Revert of Move content's shell connections to the IO thread

content/gpu/gpu_child_thread.h

Index: content/gpu/gpu_child_thread.h
diff --git a/content/gpu/gpu_child_thread.h b/content/gpu/gpu_child_thread.h
index 7eb8c4629f482049a007c183b2356e7e18973fff..f51bba18b6a86bf222a1e53b6100a4150a5f1821 100644
--- a/content/gpu/gpu_child_thread.h
+++ b/content/gpu/gpu_child_thread.h
@@ -28,6 +28,7 @@
 #include "gpu/ipc/service/gpu_config.h"
 #include "gpu/ipc/service/x_util.h"
 #include "mojo/public/cpp/bindings/binding_set.h"
+#include "mojo/public/cpp/bindings/interface_request.h"
 #include "ui/gfx/native_widget_types.h"
 
 namespace gpu {
@@ -86,6 +87,9 @@
   bool Send(IPC::Message* msg) override;
   bool OnControlMessageReceived(const IPC::Message& msg) override;
   bool OnMessageReceived(const IPC::Message& msg) override;
+  bool OnConnect(shell::Connection* connection) override;
+  shell::InterfaceRegistry* GetInterfaceRegistryForConnection() override;
+  shell::InterfaceProvider* GetInterfaceProviderForConnection() override;
 
   // gpu::GpuChannelManagerDelegate:
   void SetActiveURL(const GURL& url) override;
@@ -134,7 +138,8 @@
 #endif
   void OnLoseAllContexts();
 
-  void BindProcessControlRequest(mojom::ProcessControlRequest request);
+  void BindProcessControlRequest(
+      mojo::InterfaceRequest<mojom::ProcessControl> request);
 
   gpu::GpuPreferences gpu_preferences_;
 
@@ -174,6 +179,8 @@
   // Bindings to the mojom::ProcessControl impl.
   mojo::BindingSet<mojom::ProcessControl> process_control_bindings_;
 
+  base::Closure resume_interface_bindings_callback_;
+
   DISALLOW_COPY_AND_ASSIGN(GpuChildThread);
 };