Add snippet for enabling diagnostic stack traces

compose/snippets/src/main/java/com/example/compose/snippets/performance/Stacktraces.kt

@@ -0,0 +1,39 @@
+/*
+ * Copyright 2025 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
+ *
+ *     https://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.
+ */
+
+package com.example.compose.snippets.performance
+
+import android.app.Application
+import androidx.compose.runtime.Composer
+import androidx.compose.runtime.tooling.ComposeStackTraceMode
+import com.google.maps.android.ktx.BuildConfig
+
+// [START android_compose_stacktraces_enable]
+class SampleStackTracesEnabledApp : Application() {
+
+    override fun onCreate() {
+        // If the App is a debug variant, include the source information,
+        // otherwise do the less accurate GroupKeys option through Auto.
+        Composer.setDiagnosticStackTraceMode(
+            if (BuildConfig.DEBUG) {
+                ComposeStackTraceMode.SourceInformation
+            } else {
+                ComposeStackTraceMode.Auto
+            }
+        )
+    }
+}
+// [END android_compose_stacktraces_enable]