Add more params to WebViewClient.shouldInterceptRequest.

This changes shouldInterceptRequest to take an object containing the
following new parameters: isMainFrame, hasUserGesture, method, headers.
This also lets the embedder specify the following additional properties
of the response: status code, response phrase, headers.

BUG: 7589347
Change-Id: Id922c5e7023eb067db871e6f782f599492a2428f
4 files changed