Mozart: Fix 0x0 crashes in example views.

apps/moterm/moterm_view.cc

Index: apps/moterm/moterm_view.cc
diff --git a/apps/moterm/moterm_view.cc b/apps/moterm/moterm_view.cc
index 4bf6abe43b6b7f5876fe5e9fd6c7f463391dcc8f..f248b9196513c207c5bdacf6d97f162ceda4f7b5 100644
--- a/apps/moterm/moterm_view.cc
+++ b/apps/moterm/moterm_view.cc
@@ -228,25 +228,32 @@ void MotermView::OnDraw(const mojo::gfx::composition::FrameInfo& frame_info,
   // TODO(vtl): Draw only the dirty region(s)?
   model_state_changes_.Reset();
 
-  const mojo::Size& size = *properties()->view_layout->size;
-  mojo::RectF bounds;
-  bounds.width = size.width;
-  bounds.height = size.height;
-
   auto update = mojo::gfx::composition::SceneUpdate::New();
-  mojo::gfx::composition::ResourcePtr moterm_resource =
-      ganesh_renderer()->DrawCanvas(
-          size, base::Bind(&MotermView::DrawContent, base::Unretained(this)));
-  DCHECK(moterm_resource);
-  update->resources.insert(kMotermImageResourceId, moterm_resource.Pass());
-
-  auto root_node = mojo::gfx::composition::Node::New();
-  root_node->hit_test_behavior = mojo::gfx::composition::HitTestBehavior::New();
-  root_node->op = mojo::gfx::composition::NodeOp::New();
-  root_node->op->set_image(mojo::gfx::composition::ImageNodeOp::New());
-  root_node->op->get_image()->content_rect = bounds.Clone();
-  root_node->op->get_image()->image_resource_id = kMotermImageResourceId;
-  update->nodes.insert(kRootNodeId, root_node.Pass());
+
+  const mojo::Size& size = *properties()->view_layout->size;
+  if (size.width > 0 && size.height > 0) {
+    mojo::RectF bounds;
+    bounds.width = size.width;
+    bounds.height = size.height;
+
+    mojo::gfx::composition::ResourcePtr moterm_resource =
+        ganesh_renderer()->DrawCanvas(
+            size, base::Bind(&MotermView::DrawContent, base::Unretained(this)));
+    DCHECK(moterm_resource);
+    update->resources.insert(kMotermImageResourceId, moterm_resource.Pass());
+
+    auto root_node = mojo::gfx::composition::Node::New();
+    root_node->hit_test_behavior =
+        mojo::gfx::composition::HitTestBehavior::New();
+    root_node->op = mojo::gfx::composition::NodeOp::New();
+    root_node->op->set_image(mojo::gfx::composition::ImageNodeOp::New());
+    root_node->op->get_image()->content_rect = bounds.Clone();
+    root_node->op->get_image()->image_resource_id = kMotermImageResourceId;
+    update->nodes.insert(kRootNodeId, root_node.Pass());
+  } else {
+    auto root_node = mojo::gfx::composition::Node::New();
+    update->nodes.insert(kRootNodeId, root_node.Pass());
+  }
 
   scene()->Update(update.Pass());