Add support for complete isolation of storage and permissions (cache, cookies, localStorage, access grants, etc) on a per-request-context basis (issue #1044).

- CefRequestContext instances can be configured using a new CefRequestContextSettings structure passed to CefRequestContext::CreateContext.
- Scheme registration is now per-request-context using new CefRequestContext::RegisterSchemeHandlerFactory and ClearSchemeHandlerFactories methods.
- Cookie managers are now per-request-context by default and can be retrieved using a new CefRequestContext::GetDefaultCookieManager method.
- CefURLRequest::Create now accepts an optional CefRequestContext argument for associating a URL request with a context (browser process only).
- The CefRequestContextHandler associated with a CefRequestContext will not be released until all objects related to that context have been destroyed.
- When the cache path is empty an in-memory cache ("incognito mode") will be used for storage and no data will be persisted to disk.
- Add CefSettings.user_data_path which specifies the location where user data such as spell checking dictionary files will be stored on disk.
- Add asynchronous callbacks for all CefCookieManager methods.
- Add PK_LOCAL_APP_DATA and PK_USER_DATA path keys for retrieving user directories via CefGetPath.
- cefclient: Add "New Window" test that creates a new window unrelated to existing windows. When used in combination with `--request-context-per-browser` the new window will be given a new and isolated request context.

git-svn-id: https://chromiumembedded.googlecode.com/svn/trunk@2040 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

libcef/browser/browser_context_proxy.cc

@@ -17,6 +17,8 @@ CefBrowserContextProxy::CefBrowserContextProxy(
     scoped_refptr<CefBrowserContextImpl> parent)
     : handler_(handler),
       parent_(parent) {
+  DCHECK(handler_.get());
+  DCHECK(parent_.get());
 }
 
 CefBrowserContextProxy::~CefBrowserContextProxy() {
@@ -93,13 +95,25 @@ content::SSLHostStateDelegate*
   return parent_->GetSSLHostStateDelegate();
 }
 
+bool CefBrowserContextProxy::IsProxy() const {
+  return true;
+}
+
+const CefRequestContextSettings& CefBrowserContextProxy::GetSettings() const {
+  return parent_->GetSettings();
+}
+
+CefRefPtr<CefRequestContextHandler> CefBrowserContextProxy::GetHandler() const {
+  return handler_;
+}
+
 net::URLRequestContextGetter* CefBrowserContextProxy::CreateRequestContext(
     content::ProtocolHandlerMap* protocol_handlers,
     content::URLRequestInterceptorScopedVector request_interceptors) {
+  CEF_REQUIRE_UIT();
   DCHECK(!url_request_getter_.get());
   url_request_getter_ =
-      new CefURLRequestContextGetterProxy(handler_,
-          CefContentBrowserClient::Get()->request_context().get());
+      new CefURLRequestContextGetterProxy(handler_, parent_->request_context());
   resource_context()->set_url_request_context_getter(url_request_getter_.get());
   return url_request_getter_.get();
 }