Implement CachedMetadata handling on MojoAsyncResourceHandler

content/browser/loader/mojo_async_resource_handler.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_LOADER_MOJO_ASYNC_RESOURCE_HANDLER_H_
 #define CONTENT_BROWSER_LOADER_MOJO_ASYNC_RESOURCE_HANDLER_H_
 
 #include <stdint.h>
 
 #include <memory>
 #include <string>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/timer/timer.h"
 #include "content/browser/loader/resource_handler.h"
 #include "content/common/content_export.h"
 #include "content/common/url_loader.mojom.h"
 #include "mojo/public/cpp/bindings/associated_binding.h"
 #include "mojo/public/cpp/system/watcher.h"
 #include "net/base/io_buffer.h"
 #include "url/gurl.h"
 
 namespace net {
+class IOBufferWithSize;
 class URLRequest;
 }
 
 namespace content {
 class ResourceDispatcherHostImpl;
 struct ResourceResponse;
 
 // Used to complete an asynchronous resource request in response to resource
 // load events from the resource dispatcher host. This class is used only
 // when LoadingWithMojo runtime flag is enabled.
@@ skipping 31 matching lines @@
   void FollowRedirect() override;
 
   void OnWritableForTesting();
   static void SetAllocationSizeForTesting(size_t size);
   static constexpr size_t kDefaultAllocationSize = 512 * 1024;
 
  protected:
   // These functions can be overriden only for tests.
   virtual MojoResult BeginWrite(void** data, uint32_t* available);
   virtual MojoResult EndWrite(uint32_t written);
+  virtual net::IOBufferWithSize* GetResponseMetadata(net::URLRequest* request);
 
  private:
   class SharedWriter;
   class WriterIOBuffer;
 
   // This funcion copies data stored in |buffer_| to |shared_writer_| and
   // resets |buffer_| to a WriterIOBuffer when all bytes are copied. Returns
   // true when done successfully.
   bool CopyReadDataToDataPipe(bool* defer);
   // Allocates a WriterIOBuffer and set it to |*buf|. Returns true when done
@@ skipping 33 matching lines @@
   size_t buffer_bytes_read_ = 0;
   scoped_refptr<SharedWriter> shared_writer_;
 
   base::WeakPtrFactory<MojoAsyncResourceHandler> weak_factory_;
   DISALLOW_COPY_AND_ASSIGN(MojoAsyncResourceHandler);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_LOADER_MOJO_ASYNC_RESOURCE_HANDLER_H_