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 de626f92a5bd82dcb71b2d2b203c35c984d3f538..f51bba18b6a86bf222a1e53b6100a4150a5f1821 100644
--- a/content/gpu/gpu_child_thread.h
+++ b/content/gpu/gpu_child_thread.h
@@ -19,6 +19,7 @@
 #include "base/time/time.h"
 #include "build/build_config.h"
 #include "content/child/child_thread_impl.h"
+#include "content/common/process_control.mojom.h"
 #include "gpu/command_buffer/service/gpu_preferences.h"
 #include "gpu/config/gpu_info.h"
 #include "gpu/ipc/service/gpu_channel.h"
@@ -26,6 +27,8 @@
 #include "gpu/ipc/service/gpu_channel_manager_delegate.h"
 #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 {
@@ -42,6 +45,7 @@
 }
 
 namespace content {
+class GpuProcessControlImpl;
 class GpuWatchdogThread;
 struct EstablishChannelParams;
 
@@ -80,10 +84,12 @@
 
  private:
   // ChildThreadImpl:.
-  void AddConnectionFilters(MojoShellConnection* connection) override;
   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;
@@ -132,6 +138,9 @@
 #endif
   void OnLoseAllContexts();
 
+  void BindProcessControlRequest(
+      mojo::InterfaceRequest<mojom::ProcessControl> request);
+
   gpu::GpuPreferences gpu_preferences_;
 
   // Set this flag to true if a fatal error occurred before we receive the
@@ -164,6 +173,14 @@
   // The gpu::GpuMemoryBufferFactory instance used to allocate GpuMemoryBuffers.
   gpu::GpuMemoryBufferFactory* const gpu_memory_buffer_factory_;
 
+  // Process control for Mojo application hosting.
+  std::unique_ptr<GpuProcessControlImpl> process_control_;
+
+  // Bindings to the mojom::ProcessControl impl.
+  mojo::BindingSet<mojom::ProcessControl> process_control_bindings_;
+
+  base::Closure resume_interface_bindings_callback_;
+
   DISALLOW_COPY_AND_ASSIGN(GpuChildThread);
 };