[tracing] Add a memory dump provider for DOM storage

content/browser/dom_storage/dom_storage_context_impl_unittest.cc

 // 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.
 
 #include "base/bind.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 33 matching lines @@
     ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
     storage_policy_ = new MockSpecialStoragePolicy;
     task_runner_ =
         new MockDOMStorageTaskRunner(base::ThreadTaskRunnerHandle::Get().get());
     context_ = new DOMStorageContextImpl(temp_dir_.path(),
                                          base::FilePath(),
                                          storage_policy_.get(),
                                          task_runner_.get());
   }
 
-  void TearDown() override { base::MessageLoop::current()->RunUntilIdle(); }
+  void TearDown() override {
+    if (context_)
+      context_->Shutdown();
+    base::MessageLoop::current()->RunUntilIdle();
+  }
 
   void VerifySingleOriginRemains(const GURL& origin) {
     // Use a new instance to examine the contexts of temp_dir_.
     scoped_refptr<DOMStorageContextImpl> context =
         new DOMStorageContextImpl(temp_dir_.path(), base::FilePath(),
                                   NULL, NULL);
     std::vector<LocalStorageUsageInfo> infos;
     context->GetLocalStorageUsage(&infos, kDontIncludeFileInfo);
     ASSERT_EQ(1u, infos.size());
     EXPECT_EQ(origin, infos[0].origin);
+    context->Shutdown();
   }
 
   int session_id_offset() { return context_->session_id_offset_; }
 
  protected:
   base::MessageLoop message_loop_;
   base::ScopedTempDir temp_dir_;
   scoped_refptr<MockSpecialStoragePolicy> storage_policy_;
   scoped_refptr<MockDOMStorageTaskRunner> task_runner_;
   scoped_refptr<DOMStorageContextImpl> context_;
@@ skipping 113 matching lines @@
   ASSERT_TRUE(dom_namespace);
   EXPECT_EQ(kClonedPersistentId,
             cloned_dom_namespace->persistent_namespace_id());
   // Verify that the areas inherit the persistent ID.
   DOMStorageArea* cloned_area = cloned_dom_namespace->OpenStorageArea(kOrigin);
   EXPECT_EQ(kClonedPersistentId, cloned_area->persistent_namespace_id_);
 }
 
 TEST_F(DOMStorageContextImplTest, DeleteSessionStorage) {
   // Create a DOMStorageContextImpl which will save sessionStorage on disk.
+  context_->Shutdown();
   context_ = new DOMStorageContextImpl(temp_dir_.path(),
                                        temp_dir_.path(),
                                        storage_policy_.get(),
                                        task_runner_.get());
   context_->SetSaveSessionStorageOnDisk();
   ASSERT_EQ(temp_dir_.path(), context_->sessionstorage_directory());
 
   // Write data.
   const int kSessionStorageNamespaceId = 1 + session_id_offset();
   const std::string kPersistentId = "persistent";
@@ skipping 48 matching lines @@
   area = dom_namespace->OpenStorageArea(kOrigin);
   read_value = area->GetItem(kKey);
   EXPECT_TRUE(read_value.is_null());
   dom_namespace->CloseStorageArea(area);
   context_->Shutdown();
   context_ = NULL;
   base::MessageLoop::current()->RunUntilIdle();
 }
 
 }  // namespace content