DevTools: Load document (html) content from disk cache in page agent enabling.

Source/core/loader/FrameLoader.cpp

Index: Source/core/loader/FrameLoader.cpp
diff --git a/Source/core/loader/FrameLoader.cpp b/Source/core/loader/FrameLoader.cpp
index f5fb5b154a7023794214f4516d996c25b347ad88..09501bd5bfcb37a45c38f34f28809278349a8810 100644
--- a/Source/core/loader/FrameLoader.cpp
+++ b/Source/core/loader/FrameLoader.cpp
@@ -1041,6 +1041,14 @@ void FrameLoader::restoreScrollPositionAndViewState()
     }
 }
 
+bool FrameLoader::documentResourceRequestFromCurrentHistoryItemForInspector(ResourceRequestCachePolicy cachePolicy, ResourceRequest* request)
+{
+    if (!m_currentItem)
+        return false;
+    *request = requestFromHistoryItem(m_currentItem.get(), cachePolicy);
+    return true;
+}
+
 void FrameLoader::detachChildren()
 {
     typedef Vector<RefPtr<LocalFrame> > FrameVector;