[iOS] Upstream FirstRun configuration and metrics

ios/chrome/browser/first_run/first_run_metrics.h

+// Copyright 2012 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 IOS_CHROME_BROWSER_FIRST_RUN_FIRST_RUN_METRICS_H_
+#define IOS_CHROME_BROWSER_FIRST_RUN_FIRST_RUN_METRICS_H_
+
+@protocol FirstRunMetricsDelegate
+// A callback function to whichever object is keeping track of whether
+// a user has attempted to sign in during First Run Sign-in flow.
+- (void)setSignInAttempted;
+@end
+
+namespace first_run {
+
+// The different First Run Chrome Login outcomes for users.
+enum SignInStatus {
+  // User skipped sign in by clicking on Skip at the first opportunity.
+  SIGNIN_SKIPPED_QUICK,
+  // User signed in to Chrome successfully at First Run.
+  SIGNIN_SUCCESSFUL,
+  // User attempted to sign in, but gave up by clicking on Skip after trying.
+  SIGNIN_SKIPPED_GIVEUP,
+  // SSO account exists and user skipped sign in by clicking on Skip at the
+  // first opportunity.
+  HAS_SSO_ACCOUNT_SIGNIN_SKIPPED_QUICK,
+  // SSO account exists and user signed in to Chrome successfully at First Run.
+  HAS_SSO_ACCOUNT_SIGNIN_SUCCESSFUL,
+  // SSO account exists and user attempted to sign in, but gave up by clicking
+  // on Skip after trying.
+  HAS_SSO_ACCOUNT_SIGNIN_SKIPPED_GIVEUP,
+  // Number of First Run states.
+  SIGNIN_SIZE
+};
+
+// Starting with iOS 6, Mobile Safari supports Smart App Banners which
+// can direct users into AppStore to download another app and then launches
+// the freshly installed app. This UMA histogram tracks the number of
+// Chrome application launched for the first time (First Run) as the
+// result of -openURL: call by another application. Note that there is no
+// 100%-sure way of telling if a launch is due to Smart App Banners.
+enum ExternalLaunch {
+  // Chrome was launched for the first time from Mobile Safari and there is
+  // sufficient evidence (e.g. via URL parameters) that it was the result of
+  // a Smart App Banner.
+  LAUNCH_BY_SMARTAPPBANNER,
+  // Chrome was launched for the first time from Mobile Safari, but there is
+  // not sufficient indicator to show that it was launched as a result of a
+  // click on Smart App Banner.
+  LAUNCH_BY_MOBILESAFARI,
+  // Chrome was launch for the first time by some other applications.
+  LAUNCH_BY_OTHERS,
+  // Number of ways that Chrome was launched for the first time.
+  LAUNCH_SIZE
+};
+
+}  // namespace first_run
+
+#endif  // IOS_CHROME_BROWSER_FIRST_RUN_FIRST_RUN_METRICS_H_