Implement URLSearchParams.

Source/core/dom/DOMURLUtils.h

Index: Source/core/dom/DOMURLUtils.h
diff --git a/Source/core/dom/DOMURLUtils.h b/Source/core/dom/DOMURLUtils.h
index 1987ecd72054e349d44a522bd9b4a50143f0e906..55abfc5f55a2e9573b7aa2778f162df111fc5857 100644
--- a/Source/core/dom/DOMURLUtils.h
+++ b/Source/core/dom/DOMURLUtils.h
@@ -27,12 +27,15 @@
 #ifndef DOMURLUtils_h
 #define DOMURLUtils_h
 
+#include "core/dom/DOMURLSearchParams.h"
 #include "core/dom/DOMURLUtilsReadOnly.h"
 #include "wtf/Forward.h"
+#include "wtf/OwnPtr.h"
 #include "wtf/text/WTFString.h"
 
 namespace WebCore {
 
+class ExceptionState;
 class KURL;
 
 class DOMURLUtils : public DOMURLUtilsReadOnly {
@@ -52,6 +55,38 @@ public:
     static void setPathname(DOMURLUtils*, const String&);
     static void setSearch(DOMURLUtils*, const String&);
     static void setHash(DOMURLUtils*, const String&);
+
+    static DOMURLSearchParams* searchParams(DOMURLUtils*);
+    static void setSearchParams(DOMURLUtils*, DOMURLSearchParams*, ExceptionState&);
+
+    static void update(DOMURLUtils*);
+
+    // To correctly record object dependencies during GCs, we have to
+    // map from a URLSearchParams' url object (a DOMURLUtils pointer)
+    // to its corresponding wrapper object - the wrapper object for
+    // the concrete type implementing the URLUtils interface.
+    //
+    // Indirectly (and pragmatically) express such type discovery via
+    // an enum. If the URLUtils interface is implemented by another
+    // object, and it doesn't fit with one of the below, the type will
+    // have to be extended. (Along with the custom wrapper function
+    // that considers its value.)
+    enum ImplementedBy {
+        Anchor, // derives from HTMLAnchorElement
+        DomURL
+    };
+
+    virtual ImplementedBy implementedBy() const = 0;
+
+protected:
+    static void createSearchParams(DOMURLUtils*, const String&);
+    static void updateSearchParams(DOMURLUtils*, const String&);
+
+    friend class DOMURLSearchParams;
+    virtual void refURLUtils() = 0;
+    virtual void derefURLUtils() = 0;
+
+    OwnPtr<DOMURLSearchParams> m_searchParams;
 };
 
 } // namespace WebCore