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

include/cef_request_context_handler.h

@@ -42,14 +42,17 @@
 #include "include/cef_cookie.h"
 
 ///
-// Implement this interface to provide handler implementations.
+// Implement this interface to provide handler implementations. The handler
+// instance will not be released until all objects related to the context have
+// been destroyed.
 ///
 /*--cef(source=client,no_debugct_check)--*/
 class CefRequestContextHandler : public virtual CefBase {
  public:
   ///
-  // Called on the IO thread to retrieve the cookie manager. The global cookie
-  // manager will be used if this method returns NULL.
+  // Called on the IO thread to retrieve the cookie manager. If this method
+  // returns NULL the default cookie manager retrievable via
+  // CefRequestContext::GetDefaultCookieManager() will be used.
   ///
   /*--cef()--*/
   virtual CefRefPtr<CefCookieManager> GetCookieManager() { return NULL; }