https://bugs.webkit.org/show_bug.cgi?id=114703

Reviewed by Sam Weinig.

Source/WebCore:

Pass the new page to StorageNamespace::copy.

* page/Chrome.cpp:
(WebCore::Chrome::createWindow):
* storage/StorageNamespace.h:
(StorageNamespace):
* storage/StorageNamespaceImpl.cpp:
(WebCore::StorageNamespaceImpl::copy):
* storage/StorageNamespaceImpl.h:
(WebCore):
(StorageNamespaceImpl):

Source/WebKit2:

* UIProcess/Storage/StorageManager.cpp:
(WebKit::StorageManager::StorageArea::clone):
New helper function for cloning a storage area.

(WebKit::StorageManager::StorageArea::setItem):
Correctly handle the copy-on-write feature of StorageMap if it has multiple storage areas pointing to it.

(WebKit::StorageManager::StorageArea::removeItem):
Ditto.

(WebKit::StorageManager::SessionStorageNamespace::cloneTo):
Add cloned storage areas.

* WebProcess/Storage/StorageNamespaceImpl.cpp:
(WebKit::StorageNamespaceImpl::copy):
Create a new session storage namespace for the new page.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@148585 268f45cc-cd09-0410-ab3c-d52691b4dbfc