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This is a reland of d184f073
The CL was speculatively reverted for an unrelated bug (876563)

TBR=mmenke@chromium.org

Original change's description:
> Add NetLog events for cookie blocking by NetworkDelegate
>
> Cookies setting and getting can be blocked by a NetworkDelegate.
> This CL adds NetLog events so they can aid in the investigation of cookies bugs.
>
> Bug: 875849
> Change-Id: Ia2a09b443fb1ebfe8ce9dde1617920264f6f24a7
> Reviewed-on: https://chromium-review.googlesource.com/1181244
> Reviewed-by: Matt Menke <mmenke@chromium.org>
> Commit-Queue: Helen Li <xunjieli@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#584809}

Bug: 875849
Change-Id: I19e285f078599084d53c9e68a8082ef43d86e067
Reviewed-on: https://chromium-review.googlesource.com/1185102Reviewed-by: Helen Li <xunjieli@chromium.org>
Commit-Queue: Helen Li <xunjieli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585049}