lpy a0198c0f62 Reland: Create libsampler as V8 sampler library. ... This patch does five things: 1. Extracts sampler as libsampler to provide sampling functionality support. 2. Makes SampleStack virtual so embedders can override the behaviour of sample collecting. 3. Removes sampler.[h|cc]. 4. Moves sampling thread into log.cc as workaround to keep the --prof functionality. 5. Creates SamplerManager to manage the relationship between samplers and threads. The reason we port hashmap.h is that in debug mode, STL containers are using mutexes from a mutex pool, which may lead to deadlock when using asynchronously signal handler. Currently libsampler is used in V8 temporarily. BUG=v8:4789 LOG=n Committed: https://crrev.com/06cc9b7c176a6223971deaa9fbcafe1a05058c7b Cr-Commit-Position: refs/heads/master@{#36527} Review-Url: https://codereview.chromium.org/1922303002 Cr-Commit-Position: refs/heads/master@{#36532}		2016-05-26 02:14:50 +00:00
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test-sampler.cc	Reland: Create libsampler as V8 sampler library.	2016-05-26 02:14:50 +00:00