[sync] Expose a bookmark's parent's GUID in sync protocol (specifics)

The field is somewhat redundant to the pre-existing parent_id proto
field, which is server-defined. The new field (a GUID in specifics)
has a number of advantages:
1) Is very simple, and in particular does not require fancy dealing with
   temporary IDs during commits.
2) Is more robust agaist hash collisions and server-side proto
   serialization bugs.
3) Is better privacy-wise, since it can be encrypted (for custom
   passphrase users).
4) Unblocks better dealing with orphan nodes, which would now at least
   determine the parent's GUID, and hence such a folder can in fact be
   created (with a proper GUID) without having any further information.

That said, none of the advantages listed above will be achieved for real
anytime soon, since old data will continue to exist for a long while.
Nevertheless, let's set the foundation for a better long-term future.

Change-Id: Icfe2530a679b519e54115a378d9a67a6e7f239d2
Bug: 1143246
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3053690
Reviewed-by: Scott Violet <[email protected]>
Reviewed-by: Rushan Suleymanov <[email protected]>
Commit-Queue: Mikel Astiz <[email protected]>
Cr-Commit-Position: refs/heads/master@{#905361}
11 files changed
tree: d0ba04a1583eac6613560ce98ee6074cdf746a15
  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. codelabs/
  14. components/
  15. content/
  16. courgette/
  17. crypto/
  18. dbus/
  19. device/
  20. docs/
  21. extensions/
  22. fuchsia/
  23. gin/
  24. google_apis/
  25. google_update/
  26. gpu/
  27. headless/
  28. infra/
  29. ios/
  30. ipc/
  31. jingle/
  32. media/
  33. mojo/
  34. native_client_sdk/
  35. net/
  36. pdf/
  37. ppapi/
  38. printing/
  39. remoting/
  40. rlz/
  41. sandbox/
  42. services/
  43. skia/
  44. sql/
  45. storage/
  46. styleguide/
  47. testing/
  48. third_party/
  49. tools/
  50. ui/
  51. url/
  52. weblayer/
  53. .clang-format
  54. .clang-tidy
  55. .eslintrc.js
  56. .git-blame-ignore-revs
  57. .gitattributes
  58. .gitignore
  59. .gn
  60. .mailmap
  61. .vpython
  62. .vpython3
  63. .yapfignore
  64. AUTHORS
  65. BUILD.gn
  66. CODE_OF_CONDUCT.md
  67. codereview.settings
  68. DEPS
  69. DIR_METADATA
  70. ENG_REVIEW_OWNERS
  71. LICENSE
  72. LICENSE.chromium_os
  73. OWNERS
  74. PRESUBMIT.py
  75. PRESUBMIT_test.py
  76. PRESUBMIT_test_mocks.py
  77. README.md
  78. WATCHLISTS
README.md

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