Use WebIDBKeyPath type in WebKit API, implement IndexedDBKeyPath type.

content/common/indexed_db/proxy_webidbobjectstore_impl.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_COMMON_INDEXED_DB_PROXY_WEBIDBOBJECTSTORE_IMPL_H_
 #define CONTENT_COMMON_INDEXED_DB_PROXY_WEBIDBOBJECTSTORE_IMPL_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebIDBCallbacks.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebIDBObjectStore.h"
 
 namespace WebKit {
 class WebIDBCallbacks;
 class WebIDBIndex;
 class WebIDBKey;
 class WebIDBKeyRange;
 class WebString;
 }
 
 class RendererWebIDBObjectStoreImpl : public WebKit::WebIDBObjectStore {
  public:
   explicit RendererWebIDBObjectStoreImpl(int32 idb_object_store_id);
   virtual ~RendererWebIDBObjectStoreImpl();
 
   // WebKit::WebIDBObjectStore
   virtual WebKit::WebString name() const;
-  virtual WebKit::WebString keyPathString() const;
+  virtual WebKit::WebIDBKeyPath keyPath() const;
   virtual WebKit::WebDOMStringList indexNames() const;
 
   virtual void get(const WebKit::WebIDBKeyRange& key_range,
                    WebKit::WebIDBCallbacks* callbacks,
                    const WebKit::WebIDBTransaction& transaction,
                    WebKit::WebExceptionCode& ec);
   virtual void put(const WebKit::WebSerializedScriptValue& value,
                    const WebKit::WebIDBKey& key,
                    PutMode put_mode,
                    WebKit::WebIDBCallbacks* callbacks,
                    const WebKit::WebIDBTransaction& transaction,
                    WebKit::WebExceptionCode& ec);
   virtual void deleteFunction(const WebKit::WebIDBKey& key,
                               WebKit::WebIDBCallbacks* callbacks,
                               const WebKit::WebIDBTransaction& transaction,
                               WebKit::WebExceptionCode& ec);
   virtual void deleteFunction(const WebKit::WebIDBKeyRange& key_range,
                               WebKit::WebIDBCallbacks* callbacks,
                               const WebKit::WebIDBTransaction& transaction,
                               WebKit::WebExceptionCode& ec);
   virtual void clear(WebKit::WebIDBCallbacks* callbacks,
                      const WebKit::WebIDBTransaction& transaction,
                      WebKit::WebExceptionCode& ec);
 
   virtual WebKit::WebIDBIndex* createIndex(
       const WebKit::WebString& name,
-      const WebKit::WebString& key_path,
+      const WebKit::WebIDBKeyPath& key_path,
       bool unique,
       bool multi_entry,
       const WebKit::WebIDBTransaction& transaction,
       WebKit::WebExceptionCode& ec);
   // Transfers ownership of the WebIDBIndex to the caller.
   virtual WebKit::WebIDBIndex* index(const WebKit::WebString& name,
                                      WebKit::WebExceptionCode& ec);
   virtual void deleteIndex(const WebKit::WebString& name,
                            const WebKit::WebIDBTransaction& transaction,
                            WebKit::WebExceptionCode& ec);
 
   virtual void openCursor(const WebKit::WebIDBKeyRange& idb_key_range,
                   unsigned short direction,
                   WebKit::WebIDBCallbacks* callbacks,
                   const WebKit::WebIDBTransaction& transaction,
                   WebKit::WebExceptionCode& ec);
 
   virtual void count(const WebKit::WebIDBKeyRange& idb_key_range,
                      WebKit::WebIDBCallbacks* callbacks,
                      const WebKit::WebIDBTransaction& transaction,
                      WebKit::WebExceptionCode& ec);
 
  private:
   int32 idb_object_store_id_;
 };
 
 #endif  // CONTENT_COMMON_INDEXED_DB_PROXY_WEBIDBOBJECTSTORE_IMPL_H_