Implement TransformFeedbackManager in GPU command buffer.

gpu/command_buffer/service/buffer_manager.h

Index: gpu/command_buffer/service/buffer_manager.h
diff --git a/gpu/command_buffer/service/buffer_manager.h b/gpu/command_buffer/service/buffer_manager.h
index 59547229f7a64d1ca05310ad934420525fd5e037..f2bc9e55a78f7526bbbd5a504de5629ac9897d41 100644
--- a/gpu/command_buffer/service/buffer_manager.h
+++ b/gpu/command_buffer/service/buffer_manager.h
@@ -293,6 +293,7 @@ class GPU_EXPORT BufferManager : public base::trace_event::MemoryDumpProvider {
   friend class Buffer;
   friend class TestHelper;  // Needs access to DoBufferData.
   friend class BufferManagerTestBase;  // Needs access to DoBufferSubData.
+  friend class IndexedBufferBindingHostTest;  // Needs access to SetInfo.
 
   void StartTracking(Buffer* buffer);
   void StopTracking(Buffer* buffer);