Do V8 GC ASAP if system memory is pressured

base/memory/memory_pressure_monitor_chromeos_unittest.cc

 // Copyright 2014 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.
 
 #include "base/memory/memory_pressure_monitor_chromeos.h"
 
 #include "base/macros.h"
 #include "base/memory/memory_pressure_listener.h"
 #include "base/message_loop/message_loop.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 59 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(TestMemoryPressureMonitor);
 };
 
 // This test tests the various transition states from memory pressure, looking
 // for the correct behavior on event reposting as well as state updates.
 TEST(ChromeOSMemoryPressureMonitorTest, CheckMemoryPressure) {
   base::MessageLoopForUI message_loop;
   std::unique_ptr<TestMemoryPressureMonitor> monitor(
       new TestMemoryPressureMonitor);
   std::unique_ptr<MemoryPressureListener> listener(
-      new MemoryPressureListener(base::Bind(&OnMemoryPressure)));
+      MemoryPressureListener::Create(base::Bind(&OnMemoryPressure)));
   // Checking the memory pressure while 0% are used should not produce any
   // events.
   monitor->SetMemoryInPercentOverride(0);
   ResetOnMemoryPressureCalled();
 
   monitor->CheckMemoryPressureForTest();
   message_loop.RunUntilIdle();
   EXPECT_FALSE(WasOnMemoryPressureCalled());
   EXPECT_EQ(MemoryPressureListener::MEMORY_PRESSURE_LEVEL_NONE,
             monitor->GetCurrentPressureLevel());
@@ skipping 66 matching lines @@
                 on_memory_pressure_level);
       break;
     }
   }
   // We should have needed exactly the same amount of checks as before.
   EXPECT_EQ(j, i);
 }
 
 }  // namespace chromeos
 }  // namespace base