Implement URLSearchParams.

Source/core/dom/DOMURL.cpp

Index: Source/core/dom/DOMURL.cpp
diff --git a/Source/core/dom/DOMURL.cpp b/Source/core/dom/DOMURL.cpp
index 576a46fc6e1cff84fd191b5c9e4fabd8c8a68096..4c596475596e7c464a62ae1af54199ea1e519045 100644
--- a/Source/core/dom/DOMURL.cpp
+++ b/Source/core/dom/DOMURL.cpp
@@ -43,12 +43,17 @@ namespace blink {
 DOMURL::DOMURL(const String& url, const KURL& base, ExceptionState& exceptionState)
 {
     ScriptWrappable::init(this);
-    if (!base.isValid())
+    if (!base.isValid()) {
         exceptionState.throwDOMException(SyntaxError, "Invalid base URL");
+        return;
+    }
 
     m_url = KURL(base, url);
-    if (!m_url.isValid())
+    if (!m_url.isValid()) {
         exceptionState.throwDOMException(SyntaxError, "Invalid URL");
+        return;
+    }
+    DOMURLUtils::update();
 }
 
 void DOMURL::setInput(const String& value)
@@ -61,6 +66,7 @@ void DOMURL::setInput(const String& value)
         m_url = KURL();
         m_input = value;
     }
+    DOMURLUtils::update();
 }
 
 String DOMURL::createObjectURL(ExecutionContext* executionContext, Blob* blob, ExceptionState& exceptionState)
@@ -103,4 +109,9 @@ void DOMURL::revokeObjectUUID(ExecutionContext* executionContext, const String&
     executionContext->publicURLManager().revoke(uuid);
 }
 
+void DOMURL::trace(Visitor* visitor)
+{
+    DOMURLUtils::trace(visitor);
+}
+
 } // namespace blink