Introduce reauthenticateUserWithID:email:callback:

This new ChromeIdentityInteractionManager reauthenticate method is more
flexible and allow the implementation to do some internal cleanup based
on a unique identifier (the email can change).

BUG=623928

Review-Url: https://codereview.chromium.org/2110183006
Cr-Commit-Position: refs/heads/master@{#403206}

ios/public/provider/chrome/browser/signin/chrome_identity_interaction_manager.h

@@ -45,6 +45,18 @@ typedef void (^SigninCompletionCallback)(ChromeIdentity* identity,
 // * |completion| will be called once the operation has finished.
 - (void)addAccountWithCompletion:(SigninCompletionCallback)completion;
 
+// Starts the reauthentication operation for a user. Presents user with the
+// screen to enter credentials with the email pre-entered.
+// Note: Calling this method will fail and the completion will be called with a
+// CHROME_IDENTITY_OPERATION_ONGOING error if there is already another add
+// account or reauthenticate operation ongoing.
+// * |userID| is the unique identifier of the user.
+// * |userEmail| will be pre-entered on the presented screen.
+// * |completion| will be called once the operation has finished.
+- (void)reauthenticateUserWithID:(NSString*)userID
+                           email:(NSString*)userEmail
+                      completion:(SigninCompletionCallback)completion;
+
 // Starts the reauthentication operation for a user. Presents user with the
 // screen to enter credentials with the email pre-entered.
 // Note: Calling this method will fail and the completion will be called with a

ios/public/provider/chrome/browser/signin/chrome_identity_interaction_manager.mm

@@ -31,6 +31,13 @@
   completion(nil, nil);
 }
 
+- (void)reauthenticateUserWithID:(NSString*)userID
+                           email:(NSString*)userEmail
+                      completion:(SigninCompletionCallback)completion {
+  NOTREACHED() << "Subclasses must override this";
+  completion(nil, nil);
+}
+
 - (void)reauthenticateUserWithEmail:(NSString*)email
                          completion:(SigninCompletionCallback)completion {
   NOTREACHED() << "Subclasses must override this";