Teach webkit/support/setup_third_party.gyp about the Platform API
Teach webkit/support/setup_third_party.gyp about the Platform API

In a chromium-inside-WebKit checkout, there is no third_party/WebKit
directory but files inside chromium's webkit/ tree have absolute include
paths. This is resolved by a script that copies the header into the
output dir in the expected path.

This updates the script to know about the Platform API header locations.

BUG=none


Review URL: http://codereview.chromium.org/9147017

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@116989 0039d316-1c4b-4281-b951-d872f2087c98

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