* src/client/components/client-web-view.vala (ClientWebView): Add
is_content_loaded property and content_loaded signal, update and fire
when getting a contentLoaded message from the WebProcess.
* ui/client-web-view.js: Fire the contentLoaded message when loading is
complete. Add ClientPageStateTest test case to ensure it is working
fine.
* test/client/components/client-web-view-test-case.vala
(ClientWebViewTestCase::load_body_fixture): Use is_content_loaded
rather than is_loading as the test for loading having finished, since
we're actually interested in when the JS has finished loaded, not the
resources.
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