[Contextual Tasks] Pass session handle to Contextual Tasks UI

Currently, the LensQueryFlowRouter creates a session handle to upload
page context and images. However, when the Contextual Tasks side panel
is opened to show results, this handle is not transferred, potentially
leading to lost context or the creation of duplicate sessions.

This change updates `StartTaskUiInSidePanel` to accept a
`ContextualSearchSessionHandle`. The `LensQueryFlowRouter` now moves
its pending session handle to the UI service when opening the panel.
The service then assigns this handle to the
`ContextualSearchWebContentsHelper` associated with the side panel's
WebContents.

Bug: 461909986, 461911377
Change-Id: I921127acdb3c51b4e2ba3df7a5d1de785e568bd3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7239426
Commit-Queue: Juan Mojica <juanmojica@google.com>
Reviewed-by: Duncan Mercer <mercerd@google.com>
Cr-Commit-Position: refs/heads/main@{#1556443}
9 files changed
tree: 1780a14cbd6e899548dbd6d41ac5b1a4901233c7
  1. .gemini/
  2. .github/
  3. agents/
  4. android_webview/
  5. apps/
  6. ash/
  7. base/
  8. build/
  9. build_overrides/
  10. buildtools/
  11. cc/
  12. chrome/
  13. chromecast/
  14. chromeos/
  15. codelabs/
  16. components/
  17. content/
  18. crypto/
  19. dbus/
  20. device/
  21. docs/
  22. extensions/
  23. fuchsia_web/
  24. gin/
  25. google_apis/
  26. gpu/
  27. headless/
  28. infra/
  29. ios/
  30. ipc/
  31. media/
  32. mojo/
  33. net/
  34. pdf/
  35. printing/
  36. remoting/
  37. rlz/
  38. sandbox/
  39. services/
  40. skia/
  41. sql/
  42. storage/
  43. styleguide/
  44. testing/
  45. third_party/
  46. tools/
  47. ui/
  48. url/
  49. webkit/
  50. .clang-format
  51. .clang-tidy
  52. .clangd
  53. .cursorignore
  54. .geminiignore
  55. .git-blame-ignore-revs
  56. .gitallowed
  57. .gitattributes
  58. .gitignore
  59. .gitmodules
  60. .gn
  61. .mailmap
  62. .rustfmt.toml
  63. .vpython3
  64. .yapfignore
  65. ATL_OWNERS
  66. AUTHORS
  67. BUILD.gn
  68. CODE_OF_CONDUCT.md
  69. codereview.settings
  70. CPPLINT.cfg
  71. CRYPTO_OWNERS
  72. DEPS
  73. DIR_METADATA
  74. LICENSE
  75. LICENSE.chromium_os
  76. OWNERS
  77. PRESUBMIT.py
  78. PRESUBMIT_test.py
  79. PRESUBMIT_test_mocks.py
  80. README.md
  81. SECURITY_OWNERS
  82. WATCHLISTS
README.md

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