Chromium -> Mojo roll.

base/test/test_discardable_memory_allocator.h

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef BASE_TEST_TEST_DISCARDABLE_MEMORY_ALLOCATOR_H_
+#define BASE_TEST_TEST_DISCARDABLE_MEMORY_ALLOCATOR_H_
+
+#include "base/memory/discardable_memory_allocator.h"
+
+namespace base {
+
+// TestDiscardableMemoryAllocator is a simple DiscardableMemoryAllocator
+// implementation that can be used for testing. It allocates one-shot
+// DiscardableMemory instances backed by heap memory.
+class TestDiscardableMemoryAllocator : public DiscardableMemoryAllocator {
+ public:
+  TestDiscardableMemoryAllocator();
+  ~TestDiscardableMemoryAllocator() override;
+
+  // Overridden from DiscardableMemoryAllocator:
+  scoped_ptr<DiscardableMemory> AllocateLockedDiscardableMemory(
+      size_t size) override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(TestDiscardableMemoryAllocator);
+};
+
+}  // namespace base
+
+#endif  // BASE_TEST_TEST_DISCARDABLE_MEMORY_ALLOCATOR_H_