ui: Add Arm PMU recorder plugin

Add `com.arm.ArmPmuRecorder` plugin that registers a
new PMU recording subpage in the recording section to configure
CPU PMUs to capture

The PMU page lets users load local Arm telemetry CPU specs and create
multiple recording configurations. Each configuration can select the CPU
model, optional target CPU list, which PMUs and sampling configuration
to use.

In the UI, users can select PMUs to record by choosing metrics applicable to the
selected CPU. Two metric views are available: a flat list and a tree view that
follows the topdown specification for the chosen CPU.

The plugin depends on ArmTelemetrySpecPlugin for spec parsing and
validation, and updates the shared telemetry spec registry so the
loaded specs are available to other Arm telemetry features.

Author: abhmen01

ui/src/plugins/com.arm.ArmPmuRecorder/index.ts

@@ -0,0 +1,31 @@
+// Copyright (C) 2026 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import {App} from '../../public/app';
+import {PerfettoPlugin} from '../../public/plugin';
+import RecordTraceV2Plugin, {
+  registerRecordSubpageProvider,
+} from '../dev.perfetto.RecordTraceV2';
+import ArmTelemetrySpecPlugin from '../com.arm.ArmTelemetrySpec';
+import {pmuRecordSection} from './pmu';
+
+export default class implements PerfettoPlugin {
+  static readonly id = 'com.arm.ArmPmuRecorder';
+  static readonly description = 'Arm PMU recording page';
+  static readonly dependencies = [RecordTraceV2Plugin, ArmTelemetrySpecPlugin];
+
+  static onActivate(app: App): void {
+    registerRecordSubpageProvider((recMgr) => pmuRecordSection(recMgr, app));
+  }
+}