Add text field change handling for autofill preview in textarea element.

Source/core/html/HTMLTextAreaElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2010 Apple Inc. All rights reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2007 Samuel Weinig (sam@webkit.org)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 27 matching lines @@
 #include "core/editing/SpellChecker.h"
 #include "core/editing/TextIterator.h"
 #include "core/events/BeforeTextInsertedEvent.h"
 #include "core/events/Event.h"
 #include "core/events/ThreadLocalEventNames.h"
 #include "core/html/FormDataList.h"
 #include "core/html/forms/FormController.h"
 #include "core/html/shadow/ShadowElementNames.h"
 #include "core/html/shadow/TextControlInnerElements.h"
 #include "core/frame/Frame.h"
+#include "core/frame/FrameHost.h"
+#include "core/page/Chrome.h"
+#include "core/page/ChromeClient.h"
 #include "core/rendering/RenderTextControlMultiLine.h"
 #include "platform/text/PlatformLocale.h"
 #include "wtf/StdLibExtras.h"
 #include "wtf/text/StringBuilder.h"
 
 namespace WebCore {
 
 using namespace HTMLNames;
 
 static const int defaultRows = 2;
@@ skipping 212 matching lines @@
 {
     setChangedSinceLastFormControlChangeEvent(true);
     setFormControlValueMatchesRenderer(false);
     setNeedsValidityCheck();
 
     if (!focused())
         return;
 
     // When typing in a textarea, childrenChanged is not called, so we need to force the directionality check.
     calculateAndAdjustDirectionality();
+
+    ASSERT(document().isActive());
+    document().frameHost()->chrome().client().didChangeValueInTextField(*this);
 }
 
 void HTMLTextAreaElement::handleBeforeTextInsertedEvent(BeforeTextInsertedEvent* event) const
 {
     ASSERT(event);
     ASSERT(renderer());
     int signedMaxLength = maxLength();
     if (signedMaxLength < 0)
         return;
     unsigned unsignedMaxLength = static_cast<unsigned>(signedMaxLength);
@@ skipping 139 matching lines @@
 }
 
 String HTMLTextAreaElement::suggestedValue() const
 {
     return m_suggestedValue;
 }
 
 void HTMLTextAreaElement::setSuggestedValue(const String& value)
 {
     m_suggestedValue = value;
-    setInnerTextValue(m_suggestedValue);
-    updatePlaceholderVisibility(false);
     setNeedsStyleRecalc(SubtreeStyleChange);
-    setFormControlValueMatchesRenderer(true);
+    if (!value.isNull()) {
+        setInnerTextValue(m_suggestedValue);
+        updatePlaceholderVisibility(false);
+    } else {
+        setInnerTextValue(m_value);
+        updatePlaceholderVisibility(false);

[tkent, 2014/02/06 00:05:45]

nit: we can merge updatePlaceholderVisibility calls into one.

[ziran.sun, 2014/02/06 10:32:17]

Done.

+    }
 }
 
 String HTMLTextAreaElement::validationMessage() const
 {
     if (!willValidate())
         return String();
 
     if (customError())
         return customValidationMessage();
 
@@ skipping 87 matching lines @@
 {
     return true;
 }
 
 bool HTMLTextAreaElement::supportsAutofocus() const
 {
     return true;
 }
 
 }