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Add experiment for enabling frames and screenshots #212

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Merged
sbuggay merged 10 commits into from
Nov 13, 2025
Merged

Add experiment for enabling frames and screenshots #212

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32d58e2
Remove RN exclusion for frames and screenshots
sbuggay Oct 22, 2025
689b29f
Remove import
sbuggay Oct 22, 2025
83c5d8f
Remove isReactNative
sbuggay Oct 22, 2025
93152ea
Place frames under experiment
sbuggay Nov 3, 2025
977d403
Cleanup experiment
sbuggay Nov 3, 2025
ba292d9
Use correct experiment
sbuggay Nov 3, 2025
e4887b2
Merge branch 'main' into users/devanb/frames
sbuggay Nov 4, 2025
e2b33cb
Merge branch 'main' into users/devanb/frames
sbuggay Nov 12, 2025
8855c93
Fix experiment
sbuggay Nov 12, 2025
6ac687d
Add back frames track if not RN
sbuggay Nov 13, 2025
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3 changes: 2 additions & 1 deletion front_end/core/host/UserMetrics.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -985,10 +985,11 @@ export enum DevtoolsExperiments {
'timeline-alternative-navigation' = 104,
// 106 was historically used [https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/6230097]
// next experiment should be 107
'timeline-frames' = 108,
/* eslint-enable @typescript-eslint/naming-convention */

// Increment this when new experiments are added.
MAX_VALUE = 106,
MAX_VALUE = 108,
}

// Update DevToolsIssuesPanelIssueExpanded from tools/metrics/histograms/enums.xml if new enum is added.
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1 change: 1 addition & 0 deletions front_end/core/root/Runtime.ts
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Expand Up @@ -332,6 +332,7 @@ export const enum ExperimentName {
TIMELINE_DEBUG_MODE = 'timeline-debug-mode',
TIMELINE_ENHANCED_TRACES = 'timeline-enhanced-traces',
TIMELINE_COMPILED_SOURCES = 'timeline-compiled-sources',
TIMELINE_FRAMES = 'timeline-frames',
TIMELINE_EXPERIMENTAL_INSIGHTS = 'timeline-experimental-insights',
TIMELINE_DIM_UNRELATED_EVENTS = 'timeline-dim-unrelated-events',
TIMELINE_ALTERNATIVE_NAVIGATION = 'timeline-alternative-navigation',
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2 changes: 2 additions & 0 deletions front_end/entrypoints/main/MainImpl.ts
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Expand Up @@ -301,6 +301,8 @@ export class MainImpl {
Root.Runtime.experiments.register(
Root.Runtime.ExperimentName.TIMELINE_DEBUG_MODE,
'Performance panel: Enable debug mode (trace event details, etc)', true);
Root.Runtime.experiments.register(
Root.Runtime.ExperimentName.TIMELINE_FRAMES, 'Performance panel: Enable frames track', true);

// Debugging
Root.Runtime.experiments.register('instrumentation-breakpoints', 'Enable instrumentation breakpoints', true);
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9 changes: 1 addition & 8 deletions front_end/panels/timeline/TimelineFlameChartDataProvider.ts
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Expand Up @@ -106,8 +106,6 @@ const i18nString = i18n.i18n.getLocalizedString.bind(undefined, str_);

export class TimelineFlameChartDataProvider extends Common.ObjectWrapper.ObjectWrapper<EventTypes> implements
PerfUI.FlameChart.FlameChartDataProvider {
private isReactNative = false;

private droppedFramePatternCanvas: HTMLCanvasElement;
private partialFramePatternCanvas: HTMLCanvasElement;
private timelineDataInternal: PerfUI.FlameChart.FlameChartTimelineData|null = null;
Expand Down Expand Up @@ -145,11 +143,6 @@ export class TimelineFlameChartDataProvider extends Common.ObjectWrapper.ObjectW
constructor() {
super();

// [RN] Used to scope down available features for React Native targets
this.isReactNative = Root.Runtime.experiments.isEnabled(
Root.Runtime.ExperimentName.REACT_NATIVE_SPECIFIC_UI,
);

this.reset();

this.droppedFramePatternCanvas = document.createElement('canvas');
Expand Down Expand Up @@ -615,7 +608,7 @@ export class TimelineFlameChartDataProvider extends Common.ObjectWrapper.ObjectW
// In CPU Profiles the trace data will not have frames nor
// screenshots, so we can keep this call as it will be a no-op in
// these cases.
if (!this.isReactNative) {
if (Root.Runtime.experiments.isEnabled(Root.Runtime.ExperimentName.TIMELINE_FRAMES)) {
this.#appendFramesAndScreenshotsTrack();
}

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1 change: 1 addition & 0 deletions front_end/testing/EnvironmentHelpers.ts
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Expand Up @@ -128,6 +128,7 @@ const REGISTERED_EXPERIMENTS = [
Root.Runtime.ExperimentName.TIMELINE_EXPERIMENTAL_INSIGHTS,
Root.Runtime.ExperimentName.TIMELINE_DIM_UNRELATED_EVENTS,
Root.Runtime.ExperimentName.TIMELINE_ALTERNATIVE_NAVIGATION,
Root.Runtime.ExperimentName.TIMELINE_FRAMES,
Root.Runtime.ExperimentName.REACT_NATIVE_SPECIFIC_UI,
Root.Runtime.ExperimentName.NOT_REACT_NATIVE_SPECIFIC_UI,
];
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1 change: 1 addition & 0 deletions front_end/ui/visual_logging/KnownContextValues.ts
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Expand Up @@ -3495,6 +3495,7 @@ export const knownContextValues = new Set([
'time',
'timeline',
'timeline-alternative-navigation',
'timeline-frames',
'timeline-capture-layers-and-pictures',
'timeline-capture-selector-stats',
'timeline-compiled-sources',
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