Add ReadBuffersIntoConsumer and ReadBuffersIntoFile

ReadBuffers() handles two separate cases:
* Writing into a file.
* Sending data to a consumer via IPC.

Some of the internal code might be shared, but the external semantics
are different enough to justify two functions with two separate
comments.

No functional change. In particular because:
* `this` is never nullptr. ReadBuffers(..., this) always means
  ReadBuffersIntoConsumer
* weak_consumer can not be nullptr. The code checks it on the like above
  (and base::WeakPtr is not thread-safe, so it has not changed).

Bug: 195145848
Change-Id: I3336919b041ad6bcf4b0e336405812dbee8c493b
2 files changed
tree: 0ead14fae665339715950cf38da6b9e69fd5d01e
  1. .github/
  2. bazel/
  3. build_overrides/
  4. buildtools/
  5. debian/
  6. docs/
  7. examples/
  8. gn/
  9. include/
  10. infra/
  11. protos/
  12. src/
  13. test/
  14. tools/
  15. ui/
  16. .clang-format
  17. .clang-tidy
  18. .gitattributes
  19. .gitignore
  20. .gn
  21. .style.yapf
  22. Android.bp
  23. Android.bp.extras
  24. BUILD
  25. BUILD.extras
  26. BUILD.gn
  27. CHANGELOG
  28. codereview.settings
  29. DIR_METADATA
  30. heapprofd.rc
  31. LICENSE
  32. meson.build
  33. METADATA
  34. MODULE_LICENSE_APACHE2
  35. OWNERS
  36. perfetto.rc
  37. PerfettoIntegrationTests.xml
  38. PRESUBMIT.py
  39. README.chromium
  40. README.md
  41. TEST_MAPPING
  42. traced_perf.rc
  43. WORKSPACE
README.md

Perfetto - System profiling, app tracing and trace analysis

Perfetto is a production-grade open-source stack for performance instrumentation and trace analysis. It offers services and libraries and for recording system-level and app-level traces, native + java heap profiling, a library for analyzing traces using SQL and a web-based UI to visualize and explore multi-GB traces.

See https://perfetto.dev/docs or the /docs/ directory for documentation.