raster cache memory service protocol test

diff

diff --git a/packages/flutter_tools/lib/src/resident_runner.dart b/packages/flutter_tools/lib/src/resident_runner.dart
index 9008f0389b..a4fb521e6e 100644
--- a/packages/flutter_tools/lib/src/resident_runner.dart
+++ b/packages/flutter_tools/lib/src/resident_runner.dart
@@ -961,6 +961,13 @@ abstract class ResidentRunner {
     final List<FlutterView> views = await flutterDevices
       .first
       .vmService.getFlutterViews();
+
+    final Map<String, Object> memoryData = await flutterDevices.first.vmService.estimateRasterCacheMemory(
+      viewId: views.first.id,
+    );
+    print('estimateRasterCacheMemory data: $memoryData');
+
+
     final Map<String, Object> data = await flutterDevices.first.vmService.getSkSLs(
       viewId: views.first.id,
     );
diff --git a/packages/flutter_tools/lib/src/vmservice.dart b/packages/flutter_tools/lib/src/vmservice.dart
index 36c0172ed9..5acb64583a 100644
--- a/packages/flutter_tools/lib/src/vmservice.dart
+++ b/packages/flutter_tools/lib/src/vmservice.dart
@@ -477,6 +477,18 @@ extension FlutterVmService on vm_service.VmService {
     return response.json['SkSLs'] as Map<String, Object>;
   }

+  Future<Map<String, Object>> estimateRasterCacheMemory({
+    @required String viewId,
+  }) async {
+    final vm_service.Response response = await callMethod(
+      '_flutter.estimateRasterCacheMemory',
+      args: <String, String>{
+        'viewId': viewId,
+      },
+    );
+    return response.json;
+  }
+
   /// Flush all tasks on the UI thead for an attached Flutter view.
   ///
   /// This method is currently used only for benchmarking.