Move the worker script loading code to the worker process (phase:1/5)

- Add contentSecurityPolicy and WebContentSecurityPolicyType to the arguments of WebSharedWorkerRepositoryClient::createSharedWorkerConnector.
- Add workerScriptLoaded(), workerScriptLoadFailed(), and selectAppChacheID() to WebSharedWorkerClient.

This is step 1 of moving the worker script loading code from the renderer process to the worker process.
See: http://crbug.com/329786

BUG=329786

Review URL: https://codereview.chromium.org/102243010

git-svn-id: svn://svn.chromium.org/blink/trunk@164576 bbb929c8-8fbe-4397-9dbb-9b2b20218538