WIP GPU scheduler + delayed activation / tile draw

gpu/ipc/service/gpu_channel_manager.h

Index: gpu/ipc/service/gpu_channel_manager.h
diff --git a/gpu/ipc/service/gpu_channel_manager.h b/gpu/ipc/service/gpu_channel_manager.h
index 797dad1039489ef302cc37a86b450e334aae30e1..551ab499baa5d8cfbc4dc3c8a18531125158d826 100644
--- a/gpu/ipc/service/gpu_channel_manager.h
+++ b/gpu/ipc/service/gpu_channel_manager.h
@@ -56,6 +56,7 @@ struct ChannelHandle;
 namespace gpu {
 class GpuChannel;
 class GpuChannelManagerDelegate;
+class GpuScheduler;
 class GpuMemoryBufferFactory;
 class GpuWatchdogThread;
 
@@ -180,8 +181,11 @@ class GPU_EXPORT GpuChannelManager {
   base::WaitableEvent* shutdown_event_;
 
   scoped_refptr<gl::GLShareGroup> share_group_;
-  scoped_refptr<gles2::MailboxManager> mailbox_manager_;
+
   scoped_refptr<PreemptionFlag> preemption_flag_;
+  std::unique_ptr<GpuScheduler> scheduler_;
+
+  scoped_refptr<gles2::MailboxManager> mailbox_manager_;
   GpuMemoryManager gpu_memory_manager_;
   // SyncPointManager guaranteed to outlive running MessageLoop.
   SyncPointManager* sync_point_manager_;