Added json result of test output to output debug directory.

tools/testing/dart/utils.dart

Index: tools/testing/dart/utils.dart
diff --git a/tools/testing/dart/utils.dart b/tools/testing/dart/utils.dart
index f0a59a95c7c58966efbd6b7494e87948d34d53fc..2c2ff849597c06ab2a66a7915f5e63a68d8ce51f 100644
--- a/tools/testing/dart/utils.dart
+++ b/tools/testing/dart/utils.dart
@@ -444,6 +444,10 @@ class TestUtils {
   /// test outcomes to this file.
   static const testOutcomeFileName = ".test-outcome.log";
 
+  /// If test.py was invoked with '--write-result-json-log it will write
+  /// test outcomes to this file in '--the debug-output-directory'.
+  static const testResultFileName = "result.log";

[Bill Hesse, 2017/09/01 11:56:14]

resultLogName

[mkroghj, 2017/09/04 10:43:35]

Acknowledged.

+
   static void ensureExists(String filename, Configuration configuration) {
     if (!configuration.listTests && !existsCache.doesFileExist(filename)) {
       throw "'$filename' does not exist";