[heap] Concurrency support for heap book-keeping info.
Adds concurrency support for: - MemoryChunk: Fragmentation counters - MemoryChunk: High-water mark - MemoryAllocator: Lowest and highest ever allocated addresses, size, and capacity R=hpayer@chromium.org BUG=chromium:524425 LOG=N Review URL: https://codereview.chromium.org/1340923004 Cr-Commit-Position: refs/heads/master@{#30749}
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