1 files changed, 58 insertions, 0 deletions
diff --git a/src/trace_processor/importers/json/json_tracker.h b/src/trace_processor/importers/json/json_tracker.h
new file mode 100644
index 000000000..ac2408393
--- /dev/null
+++ b/src/trace_processor/importers/json/json_tracker.h
@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef SRC_TRACE_PROCESSOR_IMPORTERS_JSON_JSON_TRACKER_H_
+#define SRC_TRACE_PROCESSOR_IMPORTERS_JSON_JSON_TRACKER_H_
+
+#include "src/trace_processor/importers/json/json_utils.h"
+#include "src/trace_processor/types/destructible.h"
+#include "src/trace_processor/types/trace_processor_context.h"
+
+namespace Json {
+class Value;
+}
+
+namespace perfetto {
+namespace trace_processor {
+
+class JsonTracker : public Destructible {
+ public:
+  JsonTracker(const JsonTracker&) = delete;
+  JsonTracker& operator=(const JsonTracker&) = delete;
+  explicit JsonTracker(TraceProcessorContext*);
+  virtual ~JsonTracker();
+
+  static JsonTracker* GetOrCreate(TraceProcessorContext* context) {
+    if (!context->json_tracker) {
+      context->json_tracker.reset(new JsonTracker(context));
+    }
+    return static_cast<JsonTracker*>(context->json_tracker.get());
+  }
+
+  void SetTimeUnit(json::TimeUnit time_unit) { time_unit_ = time_unit; }
+
+  base::Optional<int64_t> CoerceToTs(const Json::Value& value) {
+    return json::CoerceToTs(time_unit_, value);
+  }
+
+ private:
+  json::TimeUnit time_unit_ = json::TimeUnit::kUs;
+};
+
+}  // namespace trace_processor
+}  // namespace perfetto
+
+#endif  // SRC_TRACE_PROCESSOR_IMPORTERS_JSON_JSON_TRACKER_H_