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

ash/test/test_suite.h

Index: ash/test/test_suite.h
diff --git a/ash/test/test_suite.h b/ash/test/test_suite.h
index 33fcd23e146bc8c03f975f17d279d85cb0cb5a90..e2e0957dc3d632619deaeb1a3f23fa710c489c1b 100644
--- a/ash/test/test_suite.h
+++ b/ash/test/test_suite.h
@@ -6,6 +6,7 @@
 #define ASH_TEST_TEST_SUITE_H_
 
 #include "base/compiler_specific.h"
+#include "base/test/test_discardable_memory_shmem_allocator.h"
 #include "base/test/test_suite.h"
 
 #if defined(OS_WIN)
@@ -29,6 +30,8 @@ class AuraShellTestSuite : public base::TestSuite {
 #if defined(OS_WIN)
   scoped_ptr<base::win::ScopedCOMInitializer> com_initializer_;
 #endif
+
+  base::TestDiscardableMemoryShmemAllocator discardable_memory_allocator_;
 };
 
 }  // namespace test