[side search] Add a side search page action entrypoint

This CL enables Side Search for all desktop platforms aliased by the
toolkit_views buildflag.

This also adds an entrypoint for side search to the omnibox as a page
action icon view. This entrypoint is gated behind the default-disabled
kSideSearchDSESupport flag.

This entrypoint will be visible in the omnibox when the side panel
can be shown (i.e. there is SRP to host in the side panel) and only
when the side panel is closed.

Clicking the page action icon will cause the side panel to open and
the entrypoint to disappear. See mocks below for details.

https://www.figma.com/file/7kHsKCbegnvkE4qgFOUUpT/MWB-Side-Search?node-id=2121%3A32604

Follow up CLs will move the side search side panel to the RHS when
the kSideSearchDSESupport flag is enabled and ensure the RHS side
panel button is toggled while open.

Bug: 1300897
Change-Id: I45f5f665b28ad47c641ac14ae63c3840797ac3e2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3508639
Reviewed-by: Dana Fried <dfried@chromium.org>
Reviewed-by: Roman Arora <romanarora@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Commit-Queue: Thomas Lukaszewicz <tluk@chromium.org>
Cr-Commit-Position: refs/heads/main@{#979880}
10 files changed
tree: 2ece62cbafd6459c8323dc2b43ba9533ec8bb7f0
  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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