[Read Anything] Add stubbed toolbar to Read Anything side panel

This CL adds a stubbed toolbar to the Read Anything feature (previously
referred to as Reader Mode). We add a simple button and a label in
preparation for future UI work. Here is the view:

https://screenshot.googleplex.com/5mt6zcfdkTf3wEa.png

This CL is mostly structural and the view is not considered
finalized. Future CLs will implement the view once the UI
is approved.

AX-Relnotes: N/A
Bug: 1266555
Change-Id: Ie629d46764547984706f028a94105d1dc17cc502
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3527437
Reviewed-by: David Tseng <dtseng@chromium.org>
Reviewed-by: Caroline Rising <corising@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Matthew Denton <mpdenton@chromium.org>
Commit-Queue: Mark Schillaci <mschillaci@google.com>
Cr-Commit-Position: refs/heads/main@{#984566}
12 files changed
tree: 854183c2013ca72bbc473cbb199f369840c9e90e
  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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