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This CL enables origin trial flag FetchUploadStreaming.
You can try the feature with
"Chrome --enable-features=FetchUploadStreaming" or an OT token.
Given https://github.com/whatwg/fetch/issues/966#issuecomment-608128154,
this CL also introduces the temporal AllowHTTP1ForStreamingUpload property
to measure upload streaming capability over each protocol.
API explaner: https://bit.ly/2SVvKbR

Bug: 688906
Change-Id: I46ccf37b2268371bb98af50c16b032f2d5fd470a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2174099
Commit-Queue: Yoichi Osato <yoichio@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#781762}