Add DiscardableMemoryAllocator to work around FD limit issue.

base/memory/scoped_vector_unittest.cc

 // Copyright (c) 2012 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/scoped_vector.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/memory/scoped_ptr.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 94 matching lines @@
 
 TEST(ScopedVectorTest, LifeCycleWatcher) {
   LifeCycleWatcher watcher;
   EXPECT_EQ(LC_INITIAL, watcher.life_cycle_state());
   LifeCycleObject* object = watcher.NewLifeCycleObject();
   EXPECT_EQ(LC_CONSTRUCTED, watcher.life_cycle_state());
   delete object;
   EXPECT_EQ(LC_DESTROYED, watcher.life_cycle_state());
 }
 
+TEST(ScopedVectorTest, PopBack) {
+  LifeCycleWatcher watcher;
+  EXPECT_EQ(LC_INITIAL, watcher.life_cycle_state());
+  ScopedVector<LifeCycleObject> scoped_vector;
+  scoped_vector.push_back(watcher.NewLifeCycleObject());
+  EXPECT_EQ(LC_CONSTRUCTED, watcher.life_cycle_state());
+  EXPECT_TRUE(watcher.IsWatching(scoped_vector.back()));
+  scoped_vector.pop_back();
+  EXPECT_EQ(LC_DESTROYED, watcher.life_cycle_state());
+  EXPECT_TRUE(scoped_vector.empty());
+}
+
 TEST(ScopedVectorTest, Clear) {
   LifeCycleWatcher watcher;
   EXPECT_EQ(LC_INITIAL, watcher.life_cycle_state());
   ScopedVector<LifeCycleObject> scoped_vector;
   scoped_vector.push_back(watcher.NewLifeCycleObject());
   EXPECT_EQ(LC_CONSTRUCTED, watcher.life_cycle_state());
   EXPECT_TRUE(watcher.IsWatching(scoped_vector.back()));
   scoped_vector.clear();
   EXPECT_EQ(LC_DESTROYED, watcher.life_cycle_state());
   EXPECT_TRUE(scoped_vector.empty());
@@ skipping 165 matching lines @@
   for(LifeCycleWatcher* it = watchers; it != watchers + 1; ++it)
     EXPECT_EQ(LC_CONSTRUCTED, it->life_cycle_state());
   for(LifeCycleWatcher* it = watchers + 1; it != watchers + 3; ++it)
     EXPECT_EQ(LC_DESTROYED, it->life_cycle_state());
   for(LifeCycleWatcher* it = watchers + 3; it != watchers + arraysize(watchers);
       ++it)
     EXPECT_EQ(LC_CONSTRUCTED, it->life_cycle_state());
 }
 
 }  // namespace