LouiseHsu 7ee4615b80 Add Search Web to selection controls on iOS (flutter/engine#43324)
In native iOS, users are able to select text and initiate a web search on the selected text. Specifically, this will launch a search using the users selected default search engine. Apple provides a custom url scheme in the form of "x-web-search://?[term]" which will automatically launch a search using the user's preferred browser in Safari. Additionally, this also correctly handles the country code top level domain eg. a user with a selected region in the UK with a preferred Google search engine will automatically have the .co.uk domain appended to the end of the search.

This PR is the engine portion of the changes that will allow Search Web to be implemented
This PR addresses https://github.com/flutter/flutter/issues/82907
More details are available in this [design doc](https://github.com/flutter/engine/pull/flutter.dev/go/add-missing-features-to-selection-controls)
2023-08-02 20:43:39 +00:00
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