Fix race conditions in window snapshot code.

content/renderer/gpu/render_widget_compositor.cc

Index: content/renderer/gpu/render_widget_compositor.cc
diff --git a/content/renderer/gpu/render_widget_compositor.cc b/content/renderer/gpu/render_widget_compositor.cc
index b923533e508eb795717eea5000aea9d287cd240d..30240b90e96c8c099f765f322c8d2a85260156c1 100644
--- a/content/renderer/gpu/render_widget_compositor.cc
+++ b/content/renderer/gpu/render_widget_compositor.cc
@@ -377,6 +377,15 @@ const cc::Layer* RenderWidgetCompositor::GetRootLayer() const {
   return layer_tree_host_->root_layer();
 }
 
+void RenderWidgetCompositor::SetNeedsForcedRedraw() {
+  layer_tree_host_->SetNextCommitForcesRedraw();
+  if (threaded_) {

[enne (OOO), 2013/09/24 17:22:26]

Maybe just call RenderWidgetCompositor::setNeedsRedraw rather than replicating
this conditional?

+    layer_tree_host_->SetNeedsAnimate();
+  } else {
+    widget_->scheduleAnimation();
+  }
+}
+
 bool RenderWidgetCompositor::initialize(cc::LayerTreeSettings settings) {
   scoped_refptr<base::MessageLoopProxy> compositor_message_loop_proxy =
       RenderThreadImpl::current()->compositor_message_loop_proxy();