Set error on WebDataConsumerHandle while loading body.

content/child/shared_memory_data_consumer_handle.h

 // Copyright 2015 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_CHILD_SHARED_MEMORY_DATA_CONSUMER_HANDLE_H_
 #define CONTENT_CHILD_SHARED_MEMORY_DATA_CONSUMER_HANDLE_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/common/content_export.h"
@@ skipping 11 matching lines @@
  public:
   enum BackpressureMode {
     kApplyBackpressure,
     kDoNotApplyBackpressure,
   };
 
   class CONTENT_EXPORT Writer final {
    public:
     Writer(const scoped_refptr<Context>& context, BackpressureMode mode);
     ~Writer();
+    // Note: Writer assumes |AddData| is not called in a client's didGetReadable
+    // callback. There isn't such assumption for |Close| and |Fail|.
     void AddData(scoped_ptr<RequestPeer::ReceivedData> data);
     void Close();
+    // TODO(yhirano): Consider providing error code.
+    void Fail();
 
    private:
     scoped_refptr<Context> context_;
     BackpressureMode mode_;
 
     DISALLOW_COPY_AND_ASSIGN(Writer);
   };
 
   class ReaderImpl final : public Reader {
    public:
@@ skipping 10 matching lines @@
 
     DISALLOW_COPY_AND_ASSIGN(ReaderImpl);
  };
 
   SharedMemoryDataConsumerHandle(BackpressureMode mode,
                                  scoped_ptr<Writer>* writer);
   virtual ~SharedMemoryDataConsumerHandle();
 
   scoped_ptr<Reader> ObtainReader(Client* client);
 
-  virtual Result read(void* data, size_t size, Flags flags, size_t* readSize);
-  virtual Result beginRead(const void** buffer, Flags flags, size_t* available);
-  virtual Result endRead(size_t readSize);
-  virtual void registerClient(Client* client);
-  virtual void unregisterClient();
-
  private:
   virtual ReaderImpl* obtainReaderInternal(Client* client);
   const char* debugName() const override;
-  void LockImplicitly();
-  void UnlockImplicitly();
 
   scoped_refptr<Context> context_;
-  // This is an implicitly acquired reader for deprecated APIs.
-  scoped_ptr<Reader> reader_;
 
   DISALLOW_COPY_AND_ASSIGN(SharedMemoryDataConsumerHandle);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_SHARED_MEMORY_DATA_CONSUMER_HANDLE_H_