
   PrefService* pref = g_browser_process->local_state();
   base::TimeDelta incremental_uptime;
   base::TimeDelta uptime;
@@ -1238,7 +1200,7 @@ void MetricsService::PrepareInitialMetricsLog() {
 
   std::vector<variations::ActiveGroupId> synthetic_trials;
   GetCurrentSyntheticFieldTrials(&synthetic_trials);
-  initial_metrics_log_->RecordEnvironment(metrics_providers_.get(), plugins_,
+  initial_metrics_log_->RecordEnvironment(metrics_providers_.get(),
                                           synthetic_trials);
   PrefService* pref = g_browser_process->local_state();
   base::TimeDelta incremental_uptime;
@@ -1532,120 +1494,10 @@ void MetricsService::LogChromeOSCrash(const std::string &crash_type) {
 #endif  // OS_CHROMEOS
 
 void MetricsService::LogPluginLoadingError(const base::FilePath& plugin_path) {
-  content::WebPluginInfo plugin;
-  bool success =
-      content::PluginService::GetInstance()->GetPluginInfoByPath(plugin_path,
-                                                                 &plugin);
-  DCHECK(success);
-  ChildProcessStats& stats = child_process_stats_buffer_[plugin.name];
-  // Initialize the type if this entry is new.
-  if (stats.process_type == content::PROCESS_TYPE_UNKNOWN) {
-    // The plug-in process might not actually of type PLUGIN (which means
-    // NPAPI), but we only care that it is *a* plug-in process.
-    stats.process_type = content::PROCESS_TYPE_PLUGIN;
-  } else {
-    DCHECK(IsPluginProcess(stats.process_type));
-  }
-  stats.loading_errors++;
-}
-
-MetricsService::ChildProcessStats& MetricsService::GetChildProcessStats(
-    const content::ChildProcessData& data) {
-  const base::string16& child_name = data.name;
-  if (!ContainsKey(child_process_stats_buffer_, child_name)) {
-    child_process_stats_buffer_[child_name] =
-        ChildProcessStats(data.process_type);
-  }
-  return child_process_stats_buffer_[child_name];
-}
-
-void MetricsService::RecordPluginChanges(PrefService* pref) {
-  ListPrefUpdate update(pref, prefs::kStabilityPluginStats);
-  base::ListValue* plugins = update.Get();
-  DCHECK(plugins);
-
-  for (base::ListValue::iterator value_iter = plugins->begin();
-       value_iter != plugins->end(); ++value_iter) {
-    if (!(*value_iter)->IsType(base::Value::TYPE_DICTIONARY)) {
-      NOTREACHED();
-      continue;
-    }
-
-    base::DictionaryValue* plugin_dict =
-        static_cast<base::DictionaryValue*>(*value_iter);
-    std::string plugin_name;
-    plugin_dict->GetString(prefs::kStabilityPluginName, &plugin_name);
-    if (plugin_name.empty()) {
-      NOTREACHED();
-      continue;
-    }
-
-    // TODO(viettrungluu): remove conversions
-    base::string16 name16 = base::UTF8ToUTF16(plugin_name);
-    if (child_process_stats_buffer_.find(name16) ==
-        child_process_stats_buffer_.end()) {
-      continue;
-    }
-
-    ChildProcessStats stats = child_process_stats_buffer_[name16];
-    if (stats.process_launches) {
-      int launches = 0;
-      plugin_dict->GetInteger(prefs::kStabilityPluginLaunches, &launches);
-      launches += stats.process_launches;
-      plugin_dict->SetInteger(prefs::kStabilityPluginLaunches, launches);
-    }
-    if (stats.process_crashes) {
-      int crashes = 0;
-      plugin_dict->GetInteger(prefs::kStabilityPluginCrashes, &crashes);
-      crashes += stats.process_crashes;
-      plugin_dict->SetInteger(prefs::kStabilityPluginCrashes, crashes);
-    }
-    if (stats.instances) {
-      int instances = 0;
-      plugin_dict->GetInteger(prefs::kStabilityPluginInstances, &instances);
-      instances += stats.instances;
-      plugin_dict->SetInteger(prefs::kStabilityPluginInstances, instances);
-    }
-    if (stats.loading_errors) {
-      int loading_errors = 0;
-      plugin_dict->GetInteger(prefs::kStabilityPluginLoadingErrors,
-                              &loading_errors);
-      loading_errors += stats.loading_errors;
-      plugin_dict->SetInteger(prefs::kStabilityPluginLoadingErrors,
-                              loading_errors);
-    }
-
-    child_process_stats_buffer_.erase(name16);
-  }
-
-  // Now go through and add dictionaries for plugins that didn't already have
-  // reports in Local State.
-  for (std::map<base::string16, ChildProcessStats>::iterator cache_iter =
-           child_process_stats_buffer_.begin();
-       cache_iter != child_process_stats_buffer_.end(); ++cache_iter) {
-    ChildProcessStats stats = cache_iter->second;
-
-    // Insert only plugins information into the plugins list.
-    if (!IsPluginProcess(stats.process_type))
-      continue;
-
-    // TODO(viettrungluu): remove conversion
-    std::string plugin_name = base::UTF16ToUTF8(cache_iter->first);
-
-    base::DictionaryValue* plugin_dict = new base::DictionaryValue;
-
-    plugin_dict->SetString(prefs::kStabilityPluginName, plugin_name);
-    plugin_dict->SetInteger(prefs::kStabilityPluginLaunches,
-                            stats.process_launches);
-    plugin_dict->SetInteger(prefs::kStabilityPluginCrashes,
-                            stats.process_crashes);
-    plugin_dict->SetInteger(prefs::kStabilityPluginInstances,
-                            stats.instances);
-    plugin_dict->SetInteger(prefs::kStabilityPluginLoadingErrors,
-                            stats.loading_errors);
-    plugins->Append(plugin_dict);
-  }
-  child_process_stats_buffer_.clear();
+#if defined(ENABLE_PLUGINS)
+  // TODO(asvitkine): Move this out of here.
+  plugin_metrics_provider_->LogPluginLoadingError(plugin_path);
+#endif
 }
 
 bool MetricsService::ShouldLogEvents() {
@@ -1668,12 +1520,8 @@ void MetricsService::RecordBooleanPrefValue(const char* path, bool value) {
 void MetricsService::RecordCurrentState(PrefService* pref) {
   pref->SetInt64(prefs::kStabilityLastTimestampSec, Time::Now().ToTimeT());
 
-  RecordPluginChanges(pref);
+#if defined(ENABLE_PLUGINS)
+  plugin_metrics_provider_->RecordPluginChanges();
+#endif
 }
 
-// static
-bool MetricsService::IsPluginProcess(int process_type) {
-  return (process_type == content::PROCESS_TYPE_PLUGIN ||
-          process_type == content::PROCESS_TYPE_PPAPI_PLUGIN ||
-          process_type == content::PROCESS_TYPE_PPAPI_BROKER);
-}
diff --git a/chrome/browser/metrics/metrics_service.h b/chrome/browser/metrics/metrics_service.h
index f229028..dbd91b4 100644
--- a/chrome/browser/metrics/metrics_service.h
+++ b/chrome/browser/metrics/metrics_service.h
@@ -39,6 +39,7 @@ class GoogleUpdateMetricsProviderWin;
 class MetricsReportingScheduler;
 class PrefService;
 class PrefRegistrySimple;
+class PluginMetricsProvider;
 
 namespace base {
 class DictionaryValue;
@@ -51,7 +52,6 @@ struct ActiveGroupId;
 }
 
 namespace content {
-struct WebPluginInfo;
 }
 
 namespace metrics {
@@ -171,12 +171,8 @@ class MetricsService
   virtual void InconsistencyDetectedInLoggedCount(int amount) OVERRIDE;
 
   // Implementation of 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;
 
   // This should be called when the application is not idle, i.e. the user seems
   // to be interacting with the application.
@@ -274,8 +270,6 @@ class MetricsService
     NEED_TO_SHUTDOWN = ~CLEANLY_SHUTDOWN
   };
 
-  struct ChildProcessStats;
-
   typedef std::vector<SyntheticTrialGroup> SyntheticTrialGroups;
 
   // First part of the init task. Called on the FILE thread to load hardware
@@ -287,10 +281,9 @@ class MetricsService
   // loading plugin information.
   void OnInitTaskGotHardwareClass(const std::string& hardware_class);
 
-  // Callback from PluginService::GetPlugins() that continues the init task by
-  // launching a task to gather Google Update statistics.
-  void OnInitTaskGotPluginInfo(
-      const std::vector<content::WebPluginInfo>& plugins);
+  // Called after the Plugin init task has been completed that continues the
+  // init task by launching a task to gather Google Update statistics.
+  void OnInitTaskGotPluginInfo();
 
   // Called after GoogleUpdate init task has been completed that continues the
   // init task by loading profiler data.
@@ -400,14 +393,6 @@ class MetricsService
   // Records that the browser was shut down cleanly.
   void LogCleanShutdown();
 
-  // Returns reference to ChildProcessStats corresponding to |data|.
-  ChildProcessStats& GetChildProcessStats(
-      const content::ChildProcessData& data);
-
-  // 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(PrefService* pref);
-
   // Records state that should be periodically saved, like uptime and
   // buffered plugin stability statistics.
   void RecordCurrentState(PrefService* pref);
@@ -418,10 +403,6 @@ class MetricsService
   // Sets the value of the specified path in prefs and schedules a save.
   void RecordBooleanPrefValue(const char* path, bool value);
 
-  // Returns true if process of type |type| should be counted as a plugin
-  // process, and false otherwise.
-  static bool IsPluginProcess(int process_type);
-
   // Returns a list of synthetic field trials that were active for the entire
   // duration of the current log.
   void GetCurrentSyntheticFieldTrials(
@@ -480,8 +461,9 @@ class MetricsService
   // empty string.
   std::string hardware_class_;
 
-  // The list of plugins which was retrieved on the file thread.
-  std::vector<content::WebPluginInfo> plugins_;
+#if defined(ENABLE_PLUGINS)
+  PluginMetricsProvider* plugin_metrics_provider_;
+#endif
 
 #if defined(OS_WIN)
   GoogleUpdateMetricsProviderWin* google_update_metrics_provider_;
@@ -509,9 +491,6 @@ class MetricsService
   WindowMap window_map_;
   int next_window_id_;
 
-  // Buffer of child process notifications for quick access.
-  std::map<base::string16, ChildProcessStats> child_process_stats_buffer_;
-
   // Weak pointers factory used to post task on different threads. All weak
   // pointers managed by this factory have the same lifetime as MetricsService.
   base::WeakPtrFactory<MetricsService> self_ptr_factory_;
diff --git a/chrome/browser/metrics/metrics_service_unittest.cc b/chrome/browser/metrics/metrics_service_unittest.cc
index 7985361..33aea72 100644
--- a/chrome/browser/metrics/metrics_service_unittest.cc
+++ b/chrome/browser/metrics/metrics_service_unittest.cc
@@ -16,8 +16,6 @@
 #include "components/metrics/metrics_service_observer.h"
 #include "components/metrics/test_metrics_service_client.h"
 #include "components/variations/metrics_util.h"
-#include "content/public/common/process_type.h"
-#include "content/public/common/webplugininfo.h"
 #include "content/public/test/test_browser_thread_bundle.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gfx/size.h"
@@ -172,15 +170,6 @@ class TestMetricsServiceObserver : public MetricsServiceObserver {
 
 }  // namespace
 
-TEST_F(MetricsServiceTest, IsPluginProcess) {
-  EXPECT_TRUE(
-      MetricsService::IsPluginProcess(content::PROCESS_TYPE_PLUGIN));
-  EXPECT_TRUE(
-      MetricsService::IsPluginProcess(content::PROCESS_TYPE_PPAPI_PLUGIN));
-  EXPECT_FALSE(
-      MetricsService::IsPluginProcess(content::PROCESS_TYPE_GPU));
-}
-
 TEST_F(MetricsServiceTest, InitialStabilityLogAfterCleanShutDown) {
   EnableMetricsReporting();
   GetLocalState()->SetBoolean(prefs::kStabilityExitedCleanly, true);
@@ -204,7 +193,6 @@ TEST_F(MetricsServiceTest, InitialStabilityLogAfterCrash) {
   metrics::TestMetricsServiceClient client;
   TestMetricsLog log("client", 1, &client);
   log.RecordEnvironment(std::vector<metrics::MetricsProvider*>(),
-                        std::vector<content::WebPluginInfo>(),
                         std::vector<variations::ActiveGroupId>());
 
   // Record stability build time and version from previous session, so that
diff --git a/chrome/browser/metrics/plugin_metrics_provider.cc b/chrome/browser/metrics/plugin_metrics_provider.cc
new file mode 100644
index 0000000..e7633cf
--- /dev/null
+++ b/chrome/browser/metrics/plugin_metrics_provider.cc
@@ -0,0 +1,350 @@
+// 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.
+
+#include "chrome/browser/metrics/plugin_metrics_provider.h"
+
+#include <string>
+
+#include "base/prefs/pref_registry_simple.h"
+#include "base/prefs/pref_service.h"
+#include "base/prefs/scoped_user_pref_update.h"
+#include "base/stl_util.h"
+#include "base/strings/utf_string_conversions.h"
+#include "chrome/browser/browser_process.h"
+#include "chrome/browser/plugins/plugin_prefs.h"
+#include "chrome/browser/profiles/profile_manager.h"
+#include "chrome/common/pref_names.h"
+#include "components/metrics/proto/system_profile.pb.h"
+#include "content/public/browser/child_process_data.h"
+#include "content/public/browser/plugin_service.h"
+#include "content/public/common/process_type.h"
+#include "content/public/common/webplugininfo.h"
+
+namespace {
+
+// Returns the plugin preferences corresponding for this user, if available.
+// If multiple user profiles are loaded, returns the preferences corresponding
+// to an arbitrary one of the profiles.
+PluginPrefs* GetPluginPrefs() {
+  ProfileManager* profile_manager = g_browser_process->profile_manager();
+
+  if (!profile_manager) {
+    // The profile manager can be NULL when testing.
+    return NULL;
+  }
+
+  std::vector<Profile*> profiles = profile_manager->GetLoadedProfiles();
+  if (profiles.empty())
+    return NULL;
+
+  return PluginPrefs::GetForProfile(profiles.front()).get();
+}
+
+// Fills |plugin| with the info contained in |plugin_info| and |plugin_prefs|.
+void SetPluginInfo(const content::WebPluginInfo& plugin_info,
+                   const PluginPrefs* plugin_prefs,
+                   metrics::SystemProfileProto::Plugin* plugin) {
+  plugin->set_name(base::UTF16ToUTF8(plugin_info.name));
+  plugin->set_filename(plugin_info.path.BaseName().AsUTF8Unsafe());
+  plugin->set_version(base::UTF16ToUTF8(plugin_info.version));
+  plugin->set_is_pepper(plugin_info.is_pepper_plugin());
+  if (plugin_prefs)
+    plugin->set_is_disabled(!plugin_prefs->IsPluginEnabled(plugin_info));
+}
+
+}  // namespace
+
+// This is used to quickly log stats from child process related notifications in
+// PluginMetricsProvider::child_stats_buffer_.  The buffer's contents are
+// transferred out when Local State is periodically saved.  The information is
+// then reported to the UMA server on next launch.
+struct PluginMetricsProvider::ChildProcessStats {
+ public:
+  explicit ChildProcessStats(int process_type)
+      : process_launches(0),
+        process_crashes(0),
+        instances(0),
+        loading_errors(0),
+        process_type(process_type) {}
+
+  // This constructor is only used by the map to return some default value for
+  // an index for which no value has been assigned.
+  ChildProcessStats()
+      : process_launches(0),
+        process_crashes(0),
+        instances(0),
+        loading_errors(0),
+        process_type(content::PROCESS_TYPE_UNKNOWN) {}
+
+  // The number of times that the given child process has been launched
+  int process_launches;
+
+  // The number of times that the given child process has crashed
+  int process_crashes;
+
+  // The number of instances of this child process that have been created.
+  // An instance is a DOM object rendered by this child process during a page
+  // load.
+  int instances;
+
+  // The number of times there was an error loading an instance of this child
+  // process.
+  int loading_errors;
+
+  int process_type;
+};
+
+PluginMetricsProvider::PluginMetricsProvider(PrefService* local_state)
+    : local_state_(local_state),
+      weak_ptr_factory_(this) {
+  DCHECK(local_state_);
+
+  BrowserChildProcessObserver::Add(this);
+}
+
+PluginMetricsProvider::~PluginMetricsProvider() {
+  BrowserChildProcessObserver::Remove(this);
+}
+
+void PluginMetricsProvider::GetPluginInformation(
+    const base::Closure& done_callback) {
+  content::PluginService::GetInstance()->GetPlugins(
+      base::Bind(&PluginMetricsProvider::OnGotPlugins,
+                 weak_ptr_factory_.GetWeakPtr(),
+                 done_callback));
+}
+
+void PluginMetricsProvider::ProvideSystemProfileMetrics(
+    metrics::SystemProfileProto* system_profile_proto) {
+  PluginPrefs* plugin_prefs = GetPluginPrefs();
+  for (size_t i = 0; i < plugins_.size(); ++i) {
+    SetPluginInfo(plugins_[i], plugin_prefs,
+                  system_profile_proto->add_plugin());
+  }
+}
+
+void PluginMetricsProvider::ProvideStabilityMetrics(
+    metrics::SystemProfileProto* system_profile_proto) {
+  const base::ListValue* plugin_stats_list = local_state_->GetList(
+      prefs::kStabilityPluginStats);
+  if (!plugin_stats_list)
+    return;
+
+  metrics::SystemProfileProto::Stability* stability =
+      system_profile_proto->mutable_stability();
+  for (base::ListValue::const_iterator iter = plugin_stats_list->begin();
+       iter != plugin_stats_list->end(); ++iter) {
+    if (!(*iter)->IsType(base::Value::TYPE_DICTIONARY)) {
+      NOTREACHED();
+      continue;
+    }
+    base::DictionaryValue* plugin_dict =
+        static_cast<base::DictionaryValue*>(*iter);
+
+    // Note that this search is potentially a quadratic operation, but given the
+    // low number of plugins installed on a "reasonable" setup, this should be
+    // fine.
+    // TODO(isherman): Verify that this does not show up as a hotspot in
+    // profiler runs.
+    const metrics::SystemProfileProto::Plugin* system_profile_plugin = NULL;
+    std::string plugin_name;
+    plugin_dict->GetString(prefs::kStabilityPluginName, &plugin_name);
+    for (int i = 0; i < system_profile_proto->plugin_size(); ++i) {
+      if (system_profile_proto->plugin(i).name() == plugin_name) {
+        system_profile_plugin = &system_profile_proto->plugin(i);
+        break;
+      }
+    }
+
+    if (!system_profile_plugin) {
+      NOTREACHED();
+      continue;
+    }
+
+    metrics::SystemProfileProto::Stability::PluginStability* plugin_stability =
+        stability->add_plugin_stability();
+    *plugin_stability->mutable_plugin() = *system_profile_plugin;
+
+    int launches = 0;
+    plugin_dict->GetInteger(prefs::kStabilityPluginLaunches, &launches);
+    if (launches > 0)
+      plugin_stability->set_launch_count(launches);
+
+    int instances = 0;
+    plugin_dict->GetInteger(prefs::kStabilityPluginInstances, &instances);
+    if (instances > 0)
+      plugin_stability->set_instance_count(instances);
+
+    int crashes = 0;
+    plugin_dict->GetInteger(prefs::kStabilityPluginCrashes, &crashes);
+    if (crashes > 0)
+      plugin_stability->set_crash_count(crashes);
+
+    int loading_errors = 0;
+    plugin_dict->GetInteger(prefs::kStabilityPluginLoadingErrors,
+                            &loading_errors);
+    if (loading_errors > 0)
+      plugin_stability->set_loading_error_count(loading_errors);
+  }
+
+  local_state_->ClearPref(prefs::kStabilityPluginStats);
+}
+
+void PluginMetricsProvider::RecordPluginChanges() {
+  ListPrefUpdate update(local_state_, prefs::kStabilityPluginStats);
+  base::ListValue* plugins = update.Get();
+  DCHECK(plugins);
+
+  for (base::ListValue::iterator value_iter = plugins->begin();
+       value_iter != plugins->end(); ++value_iter) {
+    if (!(*value_iter)->IsType(base::Value::TYPE_DICTIONARY)) {
+      NOTREACHED();
+      continue;
+    }
+
+    base::DictionaryValue* plugin_dict =
+        static_cast<base::DictionaryValue*>(*value_iter);
+    std::string plugin_name;
+    plugin_dict->GetString(prefs::kStabilityPluginName, &plugin_name);
+    if (plugin_name.empty()) {
+      NOTREACHED();
+      continue;
+    }
+
+    // TODO(viettrungluu): remove conversions
+    base::string16 name16 = base::UTF8ToUTF16(plugin_name);
+    if (child_process_stats_buffer_.find(name16) ==
+        child_process_stats_buffer_.end()) {
+      continue;
+    }
+
+    ChildProcessStats stats = child_process_stats_buffer_[name16];
+    if (stats.process_launches) {
+      int launches = 0;
+      plugin_dict->GetInteger(prefs::kStabilityPluginLaunches, &launches);
+      launches += stats.process_launches;
+      plugin_dict->SetInteger(prefs::kStabilityPluginLaunches, launches);
+    }
+    if (stats.process_crashes) {
+      int crashes = 0;
+      plugin_dict->GetInteger(prefs::kStabilityPluginCrashes, &crashes);
+      crashes += stats.process_crashes;
+      plugin_dict->SetInteger(prefs::kStabilityPluginCrashes, crashes);
+    }
+    if (stats.instances) {
+      int instances = 0;
+      plugin_dict->GetInteger(prefs::kStabilityPluginInstances, &instances);
+      instances += stats.instances;
+      plugin_dict->SetInteger(prefs::kStabilityPluginInstances, instances);
+    }
+    if (stats.loading_errors) {
+      int loading_errors = 0;
+      plugin_dict->GetInteger(prefs::kStabilityPluginLoadingErrors,
+                              &loading_errors);
+      loading_errors += stats.loading_errors;
+      plugin_dict->SetInteger(prefs::kStabilityPluginLoadingErrors,
+                              loading_errors);
+    }
+
+    child_process_stats_buffer_.erase(name16);
+  }
+
+  // Now go through and add dictionaries for plugins that didn't already have
+  // reports in Local State.
+  for (std::map<base::string16, ChildProcessStats>::iterator cache_iter =
+           child_process_stats_buffer_.begin();
+       cache_iter != child_process_stats_buffer_.end(); ++cache_iter) {
+    ChildProcessStats stats = cache_iter->second;
+
+    // Insert only plugins information into the plugins list.
+    if (!IsPluginProcess(stats.process_type))
+      continue;
+
+    // TODO(viettrungluu): remove conversion
+    std::string plugin_name = base::UTF16ToUTF8(cache_iter->first);
+
+    base::DictionaryValue* plugin_dict = new base::DictionaryValue;
+
+    plugin_dict->SetString(prefs::kStabilityPluginName, plugin_name);
+    plugin_dict->SetInteger(prefs::kStabilityPluginLaunches,
+                            stats.process_launches);
+    plugin_dict->SetInteger(prefs::kStabilityPluginCrashes,
+                            stats.process_crashes);
+    plugin_dict->SetInteger(prefs::kStabilityPluginInstances,
+                            stats.instances);
+    plugin_dict->SetInteger(prefs::kStabilityPluginLoadingErrors,
+                            stats.loading_errors);
+    plugins->Append(plugin_dict);
+  }
+  child_process_stats_buffer_.clear();
+}
+
+void PluginMetricsProvider::LogPluginLoadingError(
+    const base::FilePath& plugin_path) {
+  content::WebPluginInfo plugin;
+  bool success =
+      content::PluginService::GetInstance()->GetPluginInfoByPath(plugin_path,
+                                                                 &plugin);
+  DCHECK(success);
+  ChildProcessStats& stats = child_process_stats_buffer_[plugin.name];
+  // Initialize the type if this entry is new.
+  if (stats.process_type == content::PROCESS_TYPE_UNKNOWN) {
+    // The plug-in process might not actually be of type PLUGIN (which means
+    // NPAPI), but we only care that it is *a* plug-in process.
+    stats.process_type = content::PROCESS_TYPE_PLUGIN;
+  } else {
+    DCHECK(IsPluginProcess(stats.process_type));
+  }
+  stats.loading_errors++;
+}
+
+void PluginMetricsProvider::SetPluginsForTesting(
+    const std::vector<content::WebPluginInfo>& plugins) {
+  plugins_ = plugins;
+}
+
+// static
+bool PluginMetricsProvider::IsPluginProcess(int process_type) {
+  return (process_type == content::PROCESS_TYPE_PLUGIN ||
+          process_type == content::PROCESS_TYPE_PPAPI_PLUGIN ||
+          process_type == content::PROCESS_TYPE_PPAPI_BROKER);
+}
+
+// static
+void PluginMetricsProvider::RegisterPrefs(PrefRegistrySimple* registry) {
+  registry->RegisterListPref(prefs::kStabilityPluginStats);
+}
+
+void PluginMetricsProvider::OnGotPlugins(
+    const base::Closure& done_callback,
+    const std::vector<content::WebPluginInfo>& plugins) {
+  plugins_ = plugins;
+  done_callback.Run();
+}
+
+PluginMetricsProvider::ChildProcessStats&
+PluginMetricsProvider::GetChildProcessStats(
+    const content::ChildProcessData& data) {
+  const base::string16& child_name = data.name;
+  if (!ContainsKey(child_process_stats_buffer_, child_name)) {
+    child_process_stats_buffer_[child_name] =
+        ChildProcessStats(data.process_type);
+  }
+  return child_process_stats_buffer_[child_name];
+}
+
+void PluginMetricsProvider::BrowserChildProcessHostConnected(
+    const content::ChildProcessData& data) {
+  GetChildProcessStats(data).process_launches++;
+}
+
+void PluginMetricsProvider::BrowserChildProcessCrashed(
+    const content::ChildProcessData& data) {
+  GetChildProcessStats(data).process_crashes++;
+}
+
+void PluginMetricsProvider::BrowserChildProcessInstanceCreated(
+    const content::ChildProcessData& data) {
+  GetChildProcessStats(data).instances++;
+}
diff --git a/chrome/browser/metrics/plugin_metrics_provider.h b/chrome/browser/metrics/plugin_metrics_provider.h
new file mode 100644
index 0000000..14ba222
--- /dev/null
+++ b/chrome/browser/metrics/plugin_metrics_provider.h
@@ -0,0 +1,95 @@
+// 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);
+
+  // Returns true if process of type |type| should be counted as a plugin
+  // process, and false otherwise.
+  static bool IsPluginProcess(int process_type);
+
+  // 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_
diff --git a/chrome/browser/metrics/plugin_metrics_provider_unittest.cc b/chrome/browser/metrics/plugin_metrics_provider_unittest.cc
new file mode 100644
index 0000000..dc96191
--- /dev/null
+++ b/chrome/browser/metrics/plugin_metrics_provider_unittest.cc
@@ -0,0 +1,102 @@
+// 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.
+
+#include "chrome/browser/metrics/plugin_metrics_provider.h"
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/prefs/pref_service.h"
+#include "base/prefs/scoped_user_pref_update.h"
+#include "base/prefs/testing_pref_service.h"
+#include "base/strings/utf_string_conversions.h"
+#include "chrome/common/pref_names.h"
+#include "components/metrics/proto/system_profile.pb.h"
+#include "content/public/common/process_type.h"
+#include "content/public/common/webplugininfo.h"
+#include "content/public/test/test_browser_thread_bundle.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace {
+
+content::WebPluginInfo CreateFakePluginInfo(
+    const std::string& name,
+    const base::FilePath::CharType* path,
+    const std::string& version,
+    bool is_pepper) {
+  content::WebPluginInfo plugin(base::UTF8ToUTF16(name),
+                                base::FilePath(path),
+                                base::UTF8ToUTF16(version),
+                                base::string16());
+  if (is_pepper)
+    plugin.type = content::WebPluginInfo::PLUGIN_TYPE_PEPPER_IN_PROCESS;
+  else
+    plugin.type = content::WebPluginInfo::PLUGIN_TYPE_NPAPI;
+  return plugin;
+}
+
+}  // namespace
+
+TEST(PluginMetricsProviderTest, IsPluginProcess) {
+  EXPECT_TRUE(PluginMetricsProvider::IsPluginProcess(
+      content::PROCESS_TYPE_PLUGIN));
+  EXPECT_TRUE(PluginMetricsProvider::IsPluginProcess(
+      content::PROCESS_TYPE_PPAPI_PLUGIN));
+  EXPECT_FALSE(PluginMetricsProvider::IsPluginProcess(
+      content::PROCESS_TYPE_GPU));
+}
+
+TEST(PluginMetricsProviderTest, Plugins) {
+  content::TestBrowserThreadBundle thread_bundle;
+
+  TestingPrefServiceSimple prefs;
+  PluginMetricsProvider::RegisterPrefs(prefs.registry());
+  PluginMetricsProvider provider(&prefs);
+
+  std::vector<content::WebPluginInfo> plugins;
+  plugins.push_back(CreateFakePluginInfo("p1", FILE_PATH_LITERAL("p1.plugin"),
+                                         "1.5", true));
+  plugins.push_back(CreateFakePluginInfo("p2", FILE_PATH_LITERAL("p2.plugin"),
+                                         "2.0", false));
+  provider.SetPluginsForTesting(plugins);
+
+  metrics::SystemProfileProto system_profile;
+  provider.ProvideSystemProfileMetrics(&system_profile);
+
+  ASSERT_EQ(2, system_profile.plugin_size());
+  EXPECT_EQ("p1", system_profile.plugin(0).name());
+  EXPECT_EQ("p1.plugin", system_profile.plugin(0).filename());
+  EXPECT_EQ("1.5", system_profile.plugin(0).version());
+  EXPECT_TRUE(system_profile.plugin(0).is_pepper());
+  EXPECT_EQ("p2", system_profile.plugin(1).name());
+  EXPECT_EQ("p2.plugin", system_profile.plugin(1).filename());
+  EXPECT_EQ("2.0", system_profile.plugin(1).version());
+  EXPECT_FALSE(system_profile.plugin(1).is_pepper());
+
+  // Now set some plugin stability stats for p2 and verify they're recorded.
+  scoped_ptr<base::DictionaryValue> plugin_dict(new base::DictionaryValue);
+  plugin_dict->SetString(prefs::kStabilityPluginName, "p2");
+  plugin_dict->SetInteger(prefs::kStabilityPluginLaunches, 1);
+  plugin_dict->SetInteger(prefs::kStabilityPluginCrashes, 2);
+  plugin_dict->SetInteger(prefs::kStabilityPluginInstances, 3);
+  plugin_dict->SetInteger(prefs::kStabilityPluginLoadingErrors, 4);
+  {
+    ListPrefUpdate update(&prefs, prefs::kStabilityPluginStats);
+    update.Get()->Append(plugin_dict.release());
+  }
+
+  provider.ProvideStabilityMetrics(&system_profile);
+
+  const metrics::SystemProfileProto_Stability& stability =
+      system_profile.stability();
+  ASSERT_EQ(1, stability.plugin_stability_size());
+  EXPECT_EQ("p2", stability.plugin_stability(0).plugin().name());
+  EXPECT_EQ("p2.plugin", stability.plugin_stability(0).plugin().filename());
+  EXPECT_EQ("2.0", stability.plugin_stability(0).plugin().version());
+  EXPECT_FALSE(stability.plugin_stability(0).plugin().is_pepper());
+  EXPECT_EQ(1, stability.plugin_stability(0).launch_count());
+  EXPECT_EQ(2, stability.plugin_stability(0).crash_count());
+  EXPECT_EQ(3, stability.plugin_stability(0).instance_count());
+  EXPECT_EQ(4, stability.plugin_stability(0).loading_error_count());
+}
diff --git a/chrome/browser/prefs/browser_prefs.cc b/chrome/browser/prefs/browser_prefs.cc
index 9c50ef9..a63cf83 100644
--- a/chrome/browser/prefs/browser_prefs.cc
+++ b/chrome/browser/prefs/browser_prefs.cc
@@ -38,7 +38,6 @@
 #include "chrome/browser/media/media_capture_devices_dispatcher.h"
 #include "chrome/browser/media/media_device_id_salt.h"
 #include "chrome/browser/media/media_stream_devices_controller.h"
-#include "chrome/browser/metrics/metrics_log.h"
 #include "chrome/browser/metrics/metrics_service.h"
 #include "chrome/browser/metrics/variations/variations_service.h"
 #include "chrome/browser/net/http_server_properties_manager.h"
@@ -232,7 +231,6 @@ void RegisterLocalState(PrefRegistrySimple* registry) {
   IntranetRedirectDetector::RegisterPrefs(registry);
   IOThread::RegisterPrefs(registry);
   KeywordEditorController::RegisterPrefs(registry);
-  MetricsLog::RegisterPrefs(registry);
   MetricsService::RegisterPrefs(registry);
   PrefProxyConfigTrackerImpl::RegisterPrefs(registry);
   ProfileInfoCache::RegisterPrefs(registry);
diff --git a/chrome/chrome_browser.gypi b/chrome/chrome_browser.gypi
index 0a7684a..711e45c 100644
--- a/chrome/chrome_browser.gypi
+++ b/chrome/chrome_browser.gypi
@@ -1218,6 +1218,8 @@
         'browser/metrics/omnibox_metrics_provider.h',
         'browser/metrics/perf_provider_chromeos.cc',
         'browser/metrics/perf_provider_chromeos.h',
+        'browser/metrics/plugin_metrics_provider.cc',
+        'browser/metrics/plugin_metrics_provider.h',
         'browser/metrics/thread_watcher.cc',
         'browser/metrics/thread_watcher.h',
         'browser/metrics/thread_watcher_android.cc',
@@ -2863,6 +2865,7 @@
         }, {  # enable_plugins==0
           'sources/': [
             ['exclude', '^browser/guest_view/web_view/plugin_permission_helper'],
+            ['exclude', '^browser/metrics/plugin_metrics_provider'],
             ['exclude', '^browser/pepper_'],
             ['exclude', '^browser/plugins/'],
             ['exclude', '^browser/renderer_host/pepper/'],
diff --git a/chrome/chrome_tests_unit.gypi b/chrome/chrome_tests_unit.gypi
index 6debf0a..8b0031b 100644
--- a/chrome/chrome_tests_unit.gypi
+++ b/chrome/chrome_tests_unit.gypi
@@ -1087,6 +1087,7 @@
         'browser/metrics/metrics_log_unittest.cc',
         'browser/metrics/metrics_service_unittest.cc',
         'browser/metrics/metrics_state_manager_unittest.cc',
+        'browser/metrics/plugin_metrics_provider_unittest.cc',
         'browser/metrics/thread_watcher_unittest.cc',
         'browser/metrics/thread_watcher_android_unittest.cc',
         'browser/metrics/time_ticks_experiment_unittest.cc',
@@ -2247,7 +2248,7 @@
             ['exclude', '^browser/plugins/'],
           ],
           'sources!': [
-            'browser/plugins/plugin_info_message_filter_unittest.cc',
+            'browser/metrics/plugin_metrics_provider_unittest.cc',
           ],
         }],
         ['enable_printing!=1', {
diff --git a/components/metrics/metrics_provider.h b/components/metrics/metrics_provider.h
index 5e48543..76d4f44 100644
--- a/components/metrics/metrics_provider.h
+++ b/components/metrics/metrics_provider.h
@@ -34,7 +34,7 @@ class MetricsProvider {
   // directly into |stability_proto| fields or by logging stability histograms
   // via the UMA_STABILITY_HISTOGRAM_ENUMERATION() macro.
   virtual void ProvideStabilityMetrics(
-      SystemProfileProto_Stability* stability_proto) {}
+      SystemProfileProto* system_profile_proto) {}
 
   // Provides general metrics that are neither system profile nor stability
   // metrics.