Add isolate for content_browsertests with --site-per-process.

testing/buildbot/gn_isolate_map.pyl

Index: testing/buildbot/gn_isolate_map.pyl
diff --git a/testing/buildbot/gn_isolate_map.pyl b/testing/buildbot/gn_isolate_map.pyl
index eee39fce0b81c3ef222b3ce8c881858e10490820..834f23b13ae0590cf6c92ac6bb2102703a82bec5 100644
--- a/testing/buildbot/gn_isolate_map.pyl
+++ b/testing/buildbot/gn_isolate_map.pyl
@@ -11,13 +11,16 @@
 # much always the same as the Ninja target name, since GYP target names are not
 # hierarchical).
 #
+# The 'label' field specifies the matching GN label for the given ninja
+# target.
+#
 # The 'type' field is used to determine what the command line for the test
 # needs to be; valid values are:
 #
-# "windowed_test_launcher"
-# : the test is a gtest-based test that uses the 'brave-new-test-launcher'
-#   from //base/test:test_support and needs to run under Xvfb if run on
-#   an X11-based platform (use_x11=true).
+#  "windowed_test_launcher"
+#  : the test is a gtest-based test that uses the 'brave-new-test-launcher'
+#    from //base/test:test_support and needs to run under Xvfb if run on
+#    an X11-based platform (use_x11=true).
 #  "console_test_launcher"
 #  : the test is a gtest-based test that uses the 'brave-new-test-launcher'
 #    from //base/test:test_support but does not need Xvfb.
@@ -28,9 +31,28 @@
 #  : the test is a standalone executable; it may take an optional list of
 #    command line arguments in the 'args' field, but otherwise needs no
 #    extra files or special handling.
+#  "script"
+#  : the test is a python script; the path to the script is specified in
+#    the "script" field.
 #  "unknown"
 #  : (the default), which indicates that we don't know what the command line
 #    needs to be (this is a fatal error).
+#
+# The optional 'args' field can be used to append extra command line
+# args onto the command line determined by the 'type'. If not specified,
+# it defaults to an empty list (no extra args).
+#
+# The optional 'label_type' field can be used in conjunction with
+# 'type' == 'console_test_launcher' or 'type' == 'windowed_test_launcher'
+# to indicate that even though the command line
+# to use follows the test_launcher patterns, the actual GN label refers
+# to a different type of thing (usually a 'group') and so MB can find
+# the generated runtime files in the right place. This is used, for
+# example, in content_site_isolation_browsertests .
+#
+# The optional 'script' field is used when 'type' == 'script', and
+# specifies the GN path to the corresponding python file, e.g.
+# "//testing/scripts/foo.py".
 
 {
   "accessibility_unittests":  {
@@ -153,6 +175,12 @@
     "type": "raw",
     "args": [],
   },
+  "content_site_isolation_browsertests": {
+    "label": "//content/test:content_site_isolation_browsertests",
+    "label_type": "group",
+    "type": "windowed_test_launcher",
+    "args": ["--site-per-process", "--test-launcher-filter-file=src/testing/buildbot/filters/site-per-process.content_browsertests.filter"],
+  },
   "content_unittests": {
     "label": "//content/test:content_unittests",
     "type": "windowed_test_launcher",