[test runner] Enable test results update from cmd line

Added the following command line argument:
```
-u[update], --update=[update]     Test results update mode.
Supported values are: "default", "platform", "metrics"
```

1 files changed, 3 insertions, 1 deletions

diff --git a/render-test/runner.hpp b/render-test/runner.hpp
index 2503372602..5214f203d8 100644
--- a/render-test/runner.hpp
+++ b/render-test/runner.hpp
@@ -14,7 +14,8 @@ struct TestMetadata;
 
 class TestRunner {
 public:
-    explicit TestRunner(Manifest);
+    enum class UpdateResults { NO, DEFAULT, PLATFORM, METRICS };
+    TestRunner(Manifest, UpdateResults);
     bool run(TestMetadata&);
     void reset();
 
@@ -43,4 +44,5 @@ private:
     };
     std::unordered_map<std::string, std::unique_ptr<Impl>> maps;
     Manifest manifest;
+    UpdateResults updateResults;
 };