[autofill] Adding new API to request an interactive autocomplete UI flow.

chrome/browser/autofill/autofill_manager.h

Index: chrome/browser/autofill/autofill_manager.h
diff --git a/chrome/browser/autofill/autofill_manager.h b/chrome/browser/autofill/autofill_manager.h
index af42fbe159457bf4a809f600a0d87d5df1c0365b..9261af29144f97282f22a6ed25e09fb9507474f7 100644
--- a/chrome/browser/autofill/autofill_manager.h
+++ b/chrome/browser/autofill/autofill_manager.h
@@ -227,6 +227,9 @@ class AutofillManager : public content::WebContentsObserver,
                      const std::vector<string16>& icons,
                      const std::vector<int>& unique_ids);
 
+  // Requests an interactive autocomplete UI be shown.
+  void OnRequestAutocomplete(const FormData& form);
+
   // Fills |host| with the RenderViewHost for this tab.
   // Returns false if Autofill is disabled or if the host is unavailable.
   bool GetHost(const std::vector<AutofillProfile*>& profiles,