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// Copyright 2019 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.mojom;
// This interface is used to receive callbacks from BackgroundTracingAgent.
interface BackgroundTracingAgentClient {
OnTriggerBackgroundTrace(string histogram_name);
// This interface is used to allow clients (the browser process) to monitor for
// specific metrics being hit and control when to start/stop tracing in
// response. How metrics are communicated b/w processes is not covered here.
interface BackgroundTracingAgent {
// Call this method to begin reporting metrics corresponding to the named
// histogram. Lower and upper bound values constrain what data is reported.
// This results in OnTriggerBackgroundTrace callbacks (multiple if |repeat|
// is set to true). If a histogram event does not match and |repeat| is
// false, then OnAbortBackgroundTrace is called.
SetUMACallback(string histogram_name,
int32 histogram_lower_value,
int32 histogram_upper_value,
bool repeat);
// Call this method to stop reporting metrics corresponding to the named
// histogram.
ClearUMACallback(string histogram_name);
// This interface is used to construct a BackgroundTracingAgent.
interface BackgroundTracingAgentProvider {
// Results in an OnInitialized callback to |client|.
Create(uint64 tracing_process_id,
pending_remote<BackgroundTracingAgentClient> client,
pending_receiver<BackgroundTracingAgent> agent);