CachedMetadata support for ServiceWorker script.

Source/core/fetch/Resource.h

Index: Source/core/fetch/Resource.h
diff --git a/Source/core/fetch/Resource.h b/Source/core/fetch/Resource.h
index 24db9ae9e8a6fde1f9911486acacebe495eaa289..8bf27cd6791602b91b610269e4969227ba28592e 100644
--- a/Source/core/fetch/Resource.h
+++ b/Source/core/fetch/Resource.h
@@ -23,6 +23,7 @@
 #ifndef Resource_h
 #define Resource_h
 
+#include "core/fetch/CachedMetadataHandler.h"
 #include "core/fetch/ResourceLoaderOptions.h"
 #include "platform/Timer.h"
 #include "platform/network/ResourceError.h"
@@ -83,11 +84,6 @@ public:
         DecodeError
     };
 
-    enum MetadataCacheType {
-        SendToPlatform, // send cache data to blink::Platform::cacheMetadata
-        CacheLocally // cache only in Resource's member variables
-    };
-
     Resource(const ResourceRequest&, Type);
 #if ENABLE(OILPAN)
     virtual ~Resource();
@@ -198,16 +194,8 @@ public:
     // Sets the serialized metadata retrieved from the platform's cache.
     virtual void setSerializedCachedMetadata(const char*, size_t);
 
-    // Caches the given metadata in association with this resource and suggests
-    // that the platform persist it. The dataTypeID is a pseudo-randomly chosen
-    // identifier that is used to distinguish data generated by the caller.
-    void setCachedMetadata(unsigned dataTypeID, const char*, size_t, MetadataCacheType = SendToPlatform);
-
-    // Reset existing metadata, to allow setting new data.
-    void clearCachedMetadata(MetadataCacheType = CacheLocally);
-
-    // Returns cached metadata of the given type associated with this resource.
-    CachedMetadata* cachedMetadata(unsigned dataTypeID) const;
+    // This may return nullptr when the resource isn't cacheable.
+    CachedMetadataHandler* cacheHandler();
 
     bool hasOneHandle() const;
     bool canDelete() const;
@@ -351,6 +339,7 @@ protected:
     Timer<Resource> m_cancelTimer;
 
 private:
+    class CacheHandler;
     bool addClientToSet(ResourceClient*);
     void cancelTimerFired(Timer<Resource>*);
 
@@ -363,9 +352,14 @@ private:
 
     void failBeforeStarting();
 
+    void setCachedMetadata(unsigned dataTypeID, const char*, size_t, CachedMetadataHandler::CacheType);
+    void clearCachedMetadata(CachedMetadataHandler::CacheType);
+    CachedMetadata* cachedMetadata(unsigned dataTypeID) const;
+
     String m_fragmentIdentifierForRequest;
 
     RefPtr<CachedMetadata> m_cachedMetadata;
+    OwnPtr<CacheHandler> m_cacheHandler;
 
     ResourceError m_error;