Implement Blink-side changes to enable V8 code caching.

Source/core/fetch/Resource.cpp

Index: Source/core/fetch/Resource.cpp
diff --git a/Source/core/fetch/Resource.cpp b/Source/core/fetch/Resource.cpp
index 9dbab36313ef9583d14b0a72c32ab1bc17fe41ab..fa11da50fe4d391f63dabd2863af9f89ddb090ce 100644
--- a/Source/core/fetch/Resource.cpp
+++ b/Source/core/fetch/Resource.cpp
@@ -421,6 +421,11 @@ void Resource::setCachedMetadata(unsigned dataTypeID, const char* data, size_t s
     blink::Platform::current()->cacheMetadata(m_response.url(), m_response.responseTime(), serializedData.data(), serializedData.size());
 }
 
+void Resource::clearCachedMetadata()
+{
+    m_cachedMetadata.clear();

[jochen (gone - plz use gerrit), 2014/08/04 09:27:29]

have you verified that this works across reloads, or will we get both, the old
and the new meta data back from the disk cache?

[vogelheim, 2014/08/05 16:03:36]

Not yet. :) Will do before proceeding with the CL.

+}
+
 bool Resource::canDelete() const
 {
     return !hasClients() && !m_loader && !m_preloadCount && hasRightHandleCountApartFromCache(0)