Register memory info command on vmservice for Android devices (#45568)

packages/flutter_tools/lib/src/device.dart

diff --git a/packages/flutter_tools/lib/src/device.dart b/packages/flutter_tools/lib/src/device.dart
index 46b65a5..3a539b8 100644
--- a/packages/flutter_tools/lib/src/device.dart
+++ b/packages/flutter_tools/lib/src/device.dart
@@ -423,6 +423,14 @@
   /// Stop an app package on the current device.
   Future<bool> stopApp(covariant ApplicationPackage app);
 
+  /// Query the current application memory usage..
+  ///
+  /// If the device does not support this callback, an empty map
+  /// is returned.
+  Future<MemoryInfo> queryMemoryInfo() {
+    return Future<MemoryInfo>.value(const MemoryInfo.empty());
+  }
+
   Future<void> takeScreenshot(File outputFile) => Future<void>.error('unimplemented');
 
   @override
@@ -487,6 +495,25 @@
   void dispose() {}
 }
 
+/// Information about an application's memory usage.
+abstract class MemoryInfo {
+  /// Const constructor to allow subclasses to be const.
+  const MemoryInfo();
+
+  /// Create a [MemoryInfo] object with no information.
+  const factory MemoryInfo.empty() = _NoMemoryInfo;
+
+  /// Convert the object to a JSON representation suitable for serialization.
+  Map<String, Object> toJson();
+}
+
+class _NoMemoryInfo implements MemoryInfo {
+  const _NoMemoryInfo();
+
+  @override
+  Map<String, Object> toJson() => <String, Object>{};
+}
+
 class DebuggingOptions {
   DebuggingOptions.enabled(
     this.buildInfo, {