cc: Use impl-side painting in LTH context lost tests.

cc/trees/layer_tree_host_impl.cc

Index: cc/trees/layer_tree_host_impl.cc
diff --git a/cc/trees/layer_tree_host_impl.cc b/cc/trees/layer_tree_host_impl.cc
index 2278a4ac23330a062951732300ed9ce145b70cb4..eab2328a95f567205c7c10c51166bd367ea4890b 100644
--- a/cc/trees/layer_tree_host_impl.cc
+++ b/cc/trees/layer_tree_host_impl.cc
@@ -1620,6 +1620,9 @@ void LayerTreeHostImpl::DidDrawAllLayers(const FrameData& frame) {
   // Once all layers have been drawn, pending texture uploads should no
   // longer block future uploads.
   resource_provider_->MarkPendingUploadsAsNonBlocking();
+
+  if (active_tree()->RequiresHighResToDraw())
+    active_tree()->ResetRequiresHighResToDraw();

[danakj, 2014/09/10 16:03:31]

Can you just make the tests call Swap if they need to? They're skipping
behaviour we'd expect to see in reality.

[sohanjg, 2014/09/11 06:07:57]

Done.

 }
 
 void LayerTreeHostImpl::FinishAllRendering() {
@@ -2080,6 +2083,12 @@ bool LayerTreeHostImpl::InitializeRenderer(
     return false;
 
   output_surface_ = output_surface.Pass();
+
+  // There will not be anything to draw here, so set high res
+  // to avoid checkerboards, typically when we are recovering
+  // from lost context.
+  active_tree_->SetRequiresHighResToDraw();

[danakj, 2014/09/10 16:03:31]

can you move this down below us creating all the things? Maybe at the end of
this method is fine.

[sohanjg, 2014/09/11 06:07:57]

Done.

+
   resource_provider_ =
       ResourceProvider::Create(output_surface_.get(),
                                shared_bitmap_manager_,