Fixed crash when adding all bookmarks to new group

The browser would crash when activating the "Open all in new tab group"
menu item while on an empty Bookmarks bar (or empty folder). This change
does 3 things:
1. Add a simple DCHECK in TabStripModel::AddToNewGroup to verify that
   the indices parameter isn't empty.
2. Gray out the "Open all in new tab group" option if there are no
   bookmarks.
3. Add a DCHECK if the user somehow selects "Open all in new tab group"
   and there are no bookmarks, just in case the option were to ever show
   up as enabled when it shouldn't.

Bug: 1240694
Change-Id: I4eb8bd47e7b4aa1f9335282d8cd6210946361d17
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3100552
Reviewed-by: Dana Fried <dfried@chromium.org>
Reviewed-by: Charlene Yan <cyan@chromium.org>
Commit-Queue: Federico Paredes <fedpar@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#912845}
2 files changed
tree: df0199ab8ae6398fb56b27f8f6a17d3297243a6d
  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. .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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