BackgroundTracing: Switch to Perfetto client API

This patch switches the background tracing subsystem to control tracing
through the Perfetto client API. The main benefit of this is being able
to specify priorities for tracing sessions (incl. legacy JSON ones),
which avoids interfering with interactive tracing sessions such as ones
from the DevTools profiler.

Bug: 1058632
Change-Id: I9c35e079a75a51fd4472011eee23fd431a720bec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2404830
Reviewed-by: oysteine <oysteine@chromium.org>
Reviewed-by: ssid <ssid@chromium.org>
Reviewed-by: Matthew Denton <mpdenton@chromium.org>
Auto-Submit: Sami Kyöstilä <skyostil@chromium.org>
Commit-Queue: Matthew Denton <mpdenton@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812959}
10 files changed
tree: 28238ad37cd63215822e4bc04805048292d7be34
  1. android_webview/
  2. apps/
  3. ash/
  4. base/
  5. build/
  6. build_overrides/
  7. buildtools/
  8. cc/
  9. chrome/
  10. chromecast/
  11. chromeos/
  12. cloud_print/
  13. components/
  14. content/
  15. courgette/
  16. crypto/
  17. dbus/
  18. device/
  19. docs/
  20. extensions/
  21. fuchsia/
  22. gin/
  23. google_apis/
  24. google_update/
  25. gpu/
  26. headless/
  27. infra/
  28. ios/
  29. ipc/
  30. jingle/
  31. media/
  32. mojo/
  33. native_client_sdk/
  34. net/
  35. pdf/
  36. ppapi/
  37. printing/
  38. remoting/
  39. rlz/
  40. sandbox/
  41. services/
  42. skia/
  43. sql/
  44. storage/
  45. styleguide/
  46. testing/
  47. third_party/
  48. tools/
  49. ui/
  50. url/
  51. weblayer/
  52. .clang-format
  53. .clang-tidy
  54. .eslintrc.js
  55. .git-blame-ignore-revs
  56. .gitattributes
  57. .gitignore
  58. .gn
  59. .vpython
  60. .vpython3
  61. .yapfignore
  62. AUTHORS
  63. BUILD.gn
  64. CODE_OF_CONDUCT.md
  65. codereview.settings
  66. DEPS
  67. DIR_METADATA
  68. ENG_REVIEW_OWNERS
  69. LICENSE
  70. LICENSE.chromium_os
  71. OWNERS
  72. PRESUBMIT.py
  73. PRESUBMIT_test.py
  74. PRESUBMIT_test_mocks.py
  75. README.md
  76. WATCHLISTS
README.md

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