memory-infra: Start disentangling tracing from memory-infra

Starts refactoring the tracing specific code from MemoryDumpManager
into a new class MemoryTracingObserver. This shouldn't change the
behaviour of the MemoryDumpManager.

BUG=703184

Review-Url: https://codereview.chromium.org/2820433005
Cr-Original-Commit-Position: refs/heads/master@{#466936}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 4a4589fc42e386ba9b2ad1c153d17dd8180941f8
1 file changed
tree: 7c5f3900c245b95a18391eed998afdf3d4ea747d
  1. tools/