[Autofill] Add user type metrics.

chrome/browser/autofill/autofill_metrics.h

Index: chrome/browser/autofill/autofill_metrics.h
diff --git a/chrome/browser/autofill/autofill_metrics.h b/chrome/browser/autofill/autofill_metrics.h
index dad70555894486f6e8da0ccf3ca64524589f8427..6c0887336ba5512dd73f2c7843b77628e3489c30 100644
--- a/chrome/browser/autofill/autofill_metrics.h
+++ b/chrome/browser/autofill/autofill_metrics.h
@@ -64,6 +64,22 @@ class AutofillMetrics {
     NUM_DIALOG_SECURITY_METRICS
   };
 
+  // The initial state of user that's interacting with a freshly shown
+  // requestAutocomplete or Autocheckout dialog.
+  enum DialogInitialUserStateMetric {
+    // User not signed in, no verified Autofill profiles.
+    DIALOG_NEW_USER_NOT_SIGNED_IN = 0,
+    // User signed in, no Wallet items, no verified Autofill profiles.
+    DIALOG_NEW_USER_SIGNED_IN,
+    // User signed in, no Wallet items, has verified Autofill profiles.
+    DIALOG_AUTOFILL_USER_SIGNED_IN,
+    // User signed in, has Wallet items.
+    DIALOG_WALLET_USER_SIGNED_IN,
+    // User not signed in, has verified Autofill profiles.
+    DIALOG_AUTOFILL_USER_NOT_SIGNED_IN,
+    NUM_DIALOG_INITIAL_USER_STATE_METRICS
+  };
+
   enum InfoBarMetric {
     INFOBAR_SHOWN = 0,  // We showed an infobar, e.g. prompting to save credit
                         // card info.
@@ -247,6 +263,13 @@ class AutofillMetrics {
       autofill::DialogType dialog_type,
       DialogDismissalAction dismissal_action) const;
 
+  // This should be called as soon as the user's signed-in status and Wallet
+  // item count is known.  Records that a user starting out in |user_state| is
+  // interacting with a dialog of |dialog_type|.
+  virtual void LogDialogInitialUserState(
+      autofill::DialogType dialog_type,
+      DialogInitialUserStateMetric user_type) const;
+
   // Logs |metric| to the Wallet errors histogram for |dialog_type|.
   virtual void LogWalletErrorMetric(autofill::DialogType dialog_type,
                                     WalletErrorMetric metric) const;