Bug 1937636 - Add a profiler feature for recording flow markers. r=profiler-reviewers,julienw

Recording flow markers can be somewhat expensive because it can add a
lot of markers. e.g. a two markers for each microtask, markers
for the hang reporter between each runnable etc.

This adds a feature flag that we so we can conditionally
emit these markers.

Differential Revision: https://phabricator.services.mozilla.com/D232265

devtools/client/performance-new/shared/utils.js

@@ -577,6 +577,13 @@ const featureDescriptions = [
     value: "sandbox",
     title: "Report sandbox syscalls and logs in the profiler.",
   },
+  {
+    name: "Flows",
+    value: "flows",
+    title:
+      "Include all flow-related markers. These markers show the program flow better but " +
+      "can cause more overhead in some places than normal.",
+  },
 ];
 
 module.exports = {

mozglue/baseprofiler/public/BaseProfilerState.h

@@ -250,7 +250,12 @@ class MOZ_RAII AutoProfilerStats {
                                                                              \
     MACRO(26, "sandbox", Sandbox,                                            \
           "Report sandbox syscalls and logs in the "                         \
-          "profiler.")
+          "profiler.")                                                       \
+                                                                             \
+    MACRO(27, "flows", Flows,                                                \
+          "Include all flow-related markers. These markers show the program" \
+          "better but can cause more overhead in some places than normal.")
+
 // *** Synchronize with lists in ProfilerState.h and geckoProfiler.json ***
 
 struct ProfilerFeature {

toolkit/components/extensions/schemas/geckoProfiler.json

@@ -50,7 +50,8 @@
           "bandwidth",
           "memory",
           "tracing",
-          "sandbox"
+          "sandbox",
+          "flows"
         ]
       },
       {

tools/profiler/public/ProfilerState.h

@@ -131,7 +131,12 @@
                                                                            \
   MACRO(26, "sandbox", Sandbox,                                            \
         "Report sandbox syscalls and logs in the "                         \
-        "profiler.")
+        "profiler.")                                                       \
+                                                                           \
+  MACRO(27, "flows", Flows,                                                \
+        "Include all flow-related markers. These markers show the program" \
+        "better but can cause more overhead in some places than normal.")
+
 // *** Synchronize with lists in BaseProfilerState.h and geckoProfiler.json ***
 
 struct ProfilerFeature {