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diff --git a/content/browser/storage_partition_impl_map.cc b/content/browser/storage_partition_impl_map.cc
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+++ b/content/browser/storage_partition_impl_map.cc
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+// Copyright (c) 2012 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/storage_partition_impl_map.h"
+
+#include "base/bind.h"
+#include "base/callback.h"
+#include "base/file_path.h"
+#include "base/stl_util.h"
+#include "base/string_util.h"
+#include "content/browser/appcache/chrome_appcache_service.h"
+#include "content/browser/resource_context_impl.h"
+#include "content/browser/storage_partition_impl.h"
+#include "content/public/browser/browser_context.h"
+#include "content/public/browser/browser_thread.h"
+#include "content/public/common/content_constants.h"
+
+namespace content {
+
+// Dirname for storing persistent data for renderers with isolated storage.
+const FilePath::CharType kStoragePartitionDirName[] =
+    FILE_PATH_LITERAL("Storage Partitions");
+
+StoragePartitionImplMap::StoragePartitionImplMap(
+    BrowserContext* browser_context)
+    : browser_context_(browser_context) {
+}
+
+StoragePartitionImplMap::~StoragePartitionImplMap() {
+  STLDeleteContainerPairSecondPointers(partitions_.begin(),
+                                       partitions_.end());
+}
+
+StoragePartitionImpl* StoragePartitionImplMap::Get(
+    const std::string& partition_id) {
+  // Find the previously created partition if it's available.
+  std::map<std::string, StoragePartitionImpl*>::const_iterator it =
+      partitions_.find(partition_id);
+  if (it != partitions_.end())
+    return it->second;
+
+  // There was no previous partition, so let's make a new one.
+  FilePath partition_path = browser_context_->GetPath();
+  if (!partition_id.empty()) {
+    // TODO(ajwong): This should check the path is valid?
+    CHECK(IsStringASCII(partition_id));
+    partition_path = partition_path.Append(kStoragePartitionDirName)
+        .AppendASCII(partition_id);
+  }
+
+  StoragePartitionImpl* storage_partition =
+      StoragePartitionImpl::Create(browser_context_, partition_path);
+  partitions_[partition_id] = storage_partition;
+
+  PostCreateInitialization(storage_partition, partition_path);
+
+  // TODO(ajwong): We need to remove this conditional by making
+  // InitializeResourceContext() understand having different partition data
+  // based on the renderer_id.
+  if (partition_id.empty()) {
+    InitializeResourceContext(browser_context_);
+  }
+
+  return storage_partition;
+}
+
+void StoragePartitionImplMap::ForEach(
+    const BrowserContext::StoragePartitionCallback& callback) {
+  for (std::map<std::string, StoragePartitionImpl*>::const_iterator it =
+           partitions_.begin();
+       it != partitions_.end();
+       ++it) {
+    callback.Run(it->first, it->second);
+  }
+}
+
+void StoragePartitionImplMap::PostCreateInitialization(
+    StoragePartitionImpl* partition,
+    const FilePath& partition_path) {
+  // Check first to avoid memory leak in unittests.
+  if (BrowserThread::IsMessageLoopValid(BrowserThread::IO)) {
+    BrowserThread::PostTask(
+        BrowserThread::IO, FROM_HERE,
+        base::Bind(&ChromeAppCacheService::InitializeOnIOThread,
+                   partition->GetAppCacheService(),
+                   browser_context_->IsOffTheRecord() ? FilePath() :
+                       partition_path.Append(kAppCacheDirname),
+                       browser_context_->GetResourceContext(),
+                   make_scoped_refptr(
+                       browser_context_->GetSpecialStoragePolicy())));
+  }
+}
+
+}  // namespace content