roll forward to cl/317978613

Signed-off-by: Alexey Polyudov <apolyudov@google.com>
Change-Id: I988b9fa534d61583b2af67dfef002fa2a5823fb7

cpp/platform_v2/impl/g3/log_message.h

@@ -0,0 +1,43 @@
+// Copyright 2020 Google LLC
+//
+// 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
+//
+//     https://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 PLATFORM_V2_IMPL_G3_LOG_MESSAGE_H_
+#define PLATFORM_V2_IMPL_G3_LOG_MESSAGE_H_
+
+#include "base/logging.h"
+#include "platform_v2/api/log_message.h"
+
+namespace location {
+namespace nearby {
+namespace g3 {
+
+// See documentation in cpp/platform_v2/api/log_message.h
+class LogMessage : public api::LogMessage {
+ public:
+  LogMessage(const char* file, int line, Severity severity);
+  ~LogMessage() override;
+
+  void Print(const char* format, ...) override;
+
+  std::ostream& Stream() override;
+
+ private:
+  absl::LogStreamer log_streamer_;
+};
+
+}  // namespace g3
+}  // namespace nearby
+}  // namespace location
+
+#endif  // PLATFORM_V2_IMPL_G3_LOG_MESSAGE_H_