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Each action in the Captured Sites Automation Framework has a target
frame. The framework uses the IFrameWaiter object to acquire a handle to the RenderFrameHost of
the target frame. A target iframe can be identified by its name, its URL
or the origin of its URL.

Currently the IFrameWaiter object scans for potential targets everytime
Chrome adds a new frame. This change adds 2 additional hooks to
IFrameWaiter to scan for potential targets:

1. When a frame changes its name.
2. When a frame finishes loading a new URL.

Bug: 847905
Change-Id: Ie2b8c2f19a9f08696d474aff6af019ae116b513c
Reviewed-on: https://chromium-review.googlesource.com/c/1260510
Commit-Queue: Yiming Zhou <uwyiming@google.com>
Reviewed-by: Sebastien Seguin-Gagnon <sebsg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596888}