[TabletGTS] Enter GTS instead of emptybackground when GTS enabled

Enter GTS instead of emptybackground when GTS enabled.

Currently, when there is no tab to display on tablets, the
emptybackground view is shown. When the tablet GTS is enabled, however,
we want to show the GTS in this case instead.

Video: https://drive.google.com/file/d/1ME5Z-1bO6hJBpq0U06GOJE11X4auz4qL/view?usp=sharing

(cherry picked from commit a5c3fe686b5472cfc48cfa1a52752bf2bfccca18)

Bug: 1312983, 1324978
Change-Id: I22d042650403719f7498d4acfd7a9f4f21c88ea6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3639280
Reviewed-by: Sirisha Kavuluru <skavuluru@google.com>
Reviewed-by: Theresa Sullivan <twellington@chromium.org>
Commit-Queue: Neil Coronado <nemco@google.com>
Cr-Original-Commit-Position: refs/heads/main@{#1005410}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3662124
Commit-Queue: Krishna Govind <govind@chromium.org>
Cr-Commit-Position: refs/branch-heads/5060@{#199}
Cr-Branched-From: b83393d0f4038aeaf67f970a024d8101df7348d1-refs/heads/main@{#1002911}
4 files changed
tree: dfab11bda89cfc43873f9d8856c6470ab2019418
  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. courgette/
  16. crypto/
  17. dbus/
  18. device/
  19. docs/
  20. extensions/
  21. fuchsia/
  22. fuchsia_webengine/
  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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