Add D-Bus interface for handling memory pressure

This interface exports the function provided by the chromeos memory
pressure module in //chromeos/memory/pressure/. This interface will be
used by chrome, CrOS VM and ARCVM to query system memory pressure
status. The clients of this interface shall try to release memory when
the memory pressure is high.

BUG=b:149833548
Test: dbus-send --system --type=method_call --print-reply \
    --dest=org.chromium.MemoryPressure /org/chromium/MemoryPressure \
    org.chromium.MemoryPressure.GetAvailableMemoryKB

Change-Id: I795b688433ef8c5ab58a7d2099f369655f7b41c8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2409423
Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Brian Geffon <bgeffon@chromium.org>
Commit-Queue: Kuo-Hsin Yang <vovoy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807548}
7 files changed
tree: cd3733173c14558a6c437a8173e8cd6f3eea229f
  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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