cc: Move worker threads to content.

mojo/services/html_viewer/weblayertreeview_impl.cc

Index: mojo/services/html_viewer/weblayertreeview_impl.cc
diff --git a/mojo/services/html_viewer/weblayertreeview_impl.cc b/mojo/services/html_viewer/weblayertreeview_impl.cc
index 5769982fd26f157850453b6bb7c408f3c92a81e2..c529dfed12bc20f0ebbef45fd071c6d0e20a93c5 100644
--- a/mojo/services/html_viewer/weblayertreeview_impl.cc
+++ b/mojo/services/html_viewer/weblayertreeview_impl.cc
@@ -36,11 +36,13 @@ WebLayerTreeViewImpl::WebLayerTreeViewImpl(
 
   cc::SharedBitmapManager* shared_bitmap_manager = NULL;
   gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager = NULL;
+  cc::TaskGraphRunner* task_graph_runner = NULL;

[jamesr, 2015/03/23 17:55:36]

these 3 should all be nullptr

does this being null mean that mojo html_viewer can't use any worker threads for
raster? what would need to be implemented for it to do so?

[reveman, 2015/03/23 18:39:46]

https://codereview.chromium.org/1023813004
Yes, we'd have to create a TaskGraphRunner instance and at least 1 worker thread
to process tasks. A simple example can be found in the
content/browser/compositor/gpu_process_transport_factory.cc change of this
patch.

We would also need a SharedBitmapManager and/or a GpuMemoryBufferManager
instance to perform non-GPU raster. SharedBitmaps for sw compositing,
GpuMemoryBuffer for hw compositing.

 
   layer_tree_host_ =
       cc::LayerTreeHost::CreateThreaded(this,
                                         shared_bitmap_manager,
                                         gpu_memory_buffer_manager,
+                                        task_graph_runner,
                                         settings,
                                         base::MessageLoopProxy::current(),
                                         compositor_message_loop_proxy,