Allow only a user gesture to trigger autofill popup

components/autofill/content/renderer/autofill_agent.cc

Index: components/autofill/content/renderer/autofill_agent.cc
diff --git a/components/autofill/content/renderer/autofill_agent.cc b/components/autofill/content/renderer/autofill_agent.cc
index ee1ddd2970ef00e42208fa5675e9996f44bf9398..3c8c7c3ce1041a0c68070073c2be699c86c30c5d 100644
--- a/components/autofill/content/renderer/autofill_agent.cc
+++ b/components/autofill/content/renderer/autofill_agent.cc
@@ -43,6 +43,7 @@
 #include "third_party/WebKit/public/web/WebNode.h"
 #include "third_party/WebKit/public/web/WebOptionElement.h"
 #include "third_party/WebKit/public/web/WebTextAreaElement.h"
+#include "third_party/WebKit/public/web/WebUserGestureIndicator.h"
 #include "third_party/WebKit/public/web/WebView.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/events/keycodes/keyboard_codes.h"
@@ -62,6 +63,7 @@ using blink::WebNode;
 using blink::WebOptionElement;
 using blink::WebString;
 using blink::WebTextAreaElement;
+using blink::WebUserGestureIndicator;
 using blink::WebVector;
 
 namespace autofill {
@@ -154,6 +156,7 @@ AutofillAgent::AutofillAgent(content::RenderFrame* render_frame,
       did_set_node_text_(false),
       ignore_text_changes_(false),
       is_popup_possibly_visible_(false),
+      disable_user_gesture_check_(false),
       weak_ptr_factory_(this) {
   render_frame->GetWebFrame()->setAutofillClient(this);
 
@@ -385,6 +388,11 @@ void AutofillAgent::textFieldDidChange(const WebFormControlElement& element) {
   if (ignore_text_changes_)
     return;
 
+  if (!WebUserGestureIndicator::isProcessingUserGesture() &&
+      !disable_user_gesture_check_) {
+    return;
+  }
+
   DCHECK(toWebInputElement(&element) || IsTextAreaElement(element));
 
   if (did_set_node_text_) {