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Adding a cors-and-webview-api.md to give WebView and chromium
developers detailed knowledge to keep the compatible CORS and
Origin related behaviors.

Bug: 1035366
Change-Id: Ia7695011ef4b04d528af523cd2a4a0a4503eff2e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2024652
Commit-Queue: Takashi Toyoshima <toyoshim@chromium.org>
Auto-Submit: Takashi Toyoshima <toyoshim@chromium.org>
Reviewed-by: Nate Fischer <ntfschr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#736291}