Move the code in ResourceFetcher handling calls from WebURLLoaderImpl to ResourceLoader

third_party/WebKit/Source/core/fetch/FetchContext.h

Index: third_party/WebKit/Source/core/fetch/FetchContext.h
diff --git a/third_party/WebKit/Source/core/fetch/FetchContext.h b/third_party/WebKit/Source/core/fetch/FetchContext.h
index 5c315156015e0469f93c9f7e3a0454e3f53952fc..8fa8d5f45908d1ea781176e9a6f5d2c2e6e9eb21 100644
--- a/third_party/WebKit/Source/core/fetch/FetchContext.h
+++ b/third_party/WebKit/Source/core/fetch/FetchContext.h
@@ -53,6 +53,13 @@ enum class WebCachePolicy;
 
 enum FetchResourceType { FetchMainResource, FetchSubresource };
 
+// The FetchContext is an interface for performing context specific processing
+// in response to events in the ResourceFetcher. The ResourceFetcher or its job
+// class, ResourceLoader, may call the methods on a FetchContext.
+//
+// Any processing that depends on core/ components outside core/fetch/ should
+// be implemented on a subclass of this interface, and then exposed to the
+// ResourceFetcher via this interface.
 class CORE_EXPORT FetchContext
     : public GarbageCollectedFinalized<FetchContext> {
   WTF_MAKE_NONCOPYABLE(FetchContext);