MemoryCache: Enable MemoryCache to have multiple isolated resource maps

Source/core/testing/Internals.cpp

Index: Source/core/testing/Internals.cpp
diff --git a/Source/core/testing/Internals.cpp b/Source/core/testing/Internals.cpp
index b98434a4f89d5d3944e552b9fe5c4b9236ed41e7..c383ff4a2c5a1d810d068f201e394ff0bde2cb4d 100644
--- a/Source/core/testing/Internals.cpp
+++ b/Source/core/testing/Internals.cpp
@@ -354,7 +354,10 @@ bool Internals::isLoadingFromMemoryCache(const String& url)
 {
     if (!contextDocument())
         return false;
-    Resource* resource = memoryCache()->resourceForURL(contextDocument()->completeURL(url));
+    // FIXME: There is no way to get the right cache key here. This function is
+    // only used for testing, so the default identifier should be ok for now.

[Mike West, 2014/10/24 12:43:00]

Doesn't this mean you're not going to get the correct test results when running
this for resources loaded via SW? How do you intend to test this otherwise?

[nhiroki, 2014/10/27 14:30:13]

I found the way to get the key here, so removed this comment.

+    const String cacheIdentifier = MemoryCache::defaultCacheIdentifier();
+    Resource* resource = memoryCache()->resourceForURL(cacheIdentifier, contextDocument()->completeURL(url));
     return resource && resource->status() == Resource::Cached;
 }