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DownloadManager today has some minimal support to upload a byte array.
We are extending it to upload blobs in this CL. The client will embed
the blob data inside the post body (ResourceRequestBody) of the
DownloadUrlParameters which will be subsequently passed to the
URLRequest/ResourceRequest.

Bug: 812327
Change-Id: Ia230961294d3bdbcf6284fde0e078c5844a991bf
Reviewed-on: https://chromium-review.googlesource.com/919622Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Min Qin <qinmin@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Commit-Queue: Shakti Sahu <shaktisahu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537225}