Detect starter pack keyword mode entry and open lens overlay for '@page'

This CL creates some event handling structure around the omnibox
controllers and clients so that '@page' keyword mode entry can be
detected and lens overlay machinery can be invoked, e.g. to select
part of the page as context. The OmniboxAction::Client is used
as the main hook to OpenLensOverlay because there's a decent chance
we may want to invoke the flow via an OmniboxAction in the future.

For now this just invokes the context menu command, and the UX is
probably heavier than we want for the omnibox. A TODO is left for
setting up the lighter weight UX where the lens overlay is prepared
in the background while the omnibox can continue receiving keystrokes.

Bug: 401583049
Change-Id: I7d78a9e576537cc6ce16cb2205649cf24fe0d4f0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6338589
Reviewed-by: Orin Jaworski <orinj@chromium.org>
Reviewed-by: Robbie Gibson <rkgibson@google.com>
Reviewed-by: Nihar Majmudar <niharm@google.com>
Commit-Queue: Orin Jaworski <orinj@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1430930}
8 files changed
tree: 9a6a1258fbb74badbbf3e5bb7c30eb611f92e016
  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. codelabs/
  13. components/
  14. content/
  15. crypto/
  16. dbus/
  17. device/
  18. docs/
  19. extensions/
  20. fuchsia_web/
  21. gin/
  22. google_apis/
  23. gpu/
  24. headless/
  25. infra/
  26. ios/
  27. ipc/
  28. media/
  29. mojo/
  30. native_client_sdk/
  31. net/
  32. pdf/
  33. ppapi/
  34. printing/
  35. remoting/
  36. rlz/
  37. sandbox/
  38. services/
  39. skia/
  40. sql/
  41. storage/
  42. styleguide/
  43. testing/
  44. third_party/
  45. tools/
  46. ui/
  47. url/
  48. webkit/
  49. .clang-format
  50. .clang-tidy
  51. .clangd
  52. .git-blame-ignore-revs
  53. .gitallowed
  54. .gitattributes
  55. .gitignore
  56. .gitmodules
  57. .gn
  58. .mailmap
  59. .rustfmt.toml
  60. .vpython3
  61. .yapfignore
  62. ATL_OWNERS
  63. AUTHORS
  64. BUILD.gn
  65. CODE_OF_CONDUCT.md
  66. codereview.settings
  67. CPPLINT.cfg
  68. CRYPTO_OWNERS
  69. DEPS
  70. DIR_METADATA
  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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