It is possible that we may get a call from WebCore that the first layout has

completed before we've successfully syncd the webview dimensions from Java to
native and in this case, we end up syncing a height of 0 to WebKit. This causes
hit detection to fail, as WebKit thinks we have a 0-height visible area. This
patch fixes this scenario by syncing the height of the webview back to WebKit
in the case that the first layout comes back before we've sent our dimensions.

Fix for b/2449863

Change-Id: Id72c37b17411f3409edc7104d83ca5ffd17ab09b