Revert of Remove void** from disk_cache interface.

content/browser/gpu/shader_disk_cache.cc

 // Copyright (c) 2013 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.
 
 #include "content/browser/gpu/shader_disk_cache.h"
 
 #include "base/threading/thread_checker.h"
 #include "content/browser/gpu/gpu_process_host.h"
 #include "content/public/browser/browser_thread.h"
 #include "gpu/command_buffer/common/constants.h"
@@ skipping 77 matching lines @@
 
   void OnOpComplete(int rv);
 
   int OpenNextEntry();
   int OpenNextEntryComplete(int rv);
   int ReadComplete(int rv);
   int IterationComplete(int rv);
 
   base::WeakPtr<ShaderDiskCache> cache_;
   OpType op_type_;
-  scoped_ptr<disk_cache::Backend::Iterator> iter_;
+  void* iter_;
   scoped_refptr<net::IOBufferWithSize> buf_;
   int host_id_;
   disk_cache::Entry* entry_;
 
   DISALLOW_COPY_AND_ASSIGN(ShaderDiskReadHelper);
 };
 
 class ShaderClearHelper
     : public base::RefCounted<ShaderClearHelper>,
       public base::SupportsWeakPtr<ShaderClearHelper> {
@@ skipping 127 matching lines @@
   cache_->EntryComplete(this);
   op_type_ = TERMINATE;
   return rv;
 }
 
 ShaderDiskReadHelper::ShaderDiskReadHelper(
     base::WeakPtr<ShaderDiskCache> cache,
     int host_id)
     : cache_(cache),
       op_type_(OPEN_NEXT),
+      iter_(NULL),
       buf_(NULL),
       host_id_(host_id),
       entry_(NULL) {
 }
 
 void ShaderDiskReadHelper::LoadCache() {
   DCHECK(CalledOnValidThread());
   if (!cache_.get())
     return;
   OnOpComplete(net::OK);
@@ skipping 27 matching lines @@
         rv = net::ERR_FAILED;
         break;
     }
   } while (rv != net::ERR_IO_PENDING);
 }
 
 int ShaderDiskReadHelper::OpenNextEntry() {
   DCHECK(CalledOnValidThread());
   // Called through OnOpComplete, so we know |cache_| is valid.
   op_type_ = OPEN_NEXT_COMPLETE;
-  if (!iter_)
-    iter_ = cache_->backend()->CreateIterator();
-  return iter_->OpenNextEntry(
-      &entry_, base::Bind(&ShaderDiskReadHelper::OnOpComplete, this));
+  return cache_->backend()->OpenNextEntry(
+      &iter_,
+      &entry_,
+      base::Bind(&ShaderDiskReadHelper::OnOpComplete, this));
 }
 
 int ShaderDiskReadHelper::OpenNextEntryComplete(int rv) {
   DCHECK(CalledOnValidThread());
   // Called through OnOpComplete, so we know |cache_| is valid.
   if (rv == net::ERR_FAILED) {
     op_type_ = ITERATION_FINISHED;
     return net::OK;
   }
 
@@ skipping 24 matching lines @@
   entry_->Close();
   entry_ = NULL;
 
   op_type_ = OPEN_NEXT;
   return net::OK;
 }
 
 int ShaderDiskReadHelper::IterationComplete(int rv) {
   DCHECK(CalledOnValidThread());
   // Called through OnOpComplete, so we know |cache_| is valid.
-  iter_.reset();
+  cache_->backend()->EndEnumeration(&iter_);
+  iter_ = NULL;
   op_type_ = TERMINATE;
   return net::OK;
 }
 
 ShaderDiskReadHelper::~ShaderDiskReadHelper() {
   if (entry_)
     BrowserThread::PostTask(BrowserThread::IO, FROM_HERE,
                             base::Bind(&EntryCloser, entry_));
 }
 
@@ skipping 254 matching lines @@
     const net::CompletionCallback& callback) {
   if (entry_map_.empty()) {
     return net::OK;
   }
   cache_complete_callback_ = callback;
   return net::ERR_IO_PENDING;
 }
 
 }  // namespace content