[Paint Preview] Rename test flag to demo flag + hook up with PaintPreviewDemoManager

This CL:
1. renames the existing paint_preview_test flag to
   paint_preview_demo. This can only be enabled from about:flags.
2. Hooks up the app menu item that is bound to this flag to the
   PaintPreviewDemoManager class. When the menu item is selected, a
   Paint Preview of the current page is captured and shown. If the back
   button is clicked or the page is refreshed, the Paint Preview will be
   removed.

Bug: 1058405
Change-Id: Ifc96249609d3754508cd2ff8ae55ee0c7237bc7f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2087418
Commit-Queue: Mehran Mahmoudi <[email protected]>
Reviewed-by: Theresa  <[email protected]>
Reviewed-by: Calder Kitagawa <[email protected]>
Reviewed-by: Henrique Nakashima <[email protected]>
Cr-Commit-Position: refs/heads/master@{#750404}
19 files changed
tree: 89975df4e4121d8c58ccee247b298f12c7fb3bb0
  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. components/
  14. content/
  15. courgette/
  16. crypto/
  17. dbus/
  18. device/
  19. docs/
  20. extensions/
  21. fuchsia/
  22. gin/
  23. google_apis/
  24. google_update/
  25. gpu/
  26. headless/
  27. infra/
  28. ios/
  29. ipc/
  30. jingle/
  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. .vpython
  60. .vpython3
  61. .yapfignore
  62. AUTHORS
  63. BUILD.gn
  64. CODE_OF_CONDUCT.md
  65. codereview.settings
  66. DEPS
  67. ENG_REVIEW_OWNERS
  68. LICENSE
  69. LICENSE.chromium_os
  70. OWNERS
  71. PRESUBMIT.py
  72. PRESUBMIT_test.py
  73. PRESUBMIT_test_mocks.py
  74. README.md
  75. WATCHLISTS
README.md

Logo Chromium

Chromium is an open-source browser project that aims to build a safer, faster, and more stable way for all users to experience the web.

The project's web site is https://www.chromium.org.

Documentation in the source is rooted in docs/README.md.

Learn how to Get Around the Chromium Source Code Directory Structure .

For historical reasons, there are some small top level directories. Now the guidance is that new top level directories are for product (e.g. Chrome, Android WebView, Ash). Even if these products have multiple executables, the code should be in subdirectories of the product.