autofill: save pasted passwords on Mac

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 5b94eaebd58813de8e77b2f32fda1ef76d655216..775e0e13577938b5b8131173c5444048fb0ccb7e 100644
--- a/components/autofill/content/renderer/autofill_agent.cc
+++ b/components/autofill/content/renderer/autofill_agent.cc
@@ -394,10 +394,14 @@ void AutofillAgent::textFieldDidEndEditing(const WebInputElement& element) {
 
 void AutofillAgent::textFieldDidChange(const WebFormControlElement& element) {
   DCHECK(toWebInputElement(&element) || form_util::IsTextAreaElement(element));
+
   if (ignore_text_changes_)
     return;
 
-  if (!IsUserGesture())
+  // Disregard text changes that aren't caused by user gestures or pastes. Note
+  // that pastes aren't necessarily user gestures because Blink's conception of
+  // user gestures is centered around creating new windows/tabs.
+  if (!IsUserGesture() && !render_frame()->IsPasting())
     return;
 
   // We post a task for doing the Autofill as the caret position is not set