ash: Add AppListClient::StartZeroStateSearch() method

For productivity launcher we need to refresh the zero state search
results before we build the continue section views. Suggested files may
be deleted, and we don't want the view to disappear in the middle of
the show animation, or after the launcher is on-screen.

Add an AppListClient method to delegate back into //chrome/browser to
trigger the search. The method has a fixed 16ms timeout. For now,
always wait the full 16ms, so we can see how this feels in practice.

Bug: 1269115
Test: added to ash_unittests
Change-Id: I9fc059082a33dfe37671b2bb18c61e54b0ec61e9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3288040
Reviewed-by: Toni Barzic <tbarzic@chromium.org>
Reviewed-by: Tony Yeoman <tby@chromium.org>
Commit-Queue: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/main@{#943259}
12 files changed
tree: 6adb0b2d2dc09c5298cb716740765fdfe4fb185e
  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. .rustfmt.toml
  62. .vpython
  63. .vpython3
  64. .yapfignore
  65. AUTHORS
  66. BUILD.gn
  67. CODE_OF_CONDUCT.md
  68. codereview.settings
  69. DEPS
  70. DIR_METADATA
  71. ENG_REVIEW_OWNERS
  72. LICENSE
  73. LICENSE.chromium_os
  74. OWNERS
  75. PRESUBMIT.py
  76. PRESUBMIT_test.py
  77. PRESUBMIT_test_mocks.py
  78. README.md
  79. WATCHLISTS
README.md

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