Move pref and switch in preparation for metrics componentization

Code will shortly be componentized into the metrics component that uses
prefs::kMetricsReportingEnabled and switches::kForceFieldTrials. To enable that
componentization, this CL does the following:

- Moves prefs::kMetricsReportingEnabled into the metrics component.
- Moves switches:kForceFieldTrials from //content to //base to enable it to be
  used both by //content and by the metrics component.

BUG=508014

Committed: https://crrev.com/71f7da5a323ce64e8bc5b3ff2a62fc60e3c71bd0
Cr-Commit-Position: refs/heads/master@{#351268}

Review URL: https://codereview.chromium.org/1373823002

Cr-Commit-Position: refs/heads/master@{#351294}

22 files changed, 43 insertions, 42 deletions

diff --git a/base/base_switches.cc b/base/base_switches.cc
index 7f3be7f..76827b8 100644
--- a/base/base_switches.cc
+++ b/base/base_switches.cc
@@ -23,6 +23,16 @@ const char kEnableLowEndDeviceMode[]        = "enable-low-end-device-mode";
 // Force disabling of low-end device mode when set.
 const char kDisableLowEndDeviceMode[]       = "disable-low-end-device-mode";
 
+// This option can be used to force field trials when testing changes locally.
+// The argument is a list of name and value pairs, separated by slashes. If a
+// trial name is prefixed with an asterisk, that trial will start activated.
+// For example, the following argument defines two trials, with the second one
+// activated: "GoogleNow/Enable/*MaterialDesignNTP/Default/" This option can
+// also be used by the browser process to send the list of trials to a
+// non-browser process, using the same format. See
+// FieldTrialList::CreateTrialsFromString() in field_trial.h for details.
+const char kForceFieldTrials[]              = "force-fieldtrials";
+
 // Suppresses all error dialogs when present.
 const char kNoErrorDialogs[]                = "noerrdialogs";
 
diff --git a/base/base_switches.h b/base/base_switches.h
index bbd590b..95f6bff 100644
--- a/base/base_switches.h
+++ b/base/base_switches.h
@@ -13,6 +13,7 @@ namespace switches {
 
 extern const char kDisableBreakpad[];
 extern const char kEnableCrashReporter[];
+extern const char kForceFieldTrials[];
 extern const char kFullMemoryCrashReport[];
 extern const char kEnableLowEndDeviceMode[];
 extern const char kDisableLowEndDeviceMode[];
diff --git a/chrome/browser/android/preferences/pref_service_bridge.cc b/chrome/browser/android/preferences/pref_service_bridge.cc
index b1a54f1..963a006 100644
--- a/chrome/browser/android/preferences/pref_service_bridge.cc
+++ b/chrome/browser/android/preferences/pref_service_bridge.cc
@@ -462,20 +462,20 @@ static jboolean GetFullscreenAllowed(JNIEnv* env,
 static jboolean GetMetricsReportingEnabled(JNIEnv* env,
                                            const JavaParamRef<jobject>& obj) {
   PrefService* local_state = g_browser_process->local_state();
-  return local_state->GetBoolean(prefs::kMetricsReportingEnabled);
+  return local_state->GetBoolean(metrics::prefs::kMetricsReportingEnabled);
 }
 
 static void SetMetricsReportingEnabled(JNIEnv* env,
                                        const JavaParamRef<jobject>& obj,
                                        jboolean enabled) {
   PrefService* local_state = g_browser_process->local_state();
-  local_state->SetBoolean(prefs::kMetricsReportingEnabled, enabled);
+  local_state->SetBoolean(metrics::prefs::kMetricsReportingEnabled, enabled);
 }
 
 static jboolean HasSetMetricsReporting(JNIEnv* env,
                                        const JavaParamRef<jobject>& obj) {
   PrefService* local_state = g_browser_process->local_state();
-  return local_state->HasPrefPath(prefs::kMetricsReportingEnabled);
+  return local_state->HasPrefPath(metrics::prefs::kMetricsReportingEnabled);
 }
 
 namespace {
diff --git a/chrome/browser/browser_process_impl.cc b/chrome/browser/browser_process_impl.cc
index 02896d6..5a6d7fd 100644
--- a/chrome/browser/browser_process_impl.cc
+++ b/chrome/browser/browser_process_impl.cc
@@ -822,9 +822,8 @@ void BrowserProcessImpl::RegisterPrefs(PrefRegistrySimple* registry) {
                                std::string());
 #endif  // defined(OS_CHROMEOS)
 #if !defined(OS_CHROMEOS)
-  registry->RegisterBooleanPref(
-      prefs::kMetricsReportingEnabled,
-      GoogleUpdateSettings::GetCollectStatsConsent());
+  registry->RegisterBooleanPref(metrics::prefs::kMetricsReportingEnabled,
+                                GoogleUpdateSettings::GetCollectStatsConsent());
 #endif  // !defined(OS_CHROMEOS)
 
 #if defined(OS_ANDROID)
@@ -1006,7 +1005,7 @@ void BrowserProcessImpl::CreateLocalState() {
   // whenever the preference or its controlling policy changes.
 #if !defined(OS_CHROMEOS) && !defined(OS_ANDROID) && !defined(OS_IOS)
   pref_change_registrar_.Add(
-      prefs::kMetricsReportingEnabled,
+      metrics::prefs::kMetricsReportingEnabled,
       base::Bind(&BrowserProcessImpl::ApplyMetricsReportingPolicy,
                  base::Unretained(this)));
 #endif
diff --git a/chrome/browser/first_run/first_run_internal_posix.cc b/chrome/browser/first_run/first_run_internal_posix.cc
index 683b937..6e97dd8 100644
--- a/chrome/browser/first_run/first_run_internal_posix.cc
+++ b/chrome/browser/first_run/first_run_internal_posix.cc
@@ -38,7 +38,7 @@ void DoPostImportPlatformSpecificTasks(Profile* profile) {
   // this is POSIX-specific).
   if (GoogleUpdateSettings::GetCollectStatsConsent()) {
     g_browser_process->local_state()->SetBoolean(
-        prefs::kMetricsReportingEnabled, true);
+        metrics::prefs::kMetricsReportingEnabled, true);
   }
 #endif
 }
diff --git a/chrome/browser/metrics/chrome_metrics_service_accessor.cc b/chrome/browser/metrics/chrome_metrics_service_accessor.cc
index 50ee2fa..89741bd 100644
--- a/chrome/browser/metrics/chrome_metrics_service_accessor.cc
+++ b/chrome/browser/metrics/chrome_metrics_service_accessor.cc
@@ -42,7 +42,7 @@ bool ChromeMetricsServiceAccessor::IsMetricsAndCrashReportingEnabled() {
       prefs::kCrashReportingEnabled);
 #else
   enabled = g_browser_process->local_state()->
-      GetBoolean(prefs::kMetricsReportingEnabled);
+      GetBoolean(metrics::prefs::kMetricsReportingEnabled);
 #endif  // #if defined(OS_CHROMEOS)
 #endif  // defined(GOOGLE_CHROME_BUILD)
   return enabled;
diff --git a/chrome/browser/metrics/chrome_metrics_service_accessor_unittest.cc b/chrome/browser/metrics/chrome_metrics_service_accessor_unittest.cc
index dc70144..237539b 100644
--- a/chrome/browser/metrics/chrome_metrics_service_accessor_unittest.cc
+++ b/chrome/browser/metrics/chrome_metrics_service_accessor_unittest.cc
@@ -31,7 +31,7 @@ TEST_F(ChromeMetricsServiceAccessorTest, MetricsReportingEnabled) {
 #if defined(OS_ANDROID)
   const char* pref = prefs::kCrashReportingEnabled;
 #else
-  const char* pref = prefs::kMetricsReportingEnabled;
+  const char* pref = metrics::prefs::kMetricsReportingEnabled;
 #endif  // defined(OS_ANDROID)
   GetLocalState()->SetDefaultPrefValue(pref, new base::FundamentalValue(false));
 
diff --git a/chrome/browser/metrics/chrome_metrics_service_client.cc b/chrome/browser/metrics/chrome_metrics_service_client.cc
index e9858a6..a8cf6ef 100644
--- a/chrome/browser/metrics/chrome_metrics_service_client.cc
+++ b/chrome/browser/metrics/chrome_metrics_service_client.cc
@@ -113,7 +113,7 @@ bool IsCellularLogicEnabled() {
 bool ShouldClearSavedMetrics() {
 #if defined(OS_ANDROID)
   PrefService* local_state = g_browser_process->local_state();
-  return !local_state->HasPrefPath(prefs::kMetricsReportingEnabled) &&
+  return !local_state->HasPrefPath(metrics::prefs::kMetricsReportingEnabled) &&
          variations::GetVariationParamValue("UMA_EnableCellularLogUpload",
                                             "Enabled") == "true";
 #else
diff --git a/chrome/browser/metrics/metrics_reporting_state.cc b/chrome/browser/metrics/metrics_reporting_state.cc
index 318766b..e9d658e 100644
--- a/chrome/browser/metrics/metrics_reporting_state.cc
+++ b/chrome/browser/metrics/metrics_reporting_state.cc
@@ -60,7 +60,7 @@ void SetMetricsReporting(bool to_update_pref,
   }
 #if !defined(OS_CHROMEOS) && !defined(OS_ANDROID)
   g_browser_process->local_state()->SetBoolean(
-      prefs::kMetricsReportingEnabled, updated_pref);
+      metrics::prefs::kMetricsReportingEnabled, updated_pref);
 #endif
   // When a user opts in to the metrics reporting service, the previously
   // collected data should be cleared to ensure that nothing is reported before
@@ -103,6 +103,6 @@ void InitiateMetricsReportingChange(
 bool IsMetricsReportingUserChangable() {
   const PrefService* pref_service = g_browser_process->local_state();
   const PrefService::Preference* pref =
-      pref_service->FindPreference(prefs::kMetricsReportingEnabled);
+      pref_service->FindPreference(metrics::prefs::kMetricsReportingEnabled);
   return pref && !pref->IsManaged();
 }
diff --git a/chrome/browser/policy/configuration_policy_handler_list_factory.cc b/chrome/browser/policy/configuration_policy_handler_list_factory.cc
index 0a90e51..cbb84b6 100644
--- a/chrome/browser/policy/configuration_policy_handler_list_factory.cc
+++ b/chrome/browser/policy/configuration_policy_handler_list_factory.cc
@@ -119,7 +119,7 @@ const PolicyToPreferenceMapEntry kSimplePolicyMap[] = {
     prefs::kPrintPreviewDisabled,
     base::Value::TYPE_BOOLEAN },
   { key::kMetricsReportingEnabled,
-    prefs::kMetricsReportingEnabled,
+    metrics::prefs::kMetricsReportingEnabled,
     base::Value::TYPE_BOOLEAN },
   { key::kApplicationLocaleValue,
     prefs::kApplicationLocale,
diff --git a/chrome/browser/prefs/tracked/pref_hash_browsertest.cc b/chrome/browser/prefs/tracked/pref_hash_browsertest.cc
index d11ba30..6df10cf 100644
--- a/chrome/browser/prefs/tracked/pref_hash_browsertest.cc
+++ b/chrome/browser/prefs/tracked/pref_hash_browsertest.cc
@@ -4,6 +4,7 @@
 
 #include <string>
 
+#include "base/base_switches.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
@@ -31,7 +32,6 @@
 #include "chrome/common/pref_names.h"
 #include "chrome/test/base/testing_profile.h"
 #include "components/search_engines/default_search_manager.h"
-#include "content/public/common/content_switches.h"
 #include "extensions/browser/pref_names.h"
 #include "extensions/common/extension.h"
 
diff --git a/chrome/browser/profiles/profile_io_data.cc b/chrome/browser/profiles/profile_io_data.cc
index ffc1d5f..57ca56c 100644
--- a/chrome/browser/profiles/profile_io_data.cc
+++ b/chrome/browser/profiles/profile_io_data.cc
@@ -887,7 +887,7 @@ void ProfileIOData::InitializeMetricsEnabledStateOnUIThread() {
 #else
   // Prep the PrefMember and send it to the IO thread, since this value will be
   // read from there.
-  enable_metrics_.Init(prefs::kMetricsReportingEnabled,
+  enable_metrics_.Init(metrics::prefs::kMetricsReportingEnabled,
                        g_browser_process->local_state());
   enable_metrics_.MoveToThread(
       BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO));
diff --git a/chrome/browser/ui/cocoa/first_run_dialog.mm b/chrome/browser/ui/cocoa/first_run_dialog.mm
index f3a9503..b92fce9 100644
--- a/chrome/browser/ui/cocoa/first_run_dialog.mm
+++ b/chrome/browser/ui/cocoa/first_run_dialog.mm
@@ -87,7 +87,7 @@ bool ShowFirstRun(Profile* profile) {
   // (which is likely to be forced in enterprise deployments anyway).
   const PrefService::Preference* metrics_reporting_pref =
       g_browser_process->local_state()->FindPreference(
-          prefs::kMetricsReportingEnabled);
+          metrics::prefs::kMetricsReportingEnabled);
   if (!metrics_reporting_pref || !metrics_reporting_pref->IsManaged()) {
     base::scoped_nsobject<FirstRunDialogController> dialog(
         [[FirstRunDialogController alloc] init]);
diff --git a/chrome/browser/ui/views/first_run_dialog.cc b/chrome/browser/ui/views/first_run_dialog.cc
index 2dc7e25..4c723d5 100644
--- a/chrome/browser/ui/views/first_run_dialog.cc
+++ b/chrome/browser/ui/views/first_run_dialog.cc
@@ -51,7 +51,7 @@ bool FirstRunDialog::Show(Profile* profile) {
   // If the metrics reporting is managed, we won't ask.
   const PrefService::Preference* metrics_reporting_pref =
       g_browser_process->local_state()->FindPreference(
-          prefs::kMetricsReportingEnabled);
+          metrics::prefs::kMetricsReportingEnabled);
 
   if (!metrics_reporting_pref ||
       !metrics_reporting_pref->IsManaged()) {
diff --git a/chrome/browser/ui/views/session_crashed_bubble_view.cc b/chrome/browser/ui/views/session_crashed_bubble_view.cc
index 5d16692..c40a497 100644
--- a/chrome/browser/ui/views/session_crashed_bubble_view.cc
+++ b/chrome/browser/ui/views/session_crashed_bubble_view.cc
@@ -179,8 +179,10 @@ void SessionCrashedBubbleView::ShowForReal(
 
 #if defined(GOOGLE_CHROME_BUILD)
   if (!uma_opted_in_already) {
-    offer_uma_optin = g_browser_process->local_state()->FindPreference(
-        prefs::kMetricsReportingEnabled)->IsUserModifiable();
+    offer_uma_optin =
+        g_browser_process->local_state()
+            ->FindPreference(metrics::prefs::kMetricsReportingEnabled)
+            ->IsUserModifiable();
   }
 #endif  // defined(GOOGLE_CHROME_BUILD)
 
diff --git a/chrome/common/pref_names.cc b/chrome/common/pref_names.cc
index 544da59..80e38bd 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -1254,11 +1254,6 @@ const char kSSLVersionFallbackMin[] = "ssl.version_fallback_min";
 const char kCipherSuiteBlacklist[] = "ssl.cipher_suites.blacklist";
 const char kDisableSSLRecordSplitting[] = "ssl.ssl_record_splitting.disabled";
 
-// Boolean that specifies whether or not crash reporting and metrics reporting
-// are sent over the network for analysis.
-const char kMetricsReportingEnabled[] =
-    "user_experience_metrics.reporting_enabled";
-
 // Boolean that specifies whether or not crash reports are sent
 // over the network for analysis.
 #if defined(OS_ANDROID)
diff --git a/chrome/common/pref_names.h b/chrome/common/pref_names.h
index 2eae559..81c7566 100644
--- a/chrome/common/pref_names.h
+++ b/chrome/common/pref_names.h
@@ -431,11 +431,6 @@ extern const char kGLVendorString[];
 extern const char kGLRendererString[];
 extern const char kGLVersionString[];
 
-// For finding out whether metrics and crash reporting is enabled or not use
-// |ChromeMetricsServiceAccessor::IsMetricsAndCrashReportingEnabled()| instead
-// of reading platform specific prefs.
-extern const char kMetricsReportingEnabled[];
-
 // Android has it's own metric / crash reporting implemented in Android
 // Java code so kMetricsReportingEnabled doesn't make sense. We use this
 // to inform crashes_ui that we have enabled crash reporting.
diff --git a/chrome/installer/util/uninstall_metrics.cc b/chrome/installer/util/uninstall_metrics.cc
index fe2ee43..fbd1b90 100644
--- a/chrome/installer/util/uninstall_metrics.cc
+++ b/chrome/installer/util/uninstall_metrics.cc
@@ -51,7 +51,7 @@ bool ExtractUninstallMetrics(const base::DictionaryValue& root,
   // Make sure that the user wants us reporting metrics. If not, don't
   // add our uninstall metrics.
   bool metrics_reporting_enabled = false;
-  if (!root.GetBoolean(prefs::kMetricsReportingEnabled,
+  if (!root.GetBoolean(metrics::prefs::kMetricsReportingEnabled,
                        &metrics_reporting_enabled) ||
       !metrics_reporting_enabled) {
     return false;
diff --git a/components/metrics/metrics_pref_names.cc b/components/metrics/metrics_pref_names.cc
index 3cdebab..a5ad6a5 100644
--- a/components/metrics/metrics_pref_names.cc
+++ b/components/metrics/metrics_pref_names.cc
@@ -43,6 +43,11 @@ const char kMetricsOngoingLogs[] =
 // client id and low entropy source should be reset.
 const char kMetricsResetIds[] = "user_experience_metrics.reset_metrics_ids";
 
+// Boolean that specifies whether or not crash reporting and metrics reporting
+// are sent over the network for analysis.
+const char kMetricsReportingEnabled[] =
+    "user_experience_metrics.reporting_enabled";
+
 // Date/time when the user opted in to UMA and generated the client id for the
 // very first time (local machine time, stored as a 64-bit time_t value).
 const char kMetricsReportingEnabledTimestamp[] =
diff --git a/components/metrics/metrics_pref_names.h b/components/metrics/metrics_pref_names.h
index f4456a5..8118a59 100644
--- a/components/metrics/metrics_pref_names.h
+++ b/components/metrics/metrics_pref_names.h
@@ -17,6 +17,11 @@ extern const char kMetricsLowEntropySource[];
 extern const char kMetricsMachineId[];
 extern const char kMetricsOngoingLogs[];
 extern const char kMetricsResetIds[];
+
+// For finding out whether metrics and crash reporting is enabled use
+// ChromeMetricsServiceAccessor::IsMetricsAndCrashReportingEnabled() instead of
+// reading this pref directly.
+extern const char kMetricsReportingEnabled[];
 extern const char kMetricsReportingEnabledTimestamp[];
 extern const char kMetricsSessionID[];
 extern const char kStabilityBreakpadRegistrationSuccess[];
diff --git a/content/public/common/content_switches.cc b/content/public/common/content_switches.cc
index b8dd4b2..d186a0b 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -494,16 +494,6 @@ const char kExplicitlyAllowedPorts[]        = "explicitly-allowed-ports";
 // Load NPAPI plugins from the specified directory.
 const char kExtraPluginDir[]                = "extra-plugin-dir";
 
-// This option can be used to force field trials when testing changes locally.
-// The argument is a list of name and value pairs, separated by slashes. If a
-// trial name is prefixed with an asterisk, that trial will start activated.
-// For example, the following argument defines two trials, with the second one
-// activated: "GoogleNow/Enable/*MaterialDesignNTP/Default/"
-// This option is also used by the browser to send the list of trials to
-// renderers, using the same format. See
-// FieldTrialList::CreateTrialsFromString() in field_trial.h for details.
-const char kForceFieldTrials[]              = "force-fieldtrials";
-
 // Always use the Skia GPU backend for drawing layer tiles. Only valid with GPU
 // accelerated compositing + impl-side painting. Overrides the
 // kEnableGpuRasterization flag.
diff --git a/content/public/common/content_switches.h b/content/public/common/content_switches.h
index 5886b7c..e5b00f0 100644
--- a/content/public/common/content_switches.h
+++ b/content/public/common/content_switches.h
@@ -148,7 +148,6 @@ CONTENT_EXPORT extern const char kEnableZeroCopy[];
 CONTENT_EXPORT extern const char kExplicitlyAllowedPorts[];
 CONTENT_EXPORT extern const char kExtraPluginDir[];
 CONTENT_EXPORT extern const char kForceDisplayList2dCanvas[];
-CONTENT_EXPORT extern const char kForceFieldTrials[];
 CONTENT_EXPORT extern const char kForceGpuRasterization[];
 CONTENT_EXPORT extern const char kForceOverlayFullscreenVideo[];
 CONTENT_EXPORT extern const char kForceRendererAccessibility[];