From 76d8335949d01e0083257fa5deccdccf3d862f51 Mon Sep 17 00:00:00 2001
From: Jason Simmons <jason-simmons@users.noreply.github.com>
Date: Thu, 15 Nov 2018 14:24:36 -0800
Subject: [PATCH] Reland "Clean up stale cache entries in Skia's GrContext"
 (flutter/engine#6867)

Check for software rendering modes that do not have a GrContext
---
 engine/src/flutter/shell/common/rasterizer.cc | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/engine/src/flutter/shell/common/rasterizer.cc b/engine/src/flutter/shell/common/rasterizer.cc
index 9f3317912e..e4d81df17a 100644
--- a/engine/src/flutter/shell/common/rasterizer.cc
+++ b/engine/src/flutter/shell/common/rasterizer.cc
@@ -16,6 +16,10 @@
 
 namespace shell {
 
+// The rasterizer will tell Skia to purge cached resources that have not been
+// used within this interval.
+static constexpr std::chrono::milliseconds kSkiaCleanupExpiration(15000);
+
 Rasterizer::Rasterizer(blink::TaskRunners task_runners)
     : Rasterizer(std::move(task_runners),
                  std::make_unique<flow::CompositorContext>()) {}
@@ -186,6 +190,10 @@ bool Rasterizer::DrawToSurface(flow::LayerTree& layer_tree) {
       external_view_embedder->SubmitFrame(surface_->GetContext());
     }
     FireNextFrameCallbackIfPresent();
+
+    if (surface_->GetContext())
+      surface_->GetContext()->performDeferredCleanup(kSkiaCleanupExpiration);
+
     return true;
   }