Currently when an test from our /integration_test/ directory fails it isn't clear:

1. What exactly test (JS file or line) has failed.
2. What's the exact is waiting for.

There is a "pending" function [1] which prints out when some of helper functions is waiting/pooling.

It'd would be good if this function printed out what's the caller of the helper function so it tells us what test is failing/pending/timing out.

[1] - https://cs.chromium.org/chromium/src/ui/file_manager/integration_tests/test_util.js

Example output that "pending" currently shows when a test fails:
...
ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM default
[31960:31986:0329/003456.666358:WARNING:alsa_util.cc(24)] PcmOpen: plug:default,No such file or directory
[31960:31986:0329/003456.666457:ERROR:audio_output_resampler.cc(396)] Unable to open audio device in high latency mode.  Falling back to fake audio output.
[31960:31960:0329/003500.134613:INFO:CONSOLE(112)] "Element #directory-tree-context-menu > [command="#copy"]:not([disabled]) (maybe in iframe undefined) is not found.", source: chrome-extension://oobinhbdbiehknkpbpejbbpdbkdjmoco/test_util.js (112)
[31960:31960:0329/003503.196705:INFO:CONSOLE(112)] "Element #directory-tree-context-menu > [command="#copy"]:not([disabled]) (maybe in iframe undefined) is not found.", source: chrome-extension://oobinhbdbiehknkpbpejbbpdbkdjmoco/test_util.js (112)
[31960:31960:0329/003506.117774:INFO:CONSOLE(112)] "Element #directory-tree-context-menu > [command="#copy"]:not([disabled]) (maybe in iframe undefined) is not found.", source: chrome-extension://oobinhbdbiehknkpbpejbbpdbkdjmoco/test_util.js (112)
[31960:31960:0329/003506.519243:INFO:CONSOLE(0)] "Error in event handler for runtime.onSuspend: TypeError: The first argument is the receiver and must be an object", source: chrome-extension://dmboannefpncccogfdikhmhpmdnddgoe/_generated_background_page.html (0)
[31960:31960:0329/003509.181438:INFO:CONSOLE(112)] "Element #directory-tree-context-menu > [command="#copy"]:not([disabled]) (maybe in iframe undefined) is not found.", source: chrome-extension://oobinhbdbiehknkpbpejbbpdbkdjmoco/test_util.js (112)
[31960:31960:0329/003512.247962:INFO:CONSOLE(112)] "Element #directory-tree-context-menu > [command="#copy"]:not([disabled]) (maybe in iframe undefined) is not found.", source: chrome-extension://oobinhbdbiehknkpbpejbbpdbkdjmoco/test_util.js (112)
[31960:31960:0329/003515.109432:INFO:CONSOLE(112)] "Element #directory-tree-context-menu > [command="#copy"]:not([disabled]) (maybe in iframe undefined) is not found.", source: chrome-extension://oobinhbdbiehknkpbpejbbpdbkdjmoco/test_util.js (112)
[31960:31960:0329/003518.177163:INFO:CONSOLE(112)] "Element #directory-tree-context-menu > [command="#copy"]:not([disabled]) (maybe in iframe undefined) is not found.", source: chrome-extension://oobinhbdbiehknkpbpejbbpdbkdjmoco/test_util.js (112)
[31960:31960:0329/003521.260456:INFO:CONSOLE(112)] "Element #directory-tree-context-menu > [command="#copy"]:not([disabled]) (maybe in iframe undefined) is not found.", source: chrome-extension://oobinhbdbiehknkpbpejbbpdbkdjmoco/test_util.js (112)
BrowserTestBase received signal: Terminated. Backtrace:
#0 0x00000432b10c base::debug::StackTrace::StackTrace()
...


With my proposed patch: crrev.com/c/995242
------------------------------------------

...
[260320:260320:0405/133229.662128:INFO:CONSOLE(0)] "Styling master document from stylesheets defined in HTML Imports is deprecated. Please refer to https://goo.gl/EGXzpw for possible migration paths.", source:  (0)                                                          
Still waiting for the following processes to finish:
        out/cOS/browser_tests --gtest_also_run_disabled_tests --gtest_filter=DirectoryTreeContextMenu/FileManagerBrowserTest.Test/0 --single_process --test-launcher-output=/tmp/.org.chromium.Chromium.kvjdPQ/resultsgDvFq5/test_results.xml --user-data-dir=/tmp/.org.chromium
.Chromium.kvjdPQ/dAjIV7X
[260320:260320:0405/133233.683120:INFO:CONSOLE(136)] "at /file_manager/directory_tree_context_menu.js:125:23: Element #directory-tree-context-menu > [command="#copy"]:not([disabled]) (maybe in iframe undefined) is not found.", source: chrome-extension://oobinhbdbiehknkpbp
ejbbpdbkdjmoco/test_util.js (136)
[260320:260320:0405/133236.745054:INFO:CONSOLE(136)] "at /file_manager/directory_tree_context_menu.js:125:23: Element #directory-tree-context-menu > [command="#copy"]:not([disabled]) (maybe in iframe undefined) is not found.", source: chrome-extension://oobinhbdbiehknkpbp
ejbbpdbkdjmoco/test_util.js (136)
[260320:260320:0405/133239.558471:INFO:CONSOLE(0)] "Error in event handler for runtime.onSuspend: TypeError: The first argument is the receiver and must be an object", source: chrome-extension://dmboannefpncccogfdikhmhpmdnddgoe/_generated_background_page.html (0)
[260320:260320:0405/133239.804384:INFO:CONSOLE(136)] "at /file_manager/directory_tree_context_menu.js:125:23: Element #directory-tree-context-menu > [command="#copy"]:not([disabled]) (maybe in iframe undefined) is not found.", source: chrome-extension://oobinhbdbiehknkpbp
ejbbpdbkdjmoco/test_util.js (136)
[260320:260320:0405/133242.657637:INFO:CONSOLE(136)] "at /file_manager/directory_tree_context_menu.js:125:23: Element #directory-tree-context-menu > [command="#copy"]:not([disabled]) (maybe in iframe undefined) is not found.", source: chrome-extension://oobinhbdbiehknkpbp
ejbbpdbkdjmoco/test_util.js (136)
[260320:260320:0405/133245.713636:INFO:CONSOLE(136)] "at /file_manager/directory_tree_context_menu.js:125:23: Element #directory-tree-context-menu > [command="#copy"]:not([disabled]) (maybe in iframe undefined) is not found.", source: chrome-extension://oobinhbdbiehknkpbp
ejbbpdbkdjmoco/test_util.js (136)
BrowserTestBase received signal: Terminated. Backtrace:
#0 0x7fdc19227a7c base::debug::StackTrace::StackTrace()
#1 0x000002885205 Still waiting for the following processes to finish:
        out/cOS/browser_tests --gtest_also_run_disabled_tests --gtest_filter=DirectoryTreeContextMenu/FileManagerBrowserTest.Test/0 --single_process --test-launcher-output=/tmp/.org.chromium.Chromium.kvjdPQ/resultsgDvFq5/test_results.xml --user-data-dir=/tmp/.org.chromium
.Chromium.kvjdPQ/dAjIV7X
content::(anonymous namespace)::DumpStackTraceSignalHandler()
...