Add UMA stats for initial user policy fetch on Chrome OS.

chrome/browser/chromeos/policy/user_cloud_policy_manager_chromeos.cc

Index: chrome/browser/chromeos/policy/user_cloud_policy_manager_chromeos.cc
diff --git a/chrome/browser/chromeos/policy/user_cloud_policy_manager_chromeos.cc b/chrome/browser/chromeos/policy/user_cloud_policy_manager_chromeos.cc
index 6d51de5cfb6fef8003eb94d27980c29c335a4028..6ad2e07a9c9d7453fce94b9b588b7e78fcfd39eb 100644
--- a/chrome/browser/chromeos/policy/user_cloud_policy_manager_chromeos.cc
+++ b/chrome/browser/chromeos/policy/user_cloud_policy_manager_chromeos.cc
@@ -8,6 +8,8 @@
 #include "base/bind_helpers.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop_proxy.h"
+#include "base/metrics/histogram.h"
+#include "base/metrics/sparse_histogram.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chromeos/policy/policy_oauth2_token_fetcher.h"
 #include "chrome/browser/chromeos/policy/user_cloud_policy_manager_factory_chromeos.h"
@@ -24,6 +26,28 @@ namespace em = enterprise_management;
 
 namespace policy {
 
+namespace {
+
+// UMA histogram names.
+const char kUMADelayInitialization[] =
+    "Enterprise.UserPolicyChromeOS.DelayInitialization";
+const char kUMAInitialFetchClientError[] =
+    "Enterprise.UserPolicyChromeOS.InitialFetch.ClientError";
+const char kUMAInitialFetchDelayClientRegister[] =
+    "Enterprise.UserPolicyChromeOS.InitialFetch.DelayClientRegister";
+const char kUMAInitialFetchDelayOAuth2Token[] =
+    "Enterprise.UserPolicyChromeOS.InitialFetch.DelayOAuth2Token";
+const char kUMAInitialFetchDelayPolicyFetch[] =
+    "Enterprise.UserPolicyChromeOS.InitialFetch.DelayPolicyFetch";
+const char kUMAInitialFetchDelayTotal[] =
+    "Enterprise.UserPolicyChromeOS.InitialFetch.DelayTotal";
+const char kUMAInitialFetchOAuth2Error[] =
+    "Enterprise.UserPolicyChromeOS.InitialFetch.OAuth2Error";
+const char kUMAInitialFetchOAuth2NetworkError[] =
+    "Enterprise.UserPolicyChromeOS.InitialFetch.OAuth2NetworkError";
+
+}  // namespace
+
 UserCloudPolicyManagerChromeOS::UserCloudPolicyManagerChromeOS(
     scoped_ptr<CloudPolicyStore> store,
     scoped_ptr<ResourceCache> resource_cache,
@@ -33,6 +57,7 @@ UserCloudPolicyManagerChromeOS::UserCloudPolicyManagerChromeOS(
           store.get()),
       store_(store.Pass()),
       wait_for_policy_fetch_(wait_for_policy_fetch) {
+  time_init_started_ = base::Time::Now();
   if (resource_cache) {
     // TODO(joaodasilva): Move the backend from the FILE thread to the blocking
     // pool.
@@ -130,6 +155,11 @@ void UserCloudPolicyManagerChromeOS::OnInitializationCompleted(
     CloudPolicyService* cloud_policy_service) {
   DCHECK_EQ(service(), cloud_policy_service);
   cloud_policy_service->RemoveObserver(this);
+
+  time_init_completed_ = base::Time::Now();
+  UMA_HISTOGRAM_TIMES(kUMADelayInitialization,
+                      time_init_completed_ - time_init_started_);
+
   // If the CloudPolicyClient isn't registered at this stage then it needs an
   // OAuth token for the initial registration.
   //
@@ -171,7 +201,14 @@ void UserCloudPolicyManagerChromeOS::OnPolicyFetched(
 void UserCloudPolicyManagerChromeOS::OnRegistrationStateChanged(
     CloudPolicyClient* cloud_policy_client) {
   DCHECK_EQ(client(), cloud_policy_client);
+
   if (wait_for_policy_fetch_) {
+    time_client_registered_ = base::Time::Now();
+    if (!time_token_available_.is_null()) {
+      UMA_HISTOGRAM_TIMES(kUMAInitialFetchDelayClientRegister,
+                          time_client_registered_ - time_token_available_);
+    }
+
     // If we're blocked on the policy fetch, now is a good time to issue it.
     if (client()->is_registered()) {
       service()->RefreshPolicy(
@@ -190,6 +227,11 @@ void UserCloudPolicyManagerChromeOS::OnClientError(
     CloudPolicyClient* cloud_policy_client) {
   DCHECK_EQ(client(), cloud_policy_client);
   CancelWaitForPolicyFetch();
+
+  if (wait_for_policy_fetch_) {
+    UMA_HISTOGRAM_SPARSE_SLOWLY(kUMAInitialFetchClientError,
+                                cloud_policy_client->status());
+  }
 }
 
 void UserCloudPolicyManagerChromeOS::OnComponentCloudPolicyRefreshNeeded() {
@@ -225,6 +267,13 @@ void UserCloudPolicyManagerChromeOS::OnOAuth2PolicyTokenFetched(
     const std::string& policy_token,
     const GoogleServiceAuthError& error) {
   DCHECK(!client()->is_registered());
+
+  time_token_available_ = base::Time::Now();
+  if (wait_for_policy_fetch_) {
+    UMA_HISTOGRAM_TIMES(kUMAInitialFetchDelayOAuth2Token,
+                        time_token_available_ - time_init_completed_);
+  }
+
   if (error.state() == GoogleServiceAuthError::NONE) {
     // Start client registration. Either OnRegistrationStateChanged() or
     // OnClientError() will be called back.
@@ -233,6 +282,14 @@ void UserCloudPolicyManagerChromeOS::OnOAuth2PolicyTokenFetched(
   } else {
     // Failed to get a token, stop waiting and use an empty policy.
     CancelWaitForPolicyFetch();
+
+    UMA_HISTOGRAM_ENUMERATION(kUMAInitialFetchOAuth2Error,
+                              error.state(),
+                              GoogleServiceAuthError::NUM_STATES);
+    if (error.state() == GoogleServiceAuthError::CONNECTION_FAILED) {
+      UMA_HISTOGRAM_SPARSE_SLOWLY(kUMAInitialFetchOAuth2NetworkError,
+                                  error.network_error());
+    }
   }
 
   token_fetcher_.reset();
@@ -240,6 +297,11 @@ void UserCloudPolicyManagerChromeOS::OnOAuth2PolicyTokenFetched(
 
 void UserCloudPolicyManagerChromeOS::OnInitialPolicyFetchComplete(
     bool success) {
+
+  const base::Time now = base::Time::Now();
+  UMA_HISTOGRAM_TIMES(kUMAInitialFetchDelayPolicyFetch,
+                      now - time_client_registered_);
+  UMA_HISTOGRAM_TIMES(kUMAInitialFetchDelayTotal, now - time_init_started_);
   CancelWaitForPolicyFetch();
 }