Add 'flog' service implementation.

mojo/services/flog/cpp/flog.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MOJO_SERVICES_FLOG_CPP_FLOG_H_
 #define MOJO_SERVICES_FLOG_CPP_FLOG_H_
 
 #include <atomic>
 #include <memory>
 
@@ skipping 77 matching lines @@
 
 #define FLOG(channel_name, call) channel_name->call
 
 #define FLOG_ID(channel_name) channel_name->channel()->id()
 
 #endif
 
 // Thread-safe logger for all channels in a given process.
 class Flog {
  public:
-  static void Initialize(ApplicationImpl* app, const std::string& label) {
+  static void Initialize(Shell* shell, const std::string& label) {
     MOJO_DCHECK(!logger_);
     FlogServicePtr flog_service;
     FlogLoggerPtr flog_logger;
-    ConnectToService(app->shell(), "mojo:flog", GetProxy(&flog_service));
+    ConnectToService(shell, "mojo:flog", GetProxy(&flog_service));
     flog_service->CreateLogger(GetProxy(&flog_logger), label);
     logger_ = flog_logger.Pass();
   }
 
   // Sets the flog logger singleton.
   static void Initialize(FlogLoggerPtr flog_logger) {
     MOJO_DCHECK(!logger_);
     logger_ = flog_logger.Pass();
   }
 
@@ skipping 30 matching lines @@
 
   // Logs the deletion of a channel.
   static void LogChannelDeletion(uint32_t channel_id) {
     if (!logger_) {
       return;
     }
 
     logger_->LogChannelDeletion(GetTimeTicksNow(), channel_id);
   }
 
+  // TODO(dalesat): Add method for text/file/line
+
  private:
   static std::atomic_ulong last_allocated_channel_id_;
   static FlogLoggerPtr logger_;
 };
 
 // Channel backing a FlogProxy.
 class FlogChannel : public MessageReceiverWithResponder {
  public:
   FlogChannel(const char* channel_type_name);
 
@@ skipping 24 matching lines @@
   }
 
  private:
   explicit FlogProxy() : T::Proxy_(new FlogChannel(T::Name_)) {}
 };
 
 }  // namespace flog
 }  // namespace mojo
 
 #endif  // MOJO_SERVICES_FLOG_CPP_FLOG_H_