cc: Add mailbox support to ResourceProvider write locks.

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 8983b5b0103156b55a2efb3cae7bca266456d6db..49dbc97aea475513ffd044cf63d9ed0844932a19 100644
--- a/cc/trees/layer_tree_host_impl.cc
+++ b/cc/trees/layer_tree_host_impl.cc
@@ -65,7 +65,6 @@
 #include "cc/quads/texture_draw_quad.h"
 #include "cc/raster/bitmap_raster_buffer_provider.h"
 #include "cc/raster/gpu_raster_buffer_provider.h"
-#include "cc/raster/gpu_rasterizer.h"
 #include "cc/raster/one_copy_raster_buffer_provider.h"
 #include "cc/raster/raster_buffer_provider.h"
 #include "cc/raster/synchronous_task_graph_runner.h"
@@ -2220,7 +2219,7 @@ void LayerTreeHostImpl::CreateResourceAndRasterBufferProvider(
     *raster_buffer_provider = base::MakeUnique<GpuRasterBufferProvider>(
         compositor_context_provider, worker_context_provider,
         resource_provider_.get(), settings_.use_distance_field_text,
-        msaa_sample_count);
+        msaa_sample_count, settings_.async_worker_context_enabled);
     return;
   }
 
@@ -2256,7 +2255,8 @@ void LayerTreeHostImpl::CreateResourceAndRasterBufferProvider(
       GetTaskRunner(), compositor_context_provider, worker_context_provider,
       resource_provider_.get(), max_copy_texture_chromium_size,
       settings_.use_partial_raster, settings_.max_staging_buffer_usage_in_bytes,
-      settings_.renderer_settings.preferred_tile_format);
+      settings_.renderer_settings.preferred_tile_format,
+      settings_.async_worker_context_enabled);
 }
 
 void LayerTreeHostImpl::SetLayerTreeMutator(LayerTreeMutator* mutator) {