INPUT/TEXTAREA elements: Dispatch 'change' event even if a user-edit value is overwritten by JS

third_party/WebKit/Source/core/html/HTMLTextAreaElement.cpp

Index: third_party/WebKit/Source/core/html/HTMLTextAreaElement.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLTextAreaElement.cpp b/third_party/WebKit/Source/core/html/HTMLTextAreaElement.cpp
index d38b101b4d987be76e551cae86b8f2c9a5c3a397..457301e7681c4518fc909053adc925568228c312 100644
--- a/third_party/WebKit/Source/core/html/HTMLTextAreaElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLTextAreaElement.cpp
@@ -435,12 +435,23 @@ void HTMLTextAreaElement::setValueCommon(const String& newValue,
   }
 
   notifyFormStateChanged();
-  if (eventBehavior == DispatchNoEvent) {
-    setTextAsOfLastFormControlChangeEvent(normalizedValue);
-  } else {
-    if (eventBehavior == DispatchInputAndChangeEvent)
+  switch (eventBehavior) {
+    case DispatchChangeEvent:
+      dispatchFormControlChangeEvent();
+      break;
+
+    case DispatchInputAndChangeEvent:
       dispatchFormControlInputEvent();
-    dispatchFormControlChangeEvent();
+      dispatchFormControlChangeEvent();
+      break;
+
+    case DispatchNoEvent:
+      // We need to update textAsOfLastFormControlChangeEvent for |value| IDL
+      // setter without focus because input-assist features use setValue("...",
+      // DispatchChangeEvent) without setting focus.
+      if (!isFocused())
+        setTextAsOfLastFormControlChangeEvent(normalizedValue);
+      break;
   }
 }