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48de25e19b
Dart invokes Start/StopTracing callbacks within the _setVMTimelineFlags service method whenever the embedder timeline stream toggles on or off. Flutter's implementation of these callbacks was modifying the set of enabled streams, which could override the intended behavior of _setVMTimelineFlags. Start/StopTracing will now only control Flutter's embedder-specific log. Also needed to change the Flutter engine's --trace-startup flag to set the corresponding timeline stream flag on the Dart VM.
61 lines
1.6 KiB
C++
61 lines
1.6 KiB
C++
// Copyright 2015 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef __SKY_SHELL_TRACING_CONTROLLER__
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#define __SKY_SHELL_TRACING_CONTROLLER__
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#include "base/macros.h"
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#include "base/files/file.h"
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namespace sky {
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namespace shell {
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class TracingController {
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public:
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TracingController();
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~TracingController();
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void StartTracing();
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void StopTracing();
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// Enables tracing in base. Only use this if an instance of a tracing
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// controller cannot be obtained (can happen early in the lifecycle of the
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// process). In most cases, the |StartTracing| method on an instance of the
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// tracing controller should be used.
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static void StartBaseTracing();
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base::FilePath PictureTracingPathForCurrentTime() const;
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base::FilePath PictureTracingPathForCurrentTime(base::FilePath dir) const;
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bool tracing_active() const { return tracing_active_; }
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void set_traces_base_path(const base::FilePath& base_path) {
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traces_base_path_ = base_path;
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}
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void set_picture_tracing_enabled(bool enabled) {
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picture_tracing_enabled_ = enabled;
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}
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bool picture_tracing_enabled() const { return picture_tracing_enabled_; }
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private:
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base::FilePath traces_base_path_;
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bool picture_tracing_enabled_;
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bool tracing_active_;
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void StopBaseTracing();
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base::FilePath TracePathWithExtension(base::FilePath dir,
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std::string extension) const;
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DISALLOW_COPY_AND_ASSIGN(TracingController);
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};
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} // namespace shell
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} // namespace sky
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#endif /* defined(__SKY_SHELL_TRACING_CONTROLLER__) */
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