Re: [w3c/clipboard-apis] Add Web Custom format (PR #175)

@EdgarChen While it's true that you could write custom types with "web " prefix using DataTransfer APIs, those custom types do not follow the same model - there isn't a restriction on the number of custom format types that can be written by the web authors, no web custom JSON map for mapping the web custom types to a fixed number of native web clipboard formats etc.
We don't want to make any changes in the legacy DataTransfer APIs as it has high regression risks and the model is fairly different there(at least in Chromium). The native apps on Windows do not know how to parse Chromium specific custom types, so it's not possible for them to exchange formats between web and native apps.
Chrome doesn't expose the custom mime types exactly as is - it exposes it via a Chromium specific custom format that uses browser specific parsing types, and it is not standardized, so the native apps don't understand how to parse this structure. 

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