Add an unimplemented history API to WebView

public/web/WebFrameClient.h

 /*
  * Copyright (C) 2011, 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 16 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef WebFrameClient_h
 #define WebFrameClient_h
 
 #include "WebDOMMessageEvent.h"
 #include "WebDataSource.h"
 #include "WebFrame.h"
+#include "WebHistoryItem.h"
 #include "WebIconURL.h"
 #include "WebNavigationPolicy.h"
 #include "WebNavigationType.h"
 #include "WebSecurityOrigin.h"
 #include "WebTextDirection.h"
 #include "public/platform/WebCommon.h"
 #include "public/platform/WebFileSystem.h"
 #include "public/platform/WebFileSystemType.h"
 #include "public/platform/WebStorageQuotaCallbacks.h"
 #include "public/platform/WebStorageQuotaType.h"
@@ skipping 110 matching lines @@
 
 
     // Navigational queries ------------------------------------------------
 
     // The client may choose to alter the navigation policy.  Otherwise,
     // defaultPolicy should just be returned.
     virtual WebNavigationPolicy decidePolicyForNavigation(
         WebLocalFrame*, WebDataSource::ExtraData*, const WebURLRequest&, WebNavigationType,
         WebNavigationPolicy defaultPolicy, bool isRedirect) { return defaultPolicy; }
 
+    // During a history navigation, we may choose to load new subframes from history as well.
+    // This returns such a history item if appropriate.
+    virtual WebHistoryItem historyItemForNewChildFrame(WebFrame*) { return WebHistoryItem(); }
+
 
     // Navigational notifications ------------------------------------------
 
     // These notifications bracket any loading that occurs in the WebFrame.
     virtual void didStartLoading(bool toDifferentDocument) { }
     virtual void didStopLoading() { }
 
     // Notification that some progress was made loading the current frame.
     // loadProgress is a value between 0 (nothing loaded) and 1.0 (frame fully
     // loaded).
@@ skipping 238 matching lines @@
     // Send initial drawing parameters to a child frame that is being rendered out of process.
     virtual void initializeChildFrame(const WebRect& frameRect, float scaleFactor) { }
 
 protected:
     ~WebFrameClient() { }
 };
 
 } // namespace blink
 
 #endif