Basic implementation of showing password fill dialog on page load

components/password_manager/core/browser/password_manager_driver.h

Index: components/password_manager/core/browser/password_manager_driver.h
diff --git a/components/password_manager/core/browser/password_manager_driver.h b/components/password_manager/core/browser/password_manager_driver.h
index 390de2fe8fed43076f707ea4edb4318e48f0be0c..607d9ce17aad57a9c235c994a54fefd03a9b44e8 100644
--- a/components/password_manager/core/browser/password_manager_driver.h
+++ b/components/password_manager/core/browser/password_manager_driver.h
@@ -67,6 +67,11 @@ class PasswordManagerDriver
   virtual void PreviewSuggestion(const base::string16& username,
                                  const base::string16& password) = 0;
 
+  // Tells the driver to show an initial set of accounts to suggest for the
+  // form.
+  virtual void ShowInitialPasswordAccountSuggestions(

[vabr (Chromium), 2016/06/10 14:19:52]

You will need to implement this in //ios/chrome/browser/passwords as well. I
guess for the experiment you can go with a trivial implementation, but for the
potential launch we should add a real one.

[jww, 2016/06/10 23:06:54]

Maybe for now we'll just autofill on iOS and just not run the experiment?

[vabr (Chromium), 2016/06/13 08:46:41]

Yes, that's what I meant by the "trivial implementation". But to get this to
compile at all, you'll need to implement ShowInitialPasswordAccountSuggestions
at least as {} in
ios/chrome/browser/passwords/ios_chrome_password_manager_driver.*.

[jww, 2016/06/13 17:21:02]

Done.

+      const autofill::PasswordFormFillData& form_data) = 0;
+
   // Tells the driver to clear previewed password and username fields.
   virtual void ClearPreviewedForm() = 0;