Memory test on scrolling large images quickly (#46184)

dev/devicelab/manifest.yaml

diff --git a/dev/devicelab/manifest.yaml b/dev/devicelab/manifest.yaml
index cf6f8cd..7df2641 100644
--- a/dev/devicelab/manifest.yaml
+++ b/dev/devicelab/manifest.yaml
@@ -670,6 +670,12 @@
     stage: devicelab
     required_agent_capabilities: ["linux/android"]
 
+  fast_scroll_large_images__memory:
+    description: >
+      Measures memory usage for scrolling through a list of large images.
+    stage: devicelab
+    required_agent_capabilities: ["mac/android"]
+
   analyzer_benchmark:
     description: >
       Measures the speed of Dart analyzer.