Re-land: base: Implement browser process support for discardable memory.

chrome/test/base/chrome_unit_test_suite.h

 // Copyright 2013 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 CHROME_TEST_BASE_CHROME_UNIT_TEST_SUITE_H_
 #define CHROME_TEST_BASE_CHROME_UNIT_TEST_SUITE_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/files/file_path.h"
+#include "base/test/test_discardable_memory_shmem_allocator.h"
 #include "chrome/test/base/chrome_test_suite.h"
 
 // Test suite for unit tests. Creates additional stub services that are not
 // needed for browser tests (e.g. a TestingBrowserProcess).
 class ChromeUnitTestSuite : public ChromeTestSuite {
  public:
   ChromeUnitTestSuite(int argc, char** argv);
   ~ChromeUnitTestSuite() override;
 
   // base::TestSuite overrides:
   void Initialize() override;
   void Shutdown() override;
 
   // These methods allow unit tests which run in the browser_test binary, and so
   // which don't exercise the initialization in this test suite, to do basic
   // setup which this class does.
   static void InitializeProviders();
   static void InitializeResourceBundle();
 
  private:
+  base::TestDiscardableMemoryShmemAllocator discardable_memory_allocator_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeUnitTestSuite);
 };
 
 #endif  // CHROME_TEST_BASE_CHROME_UNIT_TEST_SUITE_H_