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reveman authored
This improves hardware overlay support by avoiding updates to the primary plane when only overlays are damaged. The previous buffer is now reused for the primary plane when damage rect is empty. An important side-effect of this is that we can always support empty swaps without the need for partial updates. BUG=705290 CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel;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/2829543003 Cr-Commit-Position: refs/heads/master@{#466245}
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