Update test result format

- Update trace file key to 'trace/1.json'. Per spec, key name should
  start with 'trace/' and extension should be '.json' since gtest
  output trace json.
- Update script test data as well;

Bug: 945711
Change-Id: I9fc36b154e68bae869f5221e243854847aaaf307
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1899309
Auto-Submit: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Mikhail Khokhlov <khokhlov@google.com>
Cr-Commit-Position: refs/heads/master@{#712771}

ash/shell/content/test/ash_content_test.cc

@@ -64,7 +64,7 @@ perf_test::LuciTestResult CreateTestResult(
     const std::vector<std::string>& tbm_metrics) {
   perf_test::LuciTestResult result =
       perf_test::LuciTestResult::CreateForGTest();
-  result.AddOutputArtifactFile("trace/1", trace_file, "application/json");
+  result.AddOutputArtifactFile("trace/1.json", trace_file, "application/json");
   for (auto& metric : tbm_metrics)
     result.AddTag("tbmv2", metric);
 

chrome/test/base/perf/performance_test.cc

@@ -79,7 +79,7 @@ perf_test::LuciTestResult CreateTestResult(
     const std::vector<std::string>& tbm_metrics) {
   perf_test::LuciTestResult result =
       perf_test::LuciTestResult::CreateForGTest();
-  result.AddOutputArtifactFile("trace/1", trace_file, "application/json");
+  result.AddOutputArtifactFile("trace/1.json", trace_file, "application/json");
   for (auto& metric : tbm_metrics)
     result.AddTag("tbmv2", metric);
 

tools/perf/testdata/dummy_luci_test_result_template.json

@@ -4,7 +4,7 @@
     "status": "PASS",
     "expected": true,
     "outputArtifacts":{
-      "trace": {
+      "trace/1.json": {
         "contentType":"application/json",
         "filePath":"FULL_TRACE_FILE_PATH"
       }