Add navigation controls to DevTools screencast view

Source/core/inspector/InspectorPageAgent.cpp

Index: Source/core/inspector/InspectorPageAgent.cpp
diff --git a/Source/core/inspector/InspectorPageAgent.cpp b/Source/core/inspector/InspectorPageAgent.cpp
index edbca921c420a87f3d085bca3e77313f63816e06..0d469e77a83b18c914a38a078849d5d125576e0c 100644
--- a/Source/core/inspector/InspectorPageAgent.cpp
+++ b/Source/core/inspector/InspectorPageAgent.cpp
@@ -457,6 +457,12 @@ void InspectorPageAgent::navigate(ErrorString*, const String& url)
     frame->loader()->load(request);
 }
 
+void InspectorPageAgent::getNavigationHistory(ErrorString*, int*, RefPtr<TypeBuilder::Array<TypeBuilder::Page::NavigationHistoryEntry> >&)
+{ }
+
+void InspectorPageAgent::navigateToHistoryEntry(ErrorString*, int)
+{ }
+
 static PassRefPtr<TypeBuilder::Page::Cookie> buildObjectForCookie(const Cookie& cookie)
 {
     return TypeBuilder::Page::Cookie::create()