Explicitly listing all third-part licensed files

[wasphin]

What problem does this PR solve?

Issue Number: NONE

See discussion here at https://lists.apache.org/thread/djrc95ocho6nxvl8t1kzorddl653ttp7

Problem Summary:

What is changed and the side effects?

Changed:
Update LICENSE to list files porting from Chromium.

Side effects:

• Performance effects(性能影响): N/A

• Breaking backward compatibility(向后兼容性): N/A

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Check List:

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