gpu: Introduce GpuChannelEstablishFactory.

content/public/browser/content_browser_client.h

Index: content/public/browser/content_browser_client.h
diff --git a/content/public/browser/content_browser_client.h b/content/public/browser/content_browser_client.h
index 1726f1a179f65c4dec88dc4298e85290897a4476..859691d452e9a8b9cd2ca3e4cc5e7411c8010109 100644
--- a/content/public/browser/content_browser_client.h
+++ b/content/public/browser/content_browser_client.h
@@ -56,6 +56,10 @@ namespace gfx {
 class ImageSkia;
 }
 
+namespace gpu {
+class GpuChannelEstablishFactory;
+}
+
 namespace media {
 class CdmFactory;
 }
@@ -571,6 +575,9 @@ class CONTENT_EXPORT ContentBrowserClient {
   virtual BrowserPpapiHost* GetExternalBrowserPpapiHost(
       int plugin_child_id);
 
+  // Gets the factory to use to establish a connection to the GPU process.
+  virtual gpu::GpuChannelEstablishFactory* GetGpuChannelEstablishFactory();
+
   // Returns true if the socket operation specified by |params| is allowed from
   // the given |browser_context| and |url|. If |params| is nullptr, this method
   // checks the basic "socket" permission, which is for those operations that