[autofill] Show autofill suggestions on tap gesture.

components/autofill/renderer/page_click_listener.h

Index: components/autofill/renderer/page_click_listener.h
diff --git a/components/autofill/renderer/page_click_listener.h b/components/autofill/renderer/page_click_listener.h
index 7101722ddb93fd472280aaf9671ae61dad1159b7..c8a31e78dcaa9e86c972f23d96464e9a108f5d4d 100644
--- a/components/autofill/renderer/page_click_listener.h
+++ b/components/autofill/renderer/page_click_listener.h
@@ -11,6 +11,11 @@ class WebInputElement;
 
 namespace autofill {
 
+enum InputEventSource {
+  TAP_GESTURE,
+  MOUSE_CLICK
+};
+
 // Interface that should be implemented by classes interested in getting
 // notifications for clicks on a page.
 // Register on the PageListenerTracker object.
@@ -19,9 +24,11 @@ class PageClickListener {
   // Notification that |element| was clicked.
   // |was_focused| is true if |element| had focus BEFORE the click.
   // |is_focused| is true if |element| has focus AFTER the click was processed.
+  // |input_event_source| is set to what the source of the interaction was.
   virtual void InputElementClicked(const WebKit::WebInputElement& element,
                                    bool was_focused,
-                                   bool is_focused) = 0;
+                                   bool is_focused,
+                                   InputEventSource input_event_source) = 0;
 
   // If the previously focused element was an input field, listeners are
   // informed that the text field has lost its focus.