1.13 stable builds of the SDK contain a version of server that fails catastrophically when analyzing source that imports packages that define embedded libraries. Since we can't pragmatically require more recent SDKs for flutter development we have been prevented from landing embedded libs in the flutter engine. By renaming the key we use to identify contributed libraries, this change avoids the issue. Old versions of server will simply ignore the new key and new ones will process it properly. Win-win!
BUG=
R=danrubel@google.com
Review URL: https://codereview.chromium.org/1643023002 .
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