gpu: Introduce GpuChannelEstablishFactory.

content/browser/compositor/gpu_process_transport_factory.h

Index: content/browser/compositor/gpu_process_transport_factory.h
diff --git a/content/browser/compositor/gpu_process_transport_factory.h b/content/browser/compositor/gpu_process_transport_factory.h
index de913bc148c5eb9ea4e0211854eba1d731750391..2f960d3fab20ef4232621bfc9d3016466e9e2927 100644
--- a/content/browser/compositor/gpu_process_transport_factory.h
+++ b/content/browser/compositor/gpu_process_transport_factory.h
@@ -79,6 +79,8 @@ class GpuProcessTransportFactory
   ui::ContextFactory* GetContextFactory() override;
   cc::SurfaceManager* GetSurfaceManager() override;
   display_compositor::GLHelper* GetGLHelper() override;
+  void SetGpuChannelEstablishFactory(
+      gpu::GpuChannelEstablishFactory* factory) override;
 #if defined(OS_MACOSX)
   void SetCompositorSuspendedForRecycle(ui::Compositor* compositor,
                                         bool suspended) override;
@@ -90,9 +92,11 @@ class GpuProcessTransportFactory
   PerCompositorData* CreatePerCompositorData(ui::Compositor* compositor);
   std::unique_ptr<cc::SoftwareOutputDevice> CreateSoftwareOutputDevice(
       ui::Compositor* compositor);
-  void EstablishedGpuChannel(base::WeakPtr<ui::Compositor> compositor,
-                             bool create_gpu_output_surface,
-                             int num_attempts);
+  void EstablishedGpuChannel(
+      base::WeakPtr<ui::Compositor> compositor,
+      bool create_gpu_output_surface,
+      int num_attempts,
+      scoped_refptr<gpu::GpuChannelHost> established_channel_host);
 
   void OnLostMainThreadSharedContextInsideCallback();
   void OnLostMainThreadSharedContext();
@@ -114,6 +118,8 @@ class GpuProcessTransportFactory
   scoped_refptr<cc::VulkanInProcessContextProvider>
       shared_vulkan_context_provider_;
 
+  gpu::GpuChannelEstablishFactory* gpu_channel_factory_ = nullptr;
+
 #if defined(OS_WIN)
   std::unique_ptr<OutputDeviceBacking> software_backing_;
 #endif