Add structured test id upload support to resuldb uploader

Not sure how to roll this to src after landing.
This is similar to changes for structured-test-ids in changes such as:
https://source.chromium.org/chromium/chromium/src/+/main:testing/scripts/common.py;l=203?q=common.py&ss=chromium

Bug:418015486
Change-Id: I742a6a9e7b04735e31aa1b893a1cbffc9d6e3188
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/7173696
Commit-Queue: Benjamin Joyce (Ben) <bjoyce@google.com>
Reviewed-by: Yiwei Zhang <yiwzhang@google.com>

rdb_wrapper.py

@@ -37,11 +37,19 @@ class ResultSink(object):
             elapsed_time: the time taken to invoke the presubmit function
             failure_reason (str or None): if set, the failure reason
         """
+        # Source comes from:
+        # infra/go/src/go.chromium.org/luci/resultdb/sink/proto/v1/test_result.proto
+        struct_test_dict = {
+            'coarseName': None,  # Not used for flat tests.
+            'fineName': None,  # Not used for flat tests.
+            'caseNameComponents': [str(function_name)],
+        }
         tr = {
             'testId': self._prefix + function_name,
             'status': status,
             'expected': status == STATUS_PASS,
-            'duration': '{:.9f}s'.format(elapsed_time)
+            'duration': '{:.9f}s'.format(elapsed_time),
+            'testIdStructured': struct_test_dict,
         }
         if failure_reason:
             if len(failure_reason) > _FAILURE_REASON_LENGTH_LIMIT:

tests/rdb_wrapper_test.py

@@ -76,6 +76,12 @@ class TestClient(unittest.TestCase):
 
 
 class TestResultSink(unittest.TestCase):
+    struct_test_dict = {
+        'coarseName': None,
+        'fineName': None,
+        'caseNameComponents': ['function_foo'],
+    }
+
     def test_report(self):
         session = mock.MagicMock()
         sink = rdb_wrapper.ResultSink(session, 'http://host', 'test_id_prefix/')
@@ -85,6 +91,7 @@ class TestResultSink(unittest.TestCase):
             'status': rdb_wrapper.STATUS_PASS,
             'expected': True,
             'duration': '123.000000000s',
+            'testIdStructured': TestResultSink.struct_test_dict,
         }
         session.post.assert_called_once_with(
             'http://host',
@@ -100,6 +107,7 @@ class TestResultSink(unittest.TestCase):
             'status': rdb_wrapper.STATUS_PASS,
             'expected': True,
             'duration': '123.000000000s',
+            'testIdStructured': TestResultSink.struct_test_dict,
             'failureReason': {
                 'primaryErrorMessage': 'Bad CL.',
             },
@@ -121,6 +129,7 @@ class TestResultSink(unittest.TestCase):
             'status': rdb_wrapper.STATUS_PASS,
             'expected': True,
             'duration': '123.000000000s',
+            'testIdStructured': TestResultSink.struct_test_dict,
             'failureReason': {
                 'primaryErrorMessage': expected_truncated_error,
             },