Sample code: IPC Transport object for GPU

base/threading/thread_restrictions.h

Index: base/threading/thread_restrictions.h
diff --git a/base/threading/thread_restrictions.h b/base/threading/thread_restrictions.h
index 1b79c03b0823ba41606b7be4eac02fdda5ff6c83..0f639181fd19431ee7838084e1126f1a5d2d77c6 100644
--- a/base/threading/thread_restrictions.h
+++ b/base/threading/thread_restrictions.h
@@ -38,6 +38,7 @@ class BrowserGpuChannelHostFactory;
 class BrowserGpuMemoryBufferManager;
 class BrowserShutdownProfileDumper;
 class BrowserTestBase;
+class ChromeGpuChannelHostIPCTransport;
 class GpuChannelHost;
 class NestedMessagePumpAndroid;
 class ScopedAllowWaitForAndroidLayoutTests;
@@ -221,6 +222,7 @@ class BASE_EXPORT ThreadRestrictions {
       content::BrowserGpuChannelHostFactory;      // http://crbug.com/125248
   friend class
       content::BrowserGpuMemoryBufferManager;     // http://crbug.com/420368
+  friend class content::ChromeGpuChannelHostIPCTransport;
   friend class content::GpuChannelHost;           // http://crbug.com/125264
   friend class content::TextInputClientMac;       // http://crbug.com/121917
   friend class dbus::Bus;                         // http://crbug.com/125222