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Adds additional information to the WebContentsObserver
ResourceLoadComplete notification that is required by the page load
metrics code:
- host IP and port for the request
- the total bytes count
- the raw bytes count

Also passing along the RenderFrameHost as part of the callback.

Change-Id: I9646221498312800488660d6b1b76abed467031b
Reviewed-on: https://chromium-review.googlesource.com/1050927Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Jay Civelli <jcivelli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558016}