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This change implements PpdProvider::ResolvePpdLicense().

Bug: chromium:888189
Test: chromeos_unittests --gtest_filter='PpdProviderTest.ResolvePpdLicense'
Change-Id: I649397270fa45b809f8039fdee7808b55621a8a2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2355008
Commit-Queue: Kalvin Lee <kdlee@chromium.org>
Reviewed-by: Luum Habtemariam <luum@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804126}