[password autofill] Add stats on provisional save failures.

chrome/browser/password_manager/password_manager.h

Index: chrome/browser/password_manager/password_manager.h
diff --git a/chrome/browser/password_manager/password_manager.h b/chrome/browser/password_manager/password_manager.h
index d65d1c7d449d5c2d7ca9280649eca73ad3e28a67..7167efda6a159b75499287a00bddd220af9c9e28 100644
--- a/chrome/browser/password_manager/password_manager.h
+++ b/chrome/browser/password_manager/password_manager.h
@@ -89,6 +89,20 @@ class PasswordManager : public LoginModel,
  private:
   friend class content::WebContentsUserData<PasswordManager>;
 
+  enum ProvisionalSaveFailure {
+    SAVING_DISABLED,
+    EMPTY_PASSWORD,
+    NO_MATCHING_FORM,
+    MATCHING_NOT_COMPLETE,
+    FORM_BLACKLISTED,
+    INVALID_FORM,
+    AUTOCOMPLETE_OFF,
+    MAX_FAILURE_VALUE
+  };
+
+  // Log failure for UMA
+  void RecordFailure(ProvisionalSaveFailure failure);
+
   // Possibly set up FieldTrial for testing other possible usernames. This only
   // happens if there are other_possible_usernames to be shown and the
   // experiment hasn't already been initialized. We setup the experiment at