The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/ef2fb8006bf89909a10ecd1db6a4a8e60ea87043

commit ef2fb8006bf89909a10ecd1db6a4a8e60ea87043
Author: Eriko Kurimoto <elkurin@google.com>
Date: Wed Sep 05 09:34:54 2018

Implement shortcut to dump ax tree

Ax tree is stored in tree data structure to change output format easily.

Tree dump function is called with ChromeVox+D>T (dump tree).
TreeDumper is created only when ChromeVox+D>T is detected.

Bug:  877381 
Change-Id: I6078661e7cbaea02ef8a1faa0d3a5c3606247b7e
Reviewed-on: https://chromium-review.googlesource.com/1187853
Commit-Queue: Eriko Kurimoto <elkurin@google.com>
Reviewed-by: David Tseng <dtseng@chromium.org>
Reviewed-by: Yuki Awano <yawano@chromium.org>
Cr-Commit-Position: refs/heads/master@{#588804}
[modify] https://crrev.com/ef2fb8006bf89909a10ecd1db6a4a8e60ea87043/chrome/browser/resources/chromeos/chromevox/BUILD.gn
[modify] https://crrev.com/ef2fb8006bf89909a10ecd1db6a4a8e60ea87043/chrome/browser/resources/chromeos/chromevox/braille/nav_braille.js
[modify] https://crrev.com/ef2fb8006bf89909a10ecd1db6a4a8e60ea87043/chrome/browser/resources/chromeos/chromevox/chromevox/background/keymaps/next_keymap.json
[modify] https://crrev.com/ef2fb8006bf89909a10ecd1db6a4a8e60ea87043/chrome/browser/resources/chromeos/chromevox/chromevox/background/options.js
[modify] https://crrev.com/ef2fb8006bf89909a10ecd1db6a4a8e60ea87043/chrome/browser/resources/chromeos/chromevox/chromevox/background/prefs.js
[modify] https://crrev.com/ef2fb8006bf89909a10ecd1db6a4a8e60ea87043/chrome/browser/resources/chromeos/chromevox/chromevox/injected/console_tts.js
[modify] https://crrev.com/ef2fb8006bf89909a10ecd1db6a4a8e60ea87043/chrome/browser/resources/chromeos/chromevox/cvox2/background/command_handler.js
[modify] https://crrev.com/ef2fb8006bf89909a10ecd1db6a4a8e60ea87043/chrome/browser/resources/chromeos/chromevox/cvox2/background/event_stream_logger.js
[modify] https://crrev.com/ef2fb8006bf89909a10ecd1db6a4a8e60ea87043/chrome/browser/resources/chromeos/chromevox/cvox2/background/log.html
[modify] https://crrev.com/ef2fb8006bf89909a10ecd1db6a4a8e60ea87043/chrome/browser/resources/chromeos/chromevox/cvox2/background/log.js
[modify] https://crrev.com/ef2fb8006bf89909a10ecd1db6a4a8e60ea87043/chrome/browser/resources/chromeos/chromevox/cvox2/background/log_store.js
[modify] https://crrev.com/ef2fb8006bf89909a10ecd1db6a4a8e60ea87043/chrome/browser/resources/chromeos/chromevox/cvox2/background/log_store_test.extjs
[modify] https://crrev.com/ef2fb8006bf89909a10ecd1db6a4a8e60ea87043/chrome/browser/resources/chromeos/chromevox/cvox2/background/next_earcons.js
[add] https://crrev.com/ef2fb8006bf89909a10ecd1db6a4a8e60ea87043/chrome/browser/resources/chromeos/chromevox/cvox2/background/tree_dumper.js

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/d35d73c4e8702a3b89aa0f4f051a7e21dada66e1

commit d35d73c4e8702a3b89aa0f4f051a7e21dada66e1
Author: Eriko Kurimoto <elkurin@google.com>
Date: Wed Sep 05 11:27:24 2018

Enable ax tree to hide

The log of ax tree is long and makes it difficult to see the log stream.
By enabing and disabling the checkbox for each tree output,
tree log can wrapped.
Whether the tree is shown or hidden in the log page,
the tree is saved to log when 'Save Log' button clicked.

Bug:  877381 
Change-Id: I1029049345a9f4b0dea4066668e7314c01686eef
Reviewed-on: https://chromium-review.googlesource.com/1203494
Commit-Queue: Eriko Kurimoto <elkurin@google.com>
Reviewed-by: David Tseng <dtseng@chromium.org>
Reviewed-by: Yuki Awano <yawano@chromium.org>
Cr-Commit-Position: refs/heads/master@{#588830}
[modify] https://crrev.com/d35d73c4e8702a3b89aa0f4f051a7e21dada66e1/chrome/browser/resources/chromeos/chromevox/cvox2/background/log.js
[modify] https://crrev.com/d35d73c4e8702a3b89aa0f4f051a7e21dada66e1/chrome/browser/resources/chromeos/chromevox/cvox2/background/tree_dumper.js