[PaymentRequest] Add a kPaymentRequestShowWithoutGestureOrToken metric

This metric is intended to support the migration to enforcing a user
gesture or capability token requirement for PaymentRequest.show(). Once
capability delegation is available (but not yet required for
PaymentRequest.show()), we will use this metric to track how many sites
would be broken by the migration.

Design doc: go/wp-strict-user-gesture-dd
UKM review: https://docs.google.com/document/d/1cEUqVK16gQX7LevmoJKjMmpy10dwOcHMfkpJB2Df2NM/edit?resourcekey=0-onFNWCRQOiye9bohglUHbw#

Bug: 825270
Change-Id: I86d8108ea3fd2fa8c85ae592a83daae8a0a37dbc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2880514
Commit-Queue: Stephen McGruer <smcgruer@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#881220}
5 files changed
tree: bc415912faad4f01151233365e09b9af882bcf72
  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. .vpython
  61. .vpython3
  62. .yapfignore
  63. AUTHORS
  64. BUILD.gn
  65. CODE_OF_CONDUCT.md
  66. codereview.settings
  67. DEPS
  68. DIR_METADATA
  69. ENG_REVIEW_OWNERS
  70. LICENSE
  71. LICENSE.chromium_os
  72. OWNERS
  73. PRESUBMIT.py
  74. PRESUBMIT_test.py
  75. PRESUBMIT_test_mocks.py
  76. README.md
  77. WATCHLISTS
README.md

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