Cross Device Promo - Main Eligibility Flow

components/signin/core/browser/signin_metrics.h

Index: components/signin/core/browser/signin_metrics.h
diff --git a/components/signin/core/browser/signin_metrics.h b/components/signin/core/browser/signin_metrics.h
index aa043c25c3e2b3beafb071880f71282bd75ad6e3..ce1b3fce08b7e3c948dd6c1ef59cd7cd8277b778 100644
--- a/components/signin/core/browser/signin_metrics.h
+++ b/components/signin/core/browser/signin_metrics.h
@@ -126,6 +126,43 @@ enum AccountReauth {
   HISTOGRAM_REAUTH_MAX
 };
 
+// Enum values used for "Signin.XDevicePromo.Eligible" histogram, which tracks
+// the reasons for which a profile is or is not eligible for the promo.
+enum CrossDevicePromoEligibility {
+  // The user is eligible for the promo.
+  ELIGIBLE,
+  // The profile has previously opted out of the promo.
+  OPTED_OUT,
+  // The profile is already signed in.
+  SIGNED_IN,
+  // The profile does not have a single, peristent GAIA cookie.
+  NOT_SINGLE_GAIA_ACCOUNT,
+  // Yet to determine how many devices the user has.
+  UNKNOWN_COUNT_DEVICES,
+  // An error was returned trying to determine the account's devices.
+  ERROR_FETCHING_DEVICE_ACTIVITY,
+  // The call to get device activity was throttled, and never executed.
+  THROTTLED_FETCHING_DEVICE_ACTIVITY,
+  // The user has no devices.
+  ZERO_DEVICES,
+  // The user has no device that was recently active.
+  NO_ACTIVE_DEVICES,
+  // Always last enumerated type.
+  NUM_CROSS_DEVICE_PROMO_ELIGIBILITY_METRICS
+};
+
+// Enum reasons the CrossDevicePromo couldn't initialize, or that it succeeded.
+enum CrossDevicePromoInitialized {
+  // The promo was initialized successfully.
+  INITIALIZED,
+  // The profile is opted out, so the promo didn't initialize.
+  UNINITIALIZED_OPTED_OUT,
+  // Unable to read the variations configuration.
+  NO_VARIATIONS_CONFIG,
+  // Always the last enumerated type.
+  NUM_CROSS_DEVICE_PROMO_INITIALIZED_METRICS
+};
+
 // Log to UMA histograms and UserCounts stats about a single execution of the
 // AccountReconciler.
 // |total_number_accounts| - How many accounts are in the browser for this
@@ -171,6 +208,12 @@ void LogAuthError(GoogleServiceAuthError::State auth_error);
 
 void LogSigninConfirmHistogramValue(int action);
 
+void LogXDevicePromoEligible(CrossDevicePromoEligibility metric);
+
+void LogXDevicePromoInitialized(CrossDevicePromoInitialized metric);
+
+void LogBrowsingSessionDuration(const base::Time& previous_activity_time);
+
 }  // namespace signin_metrics
 
 #endif  // COMPONENTS_SIGNIN_CORE_BROWSER_SIGNIN_METRICS_H_