Implement the renderer side of the mojo based local storage implementation.

content/renderer/dom_storage/local_storage_area.cc

 // 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.
 
 #include "content/renderer/dom_storage/local_storage_area.h"
 
+#include "base/rand_util.h"
+#include "base/strings/string_number_conversions.h"
 #include "third_party/WebKit/public/platform/WebURL.h"
 
 using blink::WebString;
 using blink::WebURL;
 
 namespace content {
 
 LocalStorageArea::LocalStorageArea(
     scoped_refptr<LocalStorageCachedArea> cached_area)
-    : cached_area_(std::move(cached_area)) {
+    : cached_area_(std::move(cached_area)),
+      id_(base::Uint64ToString(base::RandUint64())) {
+  cached_area_->AreaCreated(this);
 }
 
 LocalStorageArea::~LocalStorageArea() {
+  cached_area_->AreaDestroyed(this);
 }
 
 unsigned LocalStorageArea::length() {
   return cached_area_->GetLength();
 }
 
 WebString LocalStorageArea::key(unsigned index) {
   return cached_area_->GetKey(index);
 }
 
 WebString LocalStorageArea::getItem(const WebString& key) {
   return cached_area_->GetItem(key);
 }
 
 void LocalStorageArea::setItem(
     const WebString& key, const WebString& value, const WebURL& page_url,
     WebStorageArea::Result& result) {
-  if (!cached_area_->SetItem(key, value, page_url))
+  if (!cached_area_->SetItem(key, value, page_url, id_))
     result = ResultBlockedByQuota;
   else
     result = ResultOK;
 }
 
 void LocalStorageArea::removeItem(
     const WebString& key, const WebURL& page_url) {
-  cached_area_->RemoveItem(key, page_url);
+  cached_area_->RemoveItem(key, page_url, id_);
 }
 
 void LocalStorageArea::clear(const WebURL& page_url) {
+  cached_area_->Clear(page_url, id_);
 }
 
 }  // namespace content