WebNN: Define Where in mojo and implement it in DirectML backend

According to the WebNN spec[1], Where operator selects the values from
the input or the other tensor depending on the corresponding Boolean
values of the condition tensor.

This CL defines Where operator in mojo and implement it in DirectML
backend, some unittests are also added.

This CL also fixes some naming nits:
`input` -> `true_value` and `other` -> `false_value`.

[1] https://pr-preview.s3.amazonaws.com/webmachinelearning/webnn/pull/478.html#api-mlgraphbuilder-where

Bug: 1273291
Change-Id: I3dac33d2c4c1d7f17a2819a2ddfffb42e4b5bb17
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5069382
Reviewed-by: Jiewei Qian <qjw@chromium.org>
Reviewed-by: Rafael Cintron <rafael.cintron@microsoft.com>
Commit-Queue: Mingming1 Xu <mingming1.xu@intel.com>
Reviewed-by: ningxin hu <ningxin.hu@intel.com>
Reviewed-by: Alex Gough <ajgo@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1231654}
11 files changed
tree: 4650770b7a8c2ec8494dd783f342f7e5a6feaafd
  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_web/
  22. gin/
  23. google_apis/
  24. google_update/
  25. gpu/
  26. headless/
  27. infra/
  28. ios/
  29. ipc/
  30. media/
  31. mojo/
  32. native_client_sdk/
  33. net/
  34. pdf/
  35. ppapi/
  36. printing/
  37. remoting/
  38. rlz/
  39. sandbox/
  40. services/
  41. skia/
  42. sql/
  43. storage/
  44. styleguide/
  45. testing/
  46. third_party/
  47. tools/
  48. ui/
  49. url/
  50. webkit/
  51. .clang-format
  52. .clang-tidy
  53. .clangd
  54. .eslintrc.js
  55. .git-blame-ignore-revs
  56. .gitattributes
  57. .gitignore
  58. .gitmodules
  59. .gn
  60. .mailmap
  61. .rustfmt.toml
  62. .vpython3
  63. .yapfignore
  64. ATL_OWNERS
  65. AUTHORS
  66. BUILD.gn
  67. CODE_OF_CONDUCT.md
  68. codereview.settings
  69. DEPS
  70. DIR_METADATA
  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
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