From cad442f87988b1a8081e210bc1d5adc66f990424 Mon Sep 17 00:00:00 2001
From: Jason Simmons <jsimmons@google.com>
Date: Wed, 17 Oct 2018 17:17:39 -0700
Subject: [PATCH] Provide an estimate of EngineLayer memory usage to the Dart
 GC

See https://github.com/flutter/flutter/issues/23171
---
 lib/ui/painting/engine_layer.cc | 7 +++++++
 lib/ui/painting/engine_layer.h  | 3 +++
 2 files changed, 10 insertions(+)

diff --git a/lib/ui/painting/engine_layer.cc b/lib/ui/painting/engine_layer.cc
index 5ff6e96f61574..afa3876ffb653 100644
--- a/lib/ui/painting/engine_layer.cc
+++ b/lib/ui/painting/engine_layer.cc
@@ -17,6 +17,13 @@ namespace blink {
 
 EngineLayer::~EngineLayer() = default;
 
+size_t EngineLayer::GetAllocationSize() {
+  // Provide an approximation of the total memory impact of this object to the
+  // Dart GC.  The ContainerLayer may hold references to a tree of other layers,
+  // which in turn may contain Skia objects.
+  return 3000;
+};
+
 IMPLEMENT_WRAPPERTYPEINFO(ui, EngineLayer);
 
 #define FOR_EACH_BINDING(V)  // nothing to bind
diff --git a/lib/ui/painting/engine_layer.h b/lib/ui/painting/engine_layer.h
index e79b5f8e63967..c578e88c9e88f 100644
--- a/lib/ui/painting/engine_layer.h
+++ b/lib/ui/painting/engine_layer.h
@@ -22,6 +22,9 @@ class EngineLayer : public RefCountedDartWrappable<EngineLayer> {
 
  public:
   ~EngineLayer() override;
+
+  size_t GetAllocationSize() override;
+
   static fml::RefPtr<EngineLayer> MakeRetained(
       std::shared_ptr<flow::ContainerLayer> layer) {
     return fml::MakeRefCounted<EngineLayer>(layer);