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/capi/cef_request_context_handler_capi.h

@@ -47,7 +47,9 @@ extern "C" {
 
 
 ///
-// Implement this structure to provide handler implementations.
+// Implement this structure to provide handler implementations. The handler
+// instance will not be released until all objects related to the context have
+// been destroyed.
 ///
 typedef struct _cef_request_context_handler_t {
   ///
@@ -56,8 +58,9 @@ typedef struct _cef_request_context_handler_t {
   cef_base_t base;
 
   ///
-  // Called on the IO thread to retrieve the cookie manager. The global cookie
-  // manager will be used if this function returns NULL.
+  // Called on the IO thread to retrieve the cookie manager. If this function
+  // returns NULL the default cookie manager retrievable via
+  // cef_request_tContext::get_default_cookie_manager() will be used.
   ///
   struct _cef_cookie_manager_t* (CEF_CALLBACK *get_cookie_manager)(
       struct _cef_request_context_handler_t* self);