Refactor gpu::Buffer to allow different types of backing

gpu/command_buffer/service/query_manager_unittest.cc

Index: gpu/command_buffer/service/query_manager_unittest.cc
diff --git a/gpu/command_buffer/service/query_manager_unittest.cc b/gpu/command_buffer/service/query_manager_unittest.cc
index b5f6609e634908c9fef51340a7d791e704ef3b6c..0acbbece1dacb5063b5314b7776cd069bef57e83 100644
--- a/gpu/command_buffer/service/query_manager_unittest.cc
+++ b/gpu/command_buffer/service/query_manager_unittest.cc
@@ -93,7 +93,8 @@ class QueryManagerTest : public testing::Test {
     MockCommandBufferEngine() {
       scoped_ptr<base::SharedMemory> shared_memory(new base::SharedMemory());
       shared_memory->CreateAndMapAnonymous(kSharedBufferSize);
-      valid_buffer_ = new gpu::Buffer(shared_memory.Pass(), kSharedBufferSize);
+      valid_buffer_ =
+          MakeBufferFromSharedMemory(shared_memory.Pass(), kSharedBufferSize);
       data_ = static_cast<uint8*>(valid_buffer_->memory());
       ClearSharedMemory();
     }