Write out CacheStorageCache size to index file.

content/browser/cache_storage/cache_storage_manager_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 "content/browser/cache_storage/cache_storage_manager.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
+#include <list>
 #include <set>
 #include <utility>
 
+#include "base/files/file_enumerator.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/guid.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/run_loop.h"
 #include "base/sha1.h"
 #include "base/stl_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "content/browser/blob_storage/chrome_blob_storage_context.h"
+#include "content/browser/cache_storage/cache_storage.h"
 #include "content/browser/cache_storage/cache_storage.pb.h"
 #include "content/browser/cache_storage/cache_storage_cache_handle.h"
+#include "content/browser/cache_storage/cache_storage_index.h"
 #include "content/browser/cache_storage/cache_storage_quota_client.h"
 #include "content/browser/quota/mock_quota_manager_proxy.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/cache_storage_usage_info.h"
 #include "content/public/browser/storage_partition.h"
 #include "content/public/test/mock_special_storage_policy.h"
 #include "content/public/test/test_browser_context.h"
 #include "content/public/test/test_browser_thread_bundle.h"
 #include "net/url_request/url_request_context.h"
 #include "net/url_request/url_request_context_getter.h"
 #include "net/url_request/url_request_job_factory_impl.h"
 #include "storage/browser/blob/blob_data_builder.h"
 #include "storage/browser/blob/blob_data_handle.h"
 #include "storage/browser/blob/blob_storage_context.h"
 #include "storage/browser/blob/blob_url_request_job_factory.h"
 #include "storage/browser/quota/quota_manager_proxy.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace content {
 
+namespace {
+
+bool IsIndexFileCurrent(const base::FilePath& cache_dir) {
+  base::File::Info info;
+  const base::FilePath index_path =
+      cache_dir.AppendASCII(CacheStorage::kIndexFileName);
+  if (!GetFileInfo(index_path, &info))
+    return false;
+  base::Time index_last_modified = info.last_modified;
+
+  base::FileEnumerator enumerator(cache_dir, false,
+                                  base::FileEnumerator::DIRECTORIES);
+  for (base::FilePath file_path = enumerator.Next(); !file_path.empty();
+       file_path = enumerator.Next()) {
+    if (!GetFileInfo(file_path, &info))
+      return false;
+    if (index_last_modified < info.last_modified)
+      return false;
+  }
+
+  return true;
+}
+
+}  // anonymous namespace
+
 // Returns a BlobProtocolHandler that uses |blob_storage_context|. Caller owns
 // the memory.
 std::unique_ptr<storage::BlobProtocolHandler> CreateMockBlobProtocolHandler(
     storage::BlobStorageContext* blob_storage_context) {
   // The FileSystemContext and thread task runner are not actually used but a
   // task runner is needed to avoid a DCHECK in BlobURLRequestJob ctor.
   return base::WrapUnique(new storage::BlobProtocolHandler(
       blob_storage_context, NULL, base::ThreadTaskRunnerHandle::Get().get()));
 }
 
 class CacheStorageManagerTest : public testing::Test {
  public:
   CacheStorageManagerTest()
       : browser_thread_bundle_(TestBrowserThreadBundle::IO_MAINLOOP),
         blob_storage_context_(nullptr),
         callback_bool_(false),
         callback_error_(CACHE_STORAGE_OK),
         origin1_("http://example1.com"),
         origin2_("http://example2.com") {}
 
   void SetUp() override {
+    base::FilePath temp_dir_path;
+    const bool is_incognito = MemoryOnly();

[jkarlin, 2016/12/14 14:19:56]

why this variable?

[cmumford, 2016/12/15 22:29:15]

It was in origin/master (and refactored). Removed it.

+    if (!is_incognito)
+      ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
+
+    CreateStorageManager();
+  }
+
+  void TearDown() override { DestroyStorageManager(); }
+
+  virtual bool MemoryOnly() { return false; }
+
+  void BoolAndErrorCallback(base::RunLoop* run_loop,
+                            bool value,
+                            CacheStorageError error) {
+    callback_bool_ = value;
+    callback_error_ = error;
+    run_loop->Quit();
+  }
+
+  void CacheAndErrorCallback(
+      base::RunLoop* run_loop,
+      std::unique_ptr<CacheStorageCacheHandle> cache_handle,
+      CacheStorageError error) {
+    callback_cache_handle_ = std::move(cache_handle);
+    callback_error_ = error;
+    run_loop->Quit();
+  }
+
+  void CacheMetadataCallback(base::RunLoop* run_loop,
+                             const CacheStorageIndex& cache_index) {
+    callback_cache_index_ = cache_index;
+    run_loop->Quit();
+  }
+
+  const std::string& GetFirstIndexName() const {
+    return callback_cache_index_.ordered_cache_metadata().front().name;
+  }
+
+  std::vector<std::string> GetIndexNames() const {
+    std::vector<std::string> cache_names;
+    for (const auto& metadata : callback_cache_index_.ordered_cache_metadata())
+      cache_names.push_back(metadata.name);
+    return cache_names;
+  }
+
+  void CachePutCallback(base::RunLoop* run_loop, CacheStorageError error) {
+    callback_error_ = error;
+    run_loop->Quit();
+  }
+
+  void CacheMatchCallback(
+      base::RunLoop* run_loop,
+      CacheStorageError error,
+      std::unique_ptr<ServiceWorkerResponse> response,
+      std::unique_ptr<storage::BlobDataHandle> blob_data_handle) {
+    callback_error_ = error;
+    callback_cache_handle_response_ = std::move(response);
+    callback_data_handle_ = std::move(blob_data_handle);
+    run_loop->Quit();
+  }
+
+  void CreateStorageManager() {
     ChromeBlobStorageContext* blob_storage_context(
         ChromeBlobStorageContext::GetFor(&browser_context_));
     // Wait for ChromeBlobStorageContext to finish initializing.
     base::RunLoop().RunUntilIdle();
 
     blob_storage_context_ = blob_storage_context->context();
 
     url_request_job_factory_.reset(new net::URLRequestJobFactoryImpl);
     url_request_job_factory_->SetProtocolHandler(
         "blob", CreateMockBlobProtocolHandler(blob_storage_context->context()));
 
     net::URLRequestContext* url_request_context =
-        BrowserContext::GetDefaultStoragePartition(&browser_context_)->
-              GetURLRequestContext()->GetURLRequestContext();
+        BrowserContext::GetDefaultStoragePartition(&browser_context_)
+            ->GetURLRequestContext()
+            ->GetURLRequestContext();

[jkarlin, 2016/12/14 14:19:56]

Huh, it seems strange that 'git cl format' would do this.

[cmumford, 2016/12/15 22:29:15]

Agreed - I manually reverted prior version.

 
     url_request_context->set_job_factory(url_request_job_factory_.get());
 
+    base::FilePath temp_dir_path;
     const bool is_incognito = MemoryOnly();

[jkarlin, 2016/12/14 14:19:56]

Ah, that's why. Please remove "is_incognito" here as well.

[cmumford, 2016/12/15 22:29:15]

Done.

-    base::FilePath temp_dir_path;
-    if (!is_incognito) {
-      ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
+    if (!is_incognito)
       temp_dir_path = temp_dir_.GetPath();
-    }
 
     quota_policy_ = new MockSpecialStoragePolicy;
     mock_quota_manager_ = new MockQuotaManager(
         is_incognito, temp_dir_path, base::ThreadTaskRunnerHandle::Get().get(),
         base::ThreadTaskRunnerHandle::Get().get(), quota_policy_.get());
     mock_quota_manager_->SetQuota(
         GURL(origin1_), storage::kStorageTypeTemporary, 1024 * 1024 * 100);
     mock_quota_manager_->SetQuota(
         GURL(origin2_), storage::kStorageTypeTemporary, 1024 * 1024 * 100);
 
     quota_manager_proxy_ = new MockQuotaManagerProxy(
         mock_quota_manager_.get(), base::ThreadTaskRunnerHandle::Get().get());
 
     cache_manager_ = CacheStorageManager::Create(
         temp_dir_path, base::ThreadTaskRunnerHandle::Get(),
         quota_manager_proxy_);
 
     cache_manager_->SetBlobParametersForCache(
-        BrowserContext::GetDefaultStoragePartition(&browser_context_)->
-            GetURLRequestContext(),
+        BrowserContext::GetDefaultStoragePartition(&browser_context_)
+            ->GetURLRequestContext(),
         blob_storage_context->context()->AsWeakPtr());
   }
 
-  void TearDown() override {
+  bool FlushCacheStorageIndex(const GURL& origin) {
+    bool write_scheduled =
+        CacheStorageForOrigin(origin)->InitiateScheduledIndexWriteForTest();
+    // Wait for write to complete.
+    base::RunLoop().RunUntilIdle();
+    return write_scheduled;
+  }
+
+  void DestroyStorageManager() {
     quota_manager_proxy_->SimulateQuotaManagerDestroyed();
     base::RunLoop().RunUntilIdle();
-  }
+    quota_manager_proxy_ = nullptr;
 
-  virtual bool MemoryOnly() { return false; }
+    url_request_job_factory_.reset();
+    blob_storage_context_ = nullptr;
 
-  void BoolAndErrorCallback(base::RunLoop* run_loop,
-                            bool value,
-                            CacheStorageError error) {
-    callback_bool_ = value;
-    callback_error_ = error;
-    run_loop->Quit();
-  }
+    quota_policy_ = nullptr;
+    mock_quota_manager_ = nullptr;
+    quota_manager_proxy_ = nullptr;
 
-  void CacheAndErrorCallback(
-      base::RunLoop* run_loop,
-      std::unique_ptr<CacheStorageCacheHandle> cache_handle,
-      CacheStorageError error) {
-    callback_cache_handle_ = std::move(cache_handle);
-    callback_error_ = error;
-    run_loop->Quit();
-  }
+    callback_cache_handle_ = nullptr;
+    callback_bool_ = false;
+    callback_cache_handle_response_ = nullptr;
+    callback_data_handle_ = nullptr;
+    callback_cache_index_ = CacheStorageIndex();
+    callback_all_origins_usage_.clear();
 
-  void StringsCallback(base::RunLoop* run_loop,
-                       const std::vector<std::string>& strings) {
-    callback_strings_ = strings;
-    run_loop->Quit();
-  }
-
-  void CachePutCallback(base::RunLoop* run_loop, CacheStorageError error) {
-    callback_error_ = error;
-    run_loop->Quit();
-  }
-
-  void CacheMatchCallback(
-      base::RunLoop* run_loop,
-      CacheStorageError error,
-      std::unique_ptr<ServiceWorkerResponse> response,
-      std::unique_ptr<storage::BlobDataHandle> blob_data_handle) {
-    callback_error_ = error;
-    callback_cache_handle_response_ = std::move(response);
-    callback_data_handle_ = std::move(blob_data_handle);
-    run_loop->Quit();
+    cache_manager_ = nullptr;
   }
 
   bool Open(const GURL& origin, const std::string& cache_name) {
     base::RunLoop loop;
     cache_manager_->OpenCache(
         origin, cache_name,
         base::Bind(&CacheStorageManagerTest::CacheAndErrorCallback,
                    base::Unretained(this), base::Unretained(&loop)));
     loop.Run();
 
@@ skipping 23 matching lines @@
         base::Bind(&CacheStorageManagerTest::BoolAndErrorCallback,
                    base::Unretained(this), base::Unretained(&loop)));
     loop.Run();
 
     return callback_bool_;
   }
 
   size_t Keys(const GURL& origin) {
     base::RunLoop loop;
     cache_manager_->EnumerateCaches(
-        origin, base::Bind(&CacheStorageManagerTest::StringsCallback,
+        origin, base::Bind(&CacheStorageManagerTest::CacheMetadataCallback,
                            base::Unretained(this), base::Unretained(&loop)));
     loop.Run();
-    return callback_strings_.size();
+    return callback_cache_index_.num_entries();
   }
 
   bool StorageMatch(const GURL& origin,
                     const std::string& cache_name,
                     const GURL& url,
                     const CacheStorageCacheQueryParams& match_params =
                         CacheStorageCacheQueryParams()) {
     ServiceWorkerFetchRequest request;
     request.url = url;
     return StorageMatchWithRequest(origin, cache_name, request, match_params);
@@ skipping 171 matching lines @@
   scoped_refptr<MockSpecialStoragePolicy> quota_policy_;
   scoped_refptr<MockQuotaManager> mock_quota_manager_;
   scoped_refptr<MockQuotaManagerProxy> quota_manager_proxy_;
   std::unique_ptr<CacheStorageManager> cache_manager_;
 
   std::unique_ptr<CacheStorageCacheHandle> callback_cache_handle_;
   int callback_bool_;
   CacheStorageError callback_error_;
   std::unique_ptr<ServiceWorkerResponse> callback_cache_handle_response_;
   std::unique_ptr<storage::BlobDataHandle> callback_data_handle_;
-  std::vector<std::string> callback_strings_;
+  CacheStorageIndex callback_cache_index_;
 
   const GURL origin1_;
   const GURL origin2_;
 
   int64_t callback_usage_;
   std::vector<CacheStorageUsageInfo> callback_all_origins_usage_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(CacheStorageManagerTest);
 };
@@ skipping 92 matching lines @@
 }
 
 TEST_P(CacheStorageManagerTestP, SomeKeys) {
   EXPECT_TRUE(Open(origin1_, "foo"));
   EXPECT_TRUE(Open(origin1_, "bar"));
   EXPECT_TRUE(Open(origin2_, "baz"));
   EXPECT_EQ(2u, Keys(origin1_));
   std::vector<std::string> expected_keys;
   expected_keys.push_back("foo");
   expected_keys.push_back("bar");
-  EXPECT_EQ(expected_keys, callback_strings_);
+  EXPECT_EQ(expected_keys, GetIndexNames());
   EXPECT_EQ(1u, Keys(origin2_));
-  EXPECT_STREQ("baz", callback_strings_[0].c_str());
+  EXPECT_STREQ("baz", GetFirstIndexName().c_str());
 }
 
 TEST_P(CacheStorageManagerTestP, DeletedKeysGone) {
   EXPECT_TRUE(Open(origin1_, "foo"));
   EXPECT_TRUE(Open(origin1_, "bar"));
   EXPECT_TRUE(Open(origin2_, "baz"));
   EXPECT_TRUE(Delete(origin1_, "bar"));
   EXPECT_EQ(1u, Keys(origin1_));
-  EXPECT_STREQ("foo", callback_strings_[0].c_str());
+  EXPECT_STREQ("foo", GetFirstIndexName().c_str());
 }
 
 TEST_P(CacheStorageManagerTestP, StorageMatchEntryExists) {
   EXPECT_TRUE(Open(origin1_, "foo"));
   EXPECT_TRUE(CachePut(callback_cache_handle_->value(),
                        GURL("http://example.com/foo")));
   EXPECT_TRUE(StorageMatch(origin1_, "foo", GURL("http://example.com/foo")));
 }
 
 TEST_P(CacheStorageManagerTestP, StorageMatchNoEntry) {
@@ skipping 125 matching lines @@
   EXPECT_TRUE(StorageMatchAll(origin1_, GURL("http://example.com/foo")));
 }
 
 TEST_P(CacheStorageManagerTestP, Chinese) {
   EXPECT_TRUE(Open(origin1_, "你好"));
   std::unique_ptr<CacheStorageCacheHandle> cache_handle =
       std::move(callback_cache_handle_);
   EXPECT_TRUE(Open(origin1_, "你好"));
   EXPECT_EQ(callback_cache_handle_->value(), cache_handle->value());
   EXPECT_EQ(1u, Keys(origin1_));
-  EXPECT_STREQ("你好", callback_strings_[0].c_str());
+  EXPECT_STREQ("你好", GetFirstIndexName().c_str());
 }
 
 TEST_F(CacheStorageManagerTest, EmptyKey) {
   EXPECT_TRUE(Open(origin1_, ""));
   std::unique_ptr<CacheStorageCacheHandle> cache_handle =
       std::move(callback_cache_handle_);
   EXPECT_TRUE(Open(origin1_, ""));
   EXPECT_EQ(cache_handle->value(), callback_cache_handle_->value());
   EXPECT_EQ(1u, Keys(origin1_));
-  EXPECT_STREQ("", callback_strings_[0].c_str());
+  EXPECT_STREQ("", GetFirstIndexName().c_str());
   EXPECT_TRUE(Has(origin1_, ""));
   EXPECT_TRUE(Delete(origin1_, ""));
   EXPECT_EQ(0u, Keys(origin1_));
 }
 
 TEST_F(CacheStorageManagerTest, DataPersists) {
   EXPECT_TRUE(Open(origin1_, "foo"));
   EXPECT_TRUE(Open(origin1_, "bar"));
   EXPECT_TRUE(Open(origin1_, "baz"));
   EXPECT_TRUE(Open(origin2_, "raz"));
   EXPECT_TRUE(Delete(origin1_, "bar"));
   quota_manager_proxy_->SimulateQuotaManagerDestroyed();
   cache_manager_ = CacheStorageManager::Create(cache_manager_.get());
   EXPECT_EQ(2u, Keys(origin1_));
   std::vector<std::string> expected_keys;
   expected_keys.push_back("foo");
   expected_keys.push_back("baz");
-  EXPECT_EQ(expected_keys, callback_strings_);
+  EXPECT_EQ(expected_keys, GetIndexNames());
 }
 
 TEST_F(CacheStorageManagerMemoryOnlyTest, DataLostWhenMemoryOnly) {
   EXPECT_TRUE(Open(origin1_, "foo"));
   EXPECT_TRUE(Open(origin2_, "baz"));
   quota_manager_proxy_->SimulateQuotaManagerDestroyed();
   cache_manager_ = CacheStorageManager::Create(cache_manager_.get());
   EXPECT_EQ(0u, Keys(origin1_));
 }
 
 TEST_F(CacheStorageManagerTest, BadCacheName) {
   // Since the implementation writes cache names to disk, ensure that we don't
   // escape the directory.
   const std::string bad_name = "../../../../../../../../../../../../../../foo";
   EXPECT_TRUE(Open(origin1_, bad_name));
   EXPECT_EQ(1u, Keys(origin1_));
-  EXPECT_STREQ(bad_name.c_str(), callback_strings_[0].c_str());
+  EXPECT_STREQ(bad_name.c_str(), GetFirstIndexName().c_str());
 }
 
 TEST_F(CacheStorageManagerTest, BadOriginName) {
   // Since the implementation writes origin names to disk, ensure that we don't
   // escape the directory.
   GURL bad_origin("http://../../../../../../../../../../../../../../foo");
   EXPECT_TRUE(Open(bad_origin, "foo"));
   EXPECT_EQ(1u, Keys(bad_origin));
-  EXPECT_STREQ("foo", callback_strings_[0].c_str());
+  EXPECT_STREQ("foo", GetFirstIndexName().c_str());
 }
 
 // With a persistent cache if the client drops its reference to a
 // CacheStorageCache it should be deleted.
 TEST_F(CacheStorageManagerTest, DropReference) {
   EXPECT_TRUE(Open(origin1_, "foo"));
   base::WeakPtr<CacheStorageCache> cache =
       callback_cache_handle_->value()->AsWeakPtr();
   // Run a cache operation to ensure that the cache has finished initializing so
   // that when the handle is dropped it can close immediately.
@@ skipping 122 matching lines @@
 
   if (MemoryOnly()) {
     EXPECT_TRUE(usage[origin1_index].last_modified.is_null());
     EXPECT_TRUE(usage[origin2_index].last_modified.is_null());
   } else {
     EXPECT_FALSE(usage[origin1_index].last_modified.is_null());
     EXPECT_FALSE(usage[origin2_index].last_modified.is_null());
   }
 }
 
+TEST_F(CacheStorageManagerTest, GetAllOriginsUsageWithOldIndex) {

[jkarlin, 2016/12/14 14:19:56]

Add a simple test to show the expected case, e.g., add a resource, get its size,
close the manager, reopen the manager, and the size is correct.

[cmumford, 2016/12/15 22:29:15]

Done - added CacheSizeCorrectAfterReopen.

+  // Write a single value (V1) to the cache.
+  const GURL kFooURL = origin1_.Resolve("foo");
+  const std::string kCacheName = "foo";
+  EXPECT_TRUE(Open(origin1_, kCacheName));
+  std::unique_ptr<CacheStorageCacheHandle> original_handle =
+      std::move(callback_cache_handle_);
+
+  EXPECT_TRUE(CachePut(original_handle->value(), kFooURL));
+  int64_t cache_size_v1 = Size(origin1_);
+  base::FilePath storage_dir = original_handle->value()->path().DirName();
+  original_handle.release();
+  EXPECT_GE(cache_size_v1, 0);
+
+  // Close the caches and cache manager.
+  EXPECT_TRUE(FlushCacheStorageIndex(origin1_));
+  DestroyStorageManager();
+
+  // Save a copy of the V1 index.
+  EXPECT_TRUE(IsIndexFileCurrent(storage_dir));
+  base::FilePath index_path = storage_dir.AppendASCII("index.txt");
+  EXPECT_TRUE(base::PathExists(index_path));
+  base::FilePath backup_index_path = storage_dir.AppendASCII("index.txt.bak");
+  EXPECT_TRUE(base::CopyFile(index_path, backup_index_path));
+
+  // Create a new CacheStorageManager that hasn't yet loaded the origin.
+  CreateStorageManager();
+  quota_manager_proxy_->SimulateQuotaManagerDestroyed();
+  cache_manager_ = CacheStorageManager::Create(cache_manager_.get());
+
+  // Create a second value (V2) in the cache.
+  EXPECT_TRUE(Open(origin1_, kCacheName));
+  original_handle = std::move(callback_cache_handle_);
+  const GURL kBarURL = origin1_.Resolve("bar");
+  EXPECT_TRUE(CachePut(original_handle->value(), kBarURL));
+  original_handle.release();
+
+  std::vector<CacheStorageUsageInfo> usage = GetAllOriginsUsage();
+  ASSERT_EQ(1ULL, usage.size());
+  int64_t usage_before_close = usage[0].total_size_bytes;
+  EXPECT_GT(usage_before_close, 0);
+
+  // Close the caches and cache manager.
+  DestroyStorageManager();
+
+  // Restore the index to the V1 state. Make the access/mod times of index file
+  // older than the other directories in the store to trigger size
+  // recalculation.
+  EXPECT_TRUE(base::CopyFile(backup_index_path, index_path));
+  base::Time t = base::Time::Now() - base::TimeDelta::FromHours(1);
+  EXPECT_TRUE(base::TouchFile(index_path, t, t));
+  EXPECT_FALSE(IsIndexFileCurrent(storage_dir));
+
+  CreateStorageManager();
+  usage = GetAllOriginsUsage();
+  ASSERT_EQ(1ULL, usage.size());
+
+  EXPECT_EQ(usage_before_close, usage[0].total_size_bytes);
+
+  EXPECT_FALSE(usage[0].last_modified.is_null());
+}
+
+TEST_F(CacheStorageManagerTest, GetOriginSizeWithOldIndex) {
+  // Write a single value (V1) to the cache.
+  const GURL kFooURL = origin1_.Resolve("foo");
+  const std::string kCacheName = "foo";
+  EXPECT_TRUE(Open(origin1_, kCacheName));
+  std::unique_ptr<CacheStorageCacheHandle> original_handle =
+      std::move(callback_cache_handle_);
+
+  EXPECT_TRUE(CachePut(original_handle->value(), kFooURL));
+  int64_t cache_size_v1 = Size(origin1_);
+  base::FilePath storage_dir = original_handle->value()->path().DirName();
+  original_handle.release();
+  EXPECT_GE(cache_size_v1, 0);
+
+  // Close the caches and cache manager.
+  EXPECT_TRUE(FlushCacheStorageIndex(origin1_));
+  DestroyStorageManager();
+
+  // Save a copy of the V1 index.
+  EXPECT_TRUE(IsIndexFileCurrent(storage_dir));
+  base::FilePath index_path = storage_dir.AppendASCII("index.txt");
+  EXPECT_TRUE(base::PathExists(index_path));
+  base::FilePath backup_index_path = storage_dir.AppendASCII("index.txt.bak");
+  EXPECT_TRUE(base::CopyFile(index_path, backup_index_path));
+
+  // Create a new CacheStorageManager that hasn't yet loaded the origin.
+  CreateStorageManager();
+  quota_manager_proxy_->SimulateQuotaManagerDestroyed();
+  cache_manager_ = CacheStorageManager::Create(cache_manager_.get());
+
+  // Reopen the cache and write a second value (V2).
+  EXPECT_TRUE(Open(origin1_, kCacheName));
+  original_handle = std::move(callback_cache_handle_);
+  const GURL kBarURL = origin1_.Resolve("bar");
+  EXPECT_TRUE(CachePut(original_handle->value(), kBarURL));
+  original_handle.release();
+  int64_t cache_size_v2 = Size(origin1_);
+  EXPECT_GE(cache_size_v2, 0);
+
+  // Close the caches and cache manager.
+  DestroyStorageManager();
+
+  // Restore the index to the V1 state.
+  EXPECT_TRUE(base::CopyFile(backup_index_path, index_path));
+
+  // Make the access/mod times of index file older than the other files in the
+  // cache to trigger size recalculation.
+  base::Time t = base::Time::Now() - base::TimeDelta::FromHours(1);
+  EXPECT_TRUE(base::TouchFile(index_path, t, t));
+  EXPECT_FALSE(IsIndexFileCurrent(storage_dir));
+
+  // Reopen the cache and ensure the size is correct for the V2 value.
+  CreateStorageManager();
+  EXPECT_TRUE(Open(origin1_, kCacheName));
+  EXPECT_EQ(cache_size_v2, Size(origin1_));
+}
+
 TEST_P(CacheStorageManagerTestP, GetSizeThenCloseAllCaches) {
   EXPECT_TRUE(Open(origin1_, "foo"));
   EXPECT_TRUE(CachePut(callback_cache_handle_->value(),
                        GURL("http://example.com/foo")));
   EXPECT_TRUE(CachePut(callback_cache_handle_->value(),
                        GURL("http://example.com/foo2")));
   EXPECT_TRUE(Open(origin1_, "bar"));
   EXPECT_TRUE(CachePut(callback_cache_handle_->value(),
                        GURL("http://example.com/bar")));
 
@@ skipping 364 matching lines @@
 
 INSTANTIATE_TEST_CASE_P(CacheStorageManagerTests,
                         CacheStorageManagerTestP,
                         ::testing::Values(false, true));
 
 INSTANTIATE_TEST_CASE_P(CacheStorageQuotaClientTests,
                         CacheStorageQuotaClientTestP,
                         ::testing::Values(false, true));
 
 }  // namespace content