Expose resources needed by Chromium-WebView.

This is the first set of framework resources that we've encountered
during the Chromium-WebView bring up that need to be exposed, so add
them to symbols.xml. There will likely be more to come as we continue
bring up work.

Bug: 7178701
Change-Id: I12571e5385bfc13213d2e3c7dfabfdc904c8fe84