services/tracing/tracing.mojom

// Copyright 2014 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.

module tracing;

// To particate in the tracing ecosystem, implement the TraceController
// interface and connect to the tracing app. Then, when the controller's Start()
// function is called collect tracing data and pass it back via the
// TraceDataCollector interface up until Stop() is called.

[Client=TraceDataCollector]
interface TraceController {
  StartTracing(string categories);
  StopTracing();
};

[Client=TraceController]
interface TraceDataCollector {
  DataCollected(string json);
  EndTracing();
};

interface TraceCoordinator {
  // Request tracing data from all connected TraceControllers to stream to
  // |stream|.
  Start(handle<data_pipe_producer> stream, string categories);

  // Stop tracing and flush results to file.
  StopAndFlush();
};