Phase II Step 3: Reload LoFi/placeholder images via new ImageResource

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

 /*
     Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
     Copyright (C) 2001 Dirk Mueller <mueller@kde.org>
     Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
     Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All
     rights reserved.
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Library General Public
     License as published by the Free Software Foundation; either
@@ skipping 32 matching lines @@
 #include "wtf/HashCountedSet.h"
 #include "wtf/HashSet.h"
 #include "wtf/text/WTFString.h"
 #include <memory>
 
 namespace blink {
 
 struct FetchInitiatorInfo;
 class FetchRequest;
 class ResourceClient;
+class ResourceFetcher;
 class ResourceTimingInfo;
 class ResourceLoader;
 class SecurityOrigin;
 
 // A resource that is held in the cache. Classes who want to use this object
 // should derive from ResourceClient, to get the function calls in case the
 // requested data has arrived. This class also does the actual communication
 // with the loader to obtain the resource from the network.
 class CORE_EXPORT Resource : public GarbageCollectedFinalized<Resource>,
                              public MemoryCoordinatorClient {
@@ skipping 37 matching lines @@
     DontMarkAsReferenced,
   };
 
   virtual ~Resource();
 
   DECLARE_VIRTUAL_TRACE();
 
   virtual void setEncoding(const String&) {}
   virtual String encoding() const { return String(); }
   virtual void appendData(const char*, size_t);
-  virtual void error(const ResourceError&);
+  // LoFi images can be reloaded using |fetcherForReload| (if non-null).
+  virtual void error(const ResourceError&,
+                     ResourceFetcher* fetcherForReload = nullptr);
   virtual void setCORSFailed() {}
 
   void setNeedsSynchronousCacheHit(bool needsSynchronousCacheHit) {
     m_needsSynchronousCacheHit = needsSynchronousCacheHit;
   }
 
   void setLinkPreload(bool isLinkPreload) { m_linkPreload = isLinkPreload; }
   bool isLinkPreload() const { return m_linkPreload; }
 
   void setPreloadDiscoveryTime(double preloadDiscoveryTime) {
@@ skipping 74 matching lines @@
 
   void setLoader(ResourceLoader*);
   ResourceLoader* loader() const { return m_loader.get(); }
 
   virtual bool isImage() const { return false; }
   bool shouldBlockLoadEvent() const;
   bool isLoadEventBlockingResourceType() const;
 
   // Computes the status of an object after loading. Updates the expire date on
   // the cache entry file
-  virtual void finish(double finishTime);
+  // LoFi images can be reloaded using |fetcherForReload| (if non-null).
+  virtual void finish(double finishTime,
+                      ResourceFetcher* fetcherForReload = nullptr);
   void finish() { finish(0.0); }
 
   // FIXME: Remove the stringless variant once all the callsites' error messages
   // are updated.
   bool passesAccessControlCheck(SecurityOrigin*) const;
   bool passesAccessControlCheck(SecurityOrigin*,
                                 String& errorDescription) const;
 
   virtual PassRefPtr<const SharedBuffer> resourceBuffer() const {
     return m_data;
@@ skipping 166 matching lines @@
   // Returns the memory dump name used for tracing. See Resource::onMemoryDump.
   String getMemoryDumpName() const;
 
   const HeapHashCountedSet<WeakMember<ResourceClient>>& clients() const {
     return m_clients;
   }
   DataBufferingPolicy dataBufferingPolicy() const {
     return m_options.dataBufferingPolicy;
   }
 
-  void setCachePolicyBypassingCache();
-  void setLoFiStateOff();
-  void clearRangeRequestHeader();
-
   SharedBuffer* data() const { return m_data.get(); }
   void clearData();
 
   class ProhibitAddRemoveClientInScope : public AutoReset<bool> {
    public:
     ProhibitAddRemoveClientInScope(Resource* resource)
         : AutoReset(&resource->m_isAddRemoveClientProhibited, true) {}
   };
 
  private:
@@ skipping 87 matching lines @@
 };
 
 #define DEFINE_RESOURCE_TYPE_CASTS(typeName)                   \
   DEFINE_TYPE_CASTS(typeName##Resource, Resource, resource,    \
                     resource->getType() == Resource::typeName, \
                     resource.getType() == Resource::typeName);
 
 }  // namespace blink
 
 #endif