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With this patch, the network state of elements playing inactive streams
is NETWORK_IDLE and the state of elements playing active streams is
NETWORK_LOADING.

Before this CL, the network state was always NETWORK_LOADING, which
prevented media elements from being garbage collected, which was a
source of JavaScript memory leaks and made it easy to reach limits in
the number of active low-level audio streams.

Drive-by: Fix the case of addition of stopped tracks to a stream.

Bug: 771550
Change-Id: Id0d8e27fc30c9850e5ad43d7a3887c03a9415a18
Reviewed-on: https://chromium-review.googlesource.com/1057808
Commit-Queue: Guido Urdaneta <guidou@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Emircan Uysaler <emircan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558655}