Uses child views in Autofill Popup so we can trigger

chrome/browser/ui/autofill/autofill_popup_controller.h

Index: chrome/browser/ui/autofill/autofill_popup_controller.h
diff --git a/chrome/browser/ui/autofill/autofill_popup_controller.h b/chrome/browser/ui/autofill/autofill_popup_controller.h
index c9aec43f61bde65157c3d88dd5d74b8f0c8a022a..bae7801e95734986884aab5f114714f7ae94f7bb 100644
--- a/chrome/browser/ui/autofill/autofill_popup_controller.h
+++ b/chrome/browser/ui/autofill/autofill_popup_controller.h
@@ -10,6 +10,7 @@
 #include <vector>
 
 #include "base/compiler_specific.h"
+#include "base/optional.h"
 #include "base/strings/string16.h"
 #include "build/build_config.h"
 #include "chrome/browser/ui/autofill/autofill_popup_view_delegate.h"
@@ -24,8 +25,9 @@ struct Suggestion;
 // This interface provides data to an AutofillPopupView.
 class AutofillPopupController : public AutofillPopupViewDelegate {
  public:
-  // Recalculates the height and width of the popup and triggers a redraw.
-  virtual void UpdateBoundsAndRedrawPopup() = 0;
+  // Recalculates the height and width of the popup and triggers a redraw when
+  // suggestions change.
+  virtual void OnSuggestionsChanged() = 0;
 
   // Accepts the suggestion at |index|.
   virtual void AcceptSuggestion(size_t index) = 0;
@@ -54,7 +56,7 @@ class AutofillPopupController : public AutofillPopupViewDelegate {
 
   // Returns the index of the selected line. A line is "selected" when it is
   // hovered or has keyboard focus.
-  virtual int selected_line() const = 0;
+  virtual base::Optional<size_t> selected_line() const = 0;
 
   virtual const AutofillPopupLayoutModel& layout_model() const = 0;