From 426d193ca6bb4b8949c97ee484055c0ef2e1e68e Mon Sep 17 00:00:00 2001
From: Adam Barth <abarth@chromium.org>
Date: Tue, 25 Nov 2014 12:11:59 -0800
Subject: [PATCH] Fix DCHECK(gr_texture) when running test_sky

We shouldn't bother trying to draw a 0x0 sky::Layer. It makes Ganesh unhappy.

R=ojan@chromium.org

Review URL: https://codereview.chromium.org/759763002
---
 compositor/layer_host.cc | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/compositor/layer_host.cc b/compositor/layer_host.cc
index ef6b543cd97..50fc24b7e48 100644
--- a/compositor/layer_host.cc
+++ b/compositor/layer_host.cc
@@ -75,6 +75,16 @@ void LayerHost::BeginFrame() {
 
   client_->BeginFrame(base::TimeTicks::Now());
 
+  // If the root layer is empty, there's no reason to draw into it. (In fact,
+  // Ganesh will get upset if we try.) Instead, we just schedule the ack that
+  // the frame is complete.
+  if (root_layer_->size().IsEmpty()) {
+    base::MessageLoop::current()->PostTask(
+        FROM_HERE,
+        base::Bind(&LayerHost::DidCompleteFrame, weak_factory_.GetWeakPtr()));
+    return;
+  }
+
   {
     mojo::GaneshContext::Scope scope(&ganesh_context_);
     ganesh_context_.gr()->resetContext();