From 198094e427540470e5bfbadfc7cca085c46fd20d Mon Sep 17 00:00:00 2001
From: Adam Barth <abarth@chromium.org>
Date: Tue, 8 Dec 2015 14:46:35 -0800
Subject: [PATCH] Fix crash with empty rect

Don't attempt to draw with a zero-by-zero window.
---
 sky/shell/gpu/mojo/rasterizer_mojo.cc | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/sky/shell/gpu/mojo/rasterizer_mojo.cc b/sky/shell/gpu/mojo/rasterizer_mojo.cc
index 10a87d371..cd89f6260 100644
--- a/sky/shell/gpu/mojo/rasterizer_mojo.cc
+++ b/sky/shell/gpu/mojo/rasterizer_mojo.cc
@@ -54,6 +54,11 @@ void RasterizerMojo::Draw(uint64_t layer_tree_ptr,
   scoped_ptr<compositor::LayerTree> layer_tree(
       reinterpret_cast<compositor::LayerTree*>(layer_tree_ptr));
 
+  if (layer_tree->frame_size().isEmpty()) {
+    callback.Run();
+    return;
+  }
+
   MGLResizeSurface(layer_tree->frame_size().width(),
                    layer_tree->frame_size().height());
   SkCanvas* canvas = ganesh_canvas_.GetCanvas(0, layer_tree->frame_size());
-- 
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