{Browser}GpuMemoryBufferManager: add supported native attrib queries

gpu/command_buffer/client/gpu_memory_buffer_manager.cc

Index: gpu/command_buffer/client/gpu_memory_buffer_manager.cc
diff --git a/gpu/command_buffer/client/gpu_memory_buffer_manager.cc b/gpu/command_buffer/client/gpu_memory_buffer_manager.cc
index dbfa5936fef4cea842e5eef7d7c0351cec695584..079b962172426631d265aa4ae4b8369b1ad6c289 100644
--- a/gpu/command_buffer/client/gpu_memory_buffer_manager.cc
+++ b/gpu/command_buffer/client/gpu_memory_buffer_manager.cc
@@ -12,4 +12,9 @@ GpuMemoryBufferManager::GpuMemoryBufferManager() {
 GpuMemoryBufferManager::~GpuMemoryBufferManager() {
 }
 
+gfx::GpuMemoryBufferAttribVector
+GpuMemoryBufferManager::GetGpuMemoryBufferAttribs() {
+  return gfx::GpuMemoryBufferAttribVector();
+}
+
 }  // namespace gpu