Add API WebView.getWebViewLooper()

We want to rename WebView.getLooper() to contrast it better with the
unrelated method WebView.getHandler(). For now we just create a method
to replace WebView.getLooper(), so that we can remove references to
WebView.getLooper() before removing it.

Bug: 74831609
Test: make
Change-Id: I8e493a67aa078f9c8ceea6706dc940abacfdd6e6
2 files changed