Revert of Revert of content: Fix single process support for native GpuMemoryBuffers.

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 3993e51e627f8a3bea7688143efb9b4d66657719..a9ed8b956c665d0be7fe80ab72fbc330233be654 100644
--- a/content/gpu/gpu_child_thread.h
+++ b/content/gpu/gpu_child_thread.h
@@ -44,9 +44,12 @@
                  const DeferredMessages& deferred_messages,
                  GpuMemoryBufferFactory* gpu_memory_buffer_factory);
 
-  explicit GpuChildThread(const InProcessChildThreadParams& params);
+  GpuChildThread(const InProcessChildThreadParams& params,
+                 GpuMemoryBufferFactory* gpu_memory_buffer_factory);
 
   ~GpuChildThread() override;
+
+  static gfx::GpuMemoryBufferType GetGpuMemoryBufferFactoryType();
 
   void Shutdown() override;