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This patch adds the flag that overrides default read buffer size
(32k Bytes) for WebSocket.
The buffer is the first pool to receive date from network socket.
This flag will be used to investigate the performance issue.

You can use this flag both on chrome and content_shell:
$ ./chrome.exe --websocket-read-buffer-size=3000000
This flag sets the buffer size 300k Bytes.

Bug: 865001
Change-Id: I57aeb9e2feb9b249f1265596d6da5524a63f801a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1635079Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Reviewed-by: Adam Rice <ricea@chromium.org>
Commit-Queue: Yoichi Osato <yoichio@chromium.org>
Cr-Commit-Position: refs/heads/master@{#665867}