Reland "Do not return clipboard history or paste items when screen is locked"

This is a reland of commit 5b6328e6a2d64fcac8afb4fc68e33bd8847af1a6

The original CL failed ASAN because I was making a pointer to a
temporary value. Additionally, the LockedScreen tests would have been
flaky due to lack of synchronization as originally submitted. See the
diff from patchset 1 to patchset 4 for the fixes.

Original change's description:
> Do not return clipboard history or paste items when screen is locked
>
> In ClipboardHistoryControllerImpl, make sure the screen is not locked
> when surfacing clipboard history data. In each case, check right before
> returning the data (after asynchronous tasks have finished).
>
> Fixed: 1306951
> Change-Id: I2af0ff6cc676354fd3590cf5f1dd136dbdacb2cf
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3517909
> Reviewed-by: James Cook <jamescook@chromium.org>
> Reviewed-by: David Black <dmblack@google.com>
> Commit-Queue: Colin Kincaid <ckincaid@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#981882}

Fixed: 1306951
Change-Id: Ib73b9bc7a6bdc07fb6f23875e2e814379674c21f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3533043
Reviewed-by: David Black <dmblack@google.com>
Reviewed-by: James Cook <jamescook@chromium.org>
Commit-Queue: Colin Kincaid <ckincaid@chromium.org>
Cr-Commit-Position: refs/heads/main@{#984597}
5 files changed
tree: 2dee1ac923b2f6e43b112e44d52dfb1e9dc0ba8c
  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. 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. .mailmap
  60. .rustfmt.toml
  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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