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This exposes a support library feature allowing applications to set a
WebViewRendererClient object upon which renderer related callbacks are
received. Specifically, these callbacks are:

onRendererUnresponsive(renderer) - called when the renderer associated
    with a webview does not ack an input event, or a navigation does
    not commit within 5 seconds. The callback will continue to be
    called at 5 second intervals until the renderer is killed or the
    unresponsiveness resolves. |renderer| may be null if webview is
    operating in single process mode.

onRendererResponsive(renderer) - called once when an unresponsive
    renderer becomes responsive again.

Bug: 907887
Change-Id: Ic5c74160e293791e3efc051a5727448ee061c9e2
Reviewed-on: https://chromium-review.googlesource.com/c/1361242Reviewed-by: Changwan Ryu <changwan@chromium.org>
Reviewed-by: Nate Fischer <ntfschr@chromium.org>
Reviewed-by: Richard Coles <torne@chromium.org>
Commit-Queue: Tobias Sargeant <tobiasjs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#615738}