Bug 1852098 - Generate mapping from Use Counter to use counter metric…

…s r=emilio

Differential Revision: https://phabricator.services.mozilla.com/D193249

dom/base/UseCounterMetrics.h

@@ -0,0 +1,31 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+#ifndef UseCounterMetrics_h_
+#define UseCounterMetrics_h_
+
+namespace mozilla::dom {
+
+enum WorkerKind : uint8_t;
+
+/**
+ * Increments the metric associated with the specific use counter.
+ *
+ * @param aUseCounter - The use counter for the feature that was used.
+ * @param aIsPage - Whether we should record to the page or document metric.
+ */
+void IncrementUseCounter(UseCounter aUseCounter, bool aIsPage);
+
+/**
+ * Increments the metric associated with the specific worker use counter.
+ *
+ * @param aUseCounter - The use counter for the feature that was used.
+ * @param aKind - The kind of worker that triggered the use counter.
+ */
+void IncrementWorkerUseCounter(UseCounterWorker aUseCounter, WorkerKind aKind);
+
+}  // namespace mozilla::dom
+
+#endif  // UseCounterMetrics_h_

dom/base/moz.build

@@ -283,6 +283,7 @@ EXPORTS.mozilla.dom += [
     "TreeOrderedArrayInlines.h",
     "TreeWalker.h",
     "UIDirectionManager.h",
+    "UseCounterMetrics.h",
     "UserActivation.h",
     "ViewportMetaData.h",
     "VisualViewport.h",
@@ -307,6 +308,7 @@ if CONFIG["COMPILE_ENVIRONMENT"]:
     )
 
 UNIFIED_SOURCES += [
+    "!UseCounterMetrics.cpp",
     "AbstractRange.cpp",
     "AnchorAreaFormRelValues.cpp",
     "AnimationFrameProvider.cpp",
@@ -617,3 +619,16 @@ GeneratedFile(
     entry_point="use_counter_list",
     inputs=["UseCountersWorker.conf"],
 )
+
+GeneratedFile(
+    "UseCounterMetrics.cpp",
+    script="usecounters.py",
+    entry_point="metric_map",
+    inputs=[
+        "UseCounters.conf",
+        "UseCountersWorker.conf",
+        "nsDeprecatedOperationList.h",
+        "!/layout/style/ServoCSSPropList.py",
+        "/servo/components/style/properties/counted_unknown_properties.py",
+    ],
+)