debugger statement is ignored in iframes removed from the document

This patch is conditioning the message `ContextWillBeDestroyed` to `MainThreadDebugger` during context disposal to happen only if the reason we are disposing the context is not `ClearForClose`.
The reason for such change is that the context of a detached iframe can still be used to execute code via iframe's `eval` and it would be useful to debug such code.
`ContextWillBeDestroyed` sends V8Inspector a `contextDestroyed` message where the inspector disposes data structures related with that context. Such message is also sent to V8Inspector when a context gets collected
by V8 GC, meaning that we were prematurely disposing such data
structures during frame dettachment and disallowing debuggability for
code using those contexts.
Since InspectedContexts holds a weak reference to a context and there's no strong reference from V8Inspector, this change doesn't leak memory by
holding contexts alive. Since there are multiple tests that rely on
`Runtime.executionContextDestroyed` message, we updated them to perform a GC after frame detachment, so the test could still work as expected.

Bug: 1015462
Change-Id: I6014bd8ddbfb1d3838b5364ccc9520b3b363b5fd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2965275
Reviewed-by: Nate Chapin <japhet@chromium.org>
Reviewed-by: Mathias Bynens <mathias@chromium.org>
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Reviewed-by: Simon Zünd <szuend@chromium.org>
Commit-Queue: José Dapena Paz <jdapena@igalia.com>
Cr-Commit-Position: refs/heads/master@{#908362}
26 files changed
tree: d8ed1c5976aee5cdf78b1c970c83f2e3d386add7
  1. .clang-format
  2. .clang-tidy
  3. .eslintrc.js
  4. .git-blame-ignore-revs
  5. .gitattributes
  6. .gitignore
  7. .gn
  8. .mailmap
  9. .vpython
  10. .vpython3
  11. .yapfignore
  12. AUTHORS
  13. BUILD.gn
  14. CODE_OF_CONDUCT.md
  15. DEPS
  16. DIR_METADATA
  17. ENG_REVIEW_OWNERS
  18. LICENSE
  19. LICENSE.chromium_os
  20. OWNERS
  21. PRESUBMIT.py
  22. PRESUBMIT_test.py
  23. PRESUBMIT_test_mocks.py
  24. README.md
  25. WATCHLISTS
  26. android_webview/
  27. apps/
  28. ash/
  29. base/
  30. build/
  31. build_overrides/
  32. buildtools/
  33. cc/
  34. chrome/
  35. chromecast/
  36. chromeos/
  37. cloud_print/
  38. codelabs/
  39. codereview.settings
  40. components/
  41. content/
  42. courgette/
  43. crypto/
  44. dbus/
  45. device/
  46. docs/
  47. extensions/
  48. fuchsia/
  49. gin/
  50. google_apis/
  51. google_update/
  52. gpu/
  53. headless/
  54. infra/
  55. ios/
  56. ipc/
  57. jingle/
  58. media/
  59. mojo/
  60. native_client_sdk/
  61. net/
  62. pdf/
  63. ppapi/
  64. printing/
  65. remoting/
  66. rlz/
  67. sandbox/
  68. services/
  69. skia/
  70. sql/
  71. storage/
  72. styleguide/
  73. testing/
  74. third_party/
  75. tools/
  76. ui/
  77. url/
  78. weblayer/
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.

To check out the source code locally, don't use git clone! Instead, follow the instructions on how to get the code.

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.

If you found a bug, please file it at https://crbug.com/new.