WIP: Add support for additional flag-specified tracing categories.

telemetry/telemetry/internal/browser/browser_options.py

Index: telemetry/telemetry/internal/browser/browser_options.py
diff --git a/telemetry/telemetry/internal/browser/browser_options.py b/telemetry/telemetry/internal/browser/browser_options.py
index 80765ea09fabba0c5678815257c1bfe2cf0ba0d3..96fa802cc150feb8ef18092a4849a8346b43e2c6 100644
--- a/telemetry/telemetry/internal/browser/browser_options.py
+++ b/telemetry/telemetry/internal/browser/browser_options.py
@@ -114,6 +114,12 @@ class BrowserFinderOptions(optparse.Values):
     group.add_option('--print-bootstrap-deps',
                      action='store_true',
                      help='Output bootstrap deps list.')
+    group.add_option(
+        '--extra-chrome-categories', dest='extra_chrome_categories',
+        help='Filter string to enable additional chrome tracing categories.')

[sullivan, 2017/07/07 14:58:47]

Again, documentation on filter strings would be awesome to add here.

[charliea (OOO until 10-5), 2017/07/07 20:07:00]

"Filter strings are 1) a way to specify which tracing categories to enable and
disable in Chrome and 2) your worst nightmare."

... maybe not what we're going for, though.

+    group.add_option(
+        '--extra-atrace-categories', dest='extra_atrace_categories',

[sullivan, 2017/07/07 14:58:47]

Any ideas where to find documentation on available atrace categories?

[charliea (OOO until 10-5), 2017/07/07 20:06:59]

Apparently you can get the documentation from atrace --list_categories

https://developer.android.com/reference/android/support/test/rule/logging/Atr...

+        help='Comma-separated list of extra atrace categories.')
     parser.add_option_group(group)
 
     # Platform options