Pull domstorage specifics out of RenderThreadImpl into DomStorageDispatcher

content/renderer/renderer_webstoragearea_impl.cc

-// 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/renderer/renderer_webstoragearea_impl.h"
-
-#include "base/lazy_instance.h"
-#include "base/metrics/histogram.h"
-#include "base/time.h"
-#include "base/utf_string_conversions.h"
-#include "content/common/dom_storage_messages.h"
-#include "content/renderer/render_thread_impl.h"
-#include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebURL.h"
-#include "webkit/dom_storage/dom_storage_types.h"
-
-using WebKit::WebString;
-using WebKit::WebURL;
-
-typedef IDMap<RendererWebStorageAreaImpl> AreaImplMap;
-
-static base::LazyInstance<AreaImplMap>::Leaky
-    g_all_areas_map = LAZY_INSTANCE_INITIALIZER;
-
-// static
-RendererWebStorageAreaImpl* RendererWebStorageAreaImpl::FromConnectionId(
-    int id) {
-  return g_all_areas_map.Pointer()->Lookup(id);
-}
-
-RendererWebStorageAreaImpl::RendererWebStorageAreaImpl(
-    int64 namespace_id, const WebString& origin)
-    : ALLOW_THIS_IN_INITIALIZER_LIST(
-          connection_id_(g_all_areas_map.Pointer()->Add(this))) {
-  // TODO(michaeln): fix the webkit api to have the 'origin' input
-  // be a URL instead of a string.
-  DCHECK(connection_id_);
-  RenderThreadImpl::current()->Send(
-      new DOMStorageHostMsg_OpenStorageArea(
-          connection_id_, namespace_id, GURL(origin)));
-}
-
-RendererWebStorageAreaImpl::~RendererWebStorageAreaImpl() {
-  g_all_areas_map.Pointer()->Remove(connection_id_);
-  RenderThreadImpl::current()->Send(
-      new DOMStorageHostMsg_CloseStorageArea(connection_id_));
-}
-
-// In November 2011 stats were recorded about performance of each of the
-// DOMStorage operations. Results of median, 99% quantile, and 99.9% quantile
-// are provided in milliseconds. The ratio of number of calls for each operation
-// relative to the number of calls to getItem is also provided.
-//
-// Operation    Freq     50%     99%     99.9%
-// -------------------------------------------
-// getItem      1.00     0.6     2.0     27.9
-// setItem      .029     0.7     13.6    114.9
-// removeItem   .003     0.9     11.8    90.7
-// length       .017     0.6     2.0     12.0
-// key          .591     0.6     2.0     29.9
-// clear        1e-6     1.0     32.4    605.2
-
-unsigned RendererWebStorageAreaImpl::length() {
-  unsigned length;
-  RenderThreadImpl::current()->Send(
-      new DOMStorageHostMsg_Length(connection_id_, &length));
-  return length;
-}
-
-WebString RendererWebStorageAreaImpl::key(unsigned index) {
-  NullableString16 key;
-  RenderThreadImpl::current()->Send(
-      new DOMStorageHostMsg_Key(connection_id_, index, &key));
-  return key;
-}
-
-WebString RendererWebStorageAreaImpl::getItem(const WebString& key) {
-  NullableString16 value;
-  RenderThreadImpl::current()->Send(
-      new DOMStorageHostMsg_GetItem(connection_id_, key, &value));
-  return value;
-}
-
-void RendererWebStorageAreaImpl::setItem(
-    const WebString& key, const WebString& value, const WebURL& url,
-    WebStorageArea::Result& result, WebString& old_value_webkit) {
-  if (key.length() + value.length() > dom_storage::kPerAreaQuota) {
-    result = ResultBlockedByQuota;
-    return;
-  }
-  NullableString16 old_value;
-  RenderThreadImpl::current()->Send(new DOMStorageHostMsg_SetItem(
-      connection_id_, key, value, url, &result, &old_value));
-  old_value_webkit = old_value;
-}
-
-void RendererWebStorageAreaImpl::removeItem(
-    const WebString& key, const WebURL& url, WebString& old_value_webkit) {
-  NullableString16 old_value;
-  RenderThreadImpl::current()->Send(
-      new DOMStorageHostMsg_RemoveItem(connection_id_, key, url, &old_value));
-  old_value_webkit = old_value;
-}
-
-void RendererWebStorageAreaImpl::clear(
-    const WebURL& url, bool& cleared_something) {
-  RenderThreadImpl::current()->Send(
-      new DOMStorageHostMsg_Clear(connection_id_, url, &cleared_something));
-}