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By profiling mine_digger in a continuous rebuild loop, we observe Widget#syncChild as being very hot. This CL optimizes this function by making sure to read each input value exactly once. Also, the hash operations for _mountedChanged were showing up on the profile, so this CL makes _mountedChanged into a List, which should work fine. Together, these changes reduce the amount of time we spend in Navtive code inside the VM from 29% to 20%. R=ianh@google.com Review URL: https://codereview.chromium.org/1217473004.
Sky
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