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mgiuca authored
The calling code has been hand-modified to, wherever possible, create vectors of StringPieces (rather than strings) for use with base::JoinString. This reduces unnecessary string copying in the calling code (sometimes updating surrounding logic to also use StringPieces). BUG=348241 CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel Review-Url: https://codereview.chromium.org/2695883003 Cr-Commit-Position: refs/heads/master@{#459983}
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