* Add content script injector to sandboxed renderer
* Fix 'getRenderProcessPreferences' binding to the wrong object
* Pass getRenderProcessPreferences to content-scripts-injector
* Emit document-start and document-end events in sandboxed renderer
* Use GetContext from RendererClientBase
* Prevent script context crash caused by lazily initialization
* Remove frame filtering logic for onExit callback
Since we're keeping track of which frames we've injected the bundle into, this logic is redundant.
* Add initial content script tests
* Add contextIsolation variants to content script tests
* Add set include
* Fix already loaded extension error
* Add tests for content scripts 'run_at' options
* Catch script injection eval error when CSP forbids it
This can occur in a rendered sandbox when a CSP is enabled. We'll need to switch to using isolated worlds to fix this.
* Fix content script tests not properly cleaning up extensions
* Fix lint and type errors
