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

Source/web/tests/WebViewTest.cpp

Index: Source/web/tests/WebViewTest.cpp
diff --git a/Source/web/tests/WebViewTest.cpp b/Source/web/tests/WebViewTest.cpp
index 17f20ee5eb6c2677056f97ff6d0531ef7e65ae74..bb56f5ef6cfd457eed2d79bbcaa07f2312a8f80d 100644
--- a/Source/web/tests/WebViewTest.cpp
+++ b/Source/web/tests/WebViewTest.cpp
@@ -1129,6 +1129,8 @@ public:
     virtual ~MockAutofillClient() { }
 
     virtual void setIgnoreTextChanges(bool ignore) OVERRIDE { m_ignoreTextChanges = ignore; }
+    // FIXME: This function is to be removed once both chromium and blink changes
+    // for BUG332557 are in.
     virtual void textFieldDidChange(const WebInputElement&) OVERRIDE
     {
         if (m_ignoreTextChanges)
@@ -1136,6 +1138,13 @@ public:
         else
             ++m_textChangesWhileNotIgnored;
     }
+    virtual void textFieldDidChange(const WebFormControlElement&) OVERRIDE
+    {
+        if (m_ignoreTextChanges)
+            ++m_textChangesWhileIgnored;
+        else
+            ++m_textChangesWhileNotIgnored;
+    }
 
     void clearChangeCounts()
     {