Add iOS-specific script to gcm_internals.html
Add iOS-specific script to gcm_internals.html

This CL adds an iOS-specific script to gcm_internals.html, as has been done
in other WebUI in //components.

BUG=487000

Review URL: https://codereview.chromium.org/1475013002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#361628}

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