(not for commit) Simplified multi-threaded Ganesh with lock on Flush only.

cc/surfaces/display.cc

Index: cc/surfaces/display.cc
diff --git a/cc/surfaces/display.cc b/cc/surfaces/display.cc
index ab1f0afcdf7790e08433b4d867c31a3d0c9eb9b4..d450200ac327996443d8d3bc0ee752da4ca7011d 100644
--- a/cc/surfaces/display.cc
+++ b/cc/surfaces/display.cc
@@ -80,7 +80,7 @@ void Display::InitializeRenderer() {
   scoped_ptr<ResourceProvider> resource_provider = ResourceProvider::Create(
       output_surface_.get(), bitmap_manager_, gpu_memory_buffer_manager_,
       blocking_main_thread_task_runner_.get(), settings_.highp_threshold_min,
-      settings_.use_rgba_4444_textures,
+      settings_.use_rgba_4444_textures, false,
       settings_.texture_id_allocation_chunk_size);
   if (!resource_provider)
     return;