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

ui/message_center/test/run_all_unittests.cc

Index: ui/message_center/test/run_all_unittests.cc
diff --git a/ui/message_center/test/run_all_unittests.cc b/ui/message_center/test/run_all_unittests.cc
index fa53d67492a44182ab62da53b46362ab1a98aca6..b0cc026cc1b160deaae29bbbbb85a03cb806e302 100644
--- a/ui/message_center/test/run_all_unittests.cc
+++ b/ui/message_center/test/run_all_unittests.cc
@@ -7,6 +7,7 @@
 #include "base/compiler_specific.h"
 #include "base/path_service.h"
 #include "base/test/launcher/unit_test_launcher.h"
+#include "base/test/test_discardable_memory_shmem_allocator.h"
 #include "base/test/test_suite.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/base/resource/resource_bundle.h"
@@ -37,6 +38,9 @@ class MessageCenterTestSuite : public base::TestSuite {
     base::FilePath ui_test_pak_path;
     ASSERT_TRUE(PathService::Get(ui::UI_TEST_PAK, &ui_test_pak_path));
     ui::ResourceBundle::InitSharedInstanceWithPakPath(ui_test_pak_path);
+
+    base::DiscardableMemoryShmemAllocator::SetInstance(
+        &discardable_memory_allocator_);
   }
 
   void Shutdown() override {
@@ -45,6 +49,8 @@ class MessageCenterTestSuite : public base::TestSuite {
   }
 
  private:
+  base::TestDiscardableMemoryShmemAllocator discardable_memory_allocator_;
+
   DISALLOW_COPY_AND_ASSIGN(MessageCenterTestSuite);
 };