Move FileAPI sandboxed filesystem related code from webkit/fileapi to webkit/browser/fileapi

webkit/fileapi/sandbox_mount_point_provider.cc

Index: webkit/fileapi/sandbox_mount_point_provider.cc
diff --git a/webkit/fileapi/sandbox_mount_point_provider.cc b/webkit/fileapi/sandbox_mount_point_provider.cc
deleted file mode 100644
index 13f0902a76ba843e9fe6cd2c108078451679c169..0000000000000000000000000000000000000000
--- a/webkit/fileapi/sandbox_mount_point_provider.cc
+++ /dev/null
@@ -1,700 +0,0 @@
-// 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 "webkit/fileapi/sandbox_mount_point_provider.h"
-
-#include "base/bind.h"
-#include "base/command_line.h"
-#include "base/file_util.h"
-#include "base/logging.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/metrics/histogram.h"
-#include "base/stl_util.h"
-#include "base/task_runner_util.h"
-#include "googleurl/src/gurl.h"
-#include "net/base/net_util.h"
-#include "webkit/browser/fileapi/file_system_usage_cache.h"
-#include "webkit/fileapi/async_file_util_adapter.h"
-#include "webkit/fileapi/copy_or_move_file_validator.h"
-#include "webkit/fileapi/file_system_context.h"
-#include "webkit/fileapi/file_system_file_stream_reader.h"
-#include "webkit/fileapi/file_system_operation_context.h"
-#include "webkit/fileapi/file_system_options.h"
-#include "webkit/fileapi/file_system_task_runners.h"
-#include "webkit/fileapi/file_system_types.h"
-#include "webkit/fileapi/file_system_util.h"
-#include "webkit/fileapi/local_file_system_operation.h"
-#include "webkit/fileapi/obfuscated_file_util.h"
-#include "webkit/fileapi/sandbox_file_stream_writer.h"
-#include "webkit/fileapi/sandbox_quota_observer.h"
-#include "webkit/fileapi/syncable/syncable_file_system_operation.h"
-#include "webkit/quota/quota_manager.h"
-
-using quota::QuotaManagerProxy;
-
-namespace fileapi {
-
-namespace {
-
-const char kChromeScheme[] = "chrome";
-const char kExtensionScheme[] = "chrome-extension";
-
-const char kOpenFileSystemLabel[] = "FileSystem.OpenFileSystem";
-const char kOpenFileSystemDetailLabel[] = "FileSystem.OpenFileSystemDetail";
-const char kOpenFileSystemDetailNonThrottledLabel[] =
-    "FileSystem.OpenFileSystemDetailNonthrottled";
-int64 kMinimumStatsCollectionIntervalHours = 1;
-
-// A command line switch to disable usage tracking.
-const char kDisableUsageTracking[] = "disable-file-system-usage-tracking";
-
-enum FileSystemError {
-  kOK = 0,
-  kIncognito,
-  kInvalidSchemeError,
-  kCreateDirectoryError,
-  kNotFound,
-  kUnknownError,
-  kFileSystemErrorMax,
-};
-
-const char kTemporaryOriginsCountLabel[] = "FileSystem.TemporaryOriginsCount";
-const char kPersistentOriginsCountLabel[] = "FileSystem.PersistentOriginsCount";
-const char kSyncableOriginsCountLabel[] = "FileSystem.SyncableOriginsCount";
-
-// Restricted names.
-// http://dev.w3.org/2009/dap/file-system/file-dir-sys.html#naming-restrictions
-const base::FilePath::CharType* const kRestrictedNames[] = {
-  FILE_PATH_LITERAL("."), FILE_PATH_LITERAL(".."),
-};
-
-// Restricted chars.
-const base::FilePath::CharType kRestrictedChars[] = {
-  FILE_PATH_LITERAL('/'), FILE_PATH_LITERAL('\\'),
-};
-
-class ObfuscatedOriginEnumerator
-    : public SandboxMountPointProvider::OriginEnumerator {
- public:
-  explicit ObfuscatedOriginEnumerator(ObfuscatedFileUtil* file_util) {
-    enum_.reset(file_util->CreateOriginEnumerator());
-  }
-  virtual ~ObfuscatedOriginEnumerator() {}
-
-  virtual GURL Next() OVERRIDE {
-    return enum_->Next();
-  }
-
-  virtual bool HasFileSystemType(fileapi::FileSystemType type) const OVERRIDE {
-    return enum_->HasFileSystemType(type);
-  }
-
- private:
-  scoped_ptr<ObfuscatedFileUtil::AbstractOriginEnumerator> enum_;
-};
-
-void DidValidateFileSystemRoot(
-    base::WeakPtr<SandboxMountPointProvider> mount_point_provider,
-    const FileSystemMountPointProvider::ValidateFileSystemCallback& callback,
-    base::PlatformFileError* error) {
-  if (mount_point_provider)
-    mount_point_provider.get()->CollectOpenFileSystemMetrics(*error);
-  callback.Run(*error);
-}
-
-void ValidateRootOnFileThread(
-    ObfuscatedFileUtil* file_util,
-    const GURL& origin_url,
-    FileSystemType type,
-    bool create,
-    base::PlatformFileError* error_ptr) {
-  DCHECK(error_ptr);
-
-  base::FilePath root_path =
-      file_util->GetDirectoryForOriginAndType(
-          origin_url, type, create, error_ptr);
-  if (*error_ptr != base::PLATFORM_FILE_OK) {
-    UMA_HISTOGRAM_ENUMERATION(kOpenFileSystemLabel,
-                              kCreateDirectoryError,
-                              kFileSystemErrorMax);
-  } else {
-    UMA_HISTOGRAM_ENUMERATION(kOpenFileSystemLabel, kOK, kFileSystemErrorMax);
-  }
-  // The reference of file_util will be derefed on the FILE thread
-  // when the storage of this callback gets deleted regardless of whether
-  // this method is called or not.
-}
-
-}  // anonymous namespace
-
-const base::FilePath::CharType
-SandboxMountPointProvider::kFileSystemDirectory[] =
-    FILE_PATH_LITERAL("File System");
-
-// static
-bool SandboxMountPointProvider::IsSandboxType(FileSystemType type) {
-  return type == kFileSystemTypeTemporary ||
-         type == kFileSystemTypePersistent ||
-         type == kFileSystemTypeSyncable;
-}
-
-SandboxMountPointProvider::SandboxMountPointProvider(
-    quota::QuotaManagerProxy* quota_manager_proxy,
-    base::SequencedTaskRunner* file_task_runner,
-    const base::FilePath& profile_path,
-    const FileSystemOptions& file_system_options,
-    quota::SpecialStoragePolicy* special_storage_policy)
-    : file_task_runner_(file_task_runner),
-      profile_path_(profile_path),
-      file_system_options_(file_system_options),
-      enable_temporary_file_system_in_incognito_(false),
-      sandbox_file_util_(
-          new AsyncFileUtilAdapter(
-              new ObfuscatedFileUtil(
-                  profile_path.Append(kFileSystemDirectory)))),
-      file_system_usage_cache_(new FileSystemUsageCache(file_task_runner)),
-      quota_observer_(new SandboxQuotaObserver(
-                      quota_manager_proxy,
-                      file_task_runner,
-                      sandbox_sync_file_util(),
-                      file_system_usage_cache_.get())),
-      enable_usage_tracking_(
-          !CommandLine::ForCurrentProcess()->HasSwitch(
-              kDisableUsageTracking)),
-      special_storage_policy_(special_storage_policy),
-      weak_factory_(this) {
-  // Set quota observers.
-  UpdateObserverList::Source update_observers_src;
-  AccessObserverList::Source access_observers_src;
-
-  if (enable_usage_tracking_) {
-    update_observers_src.AddObserver(quota_observer_.get(), file_task_runner_);
-    access_observers_src.AddObserver(quota_observer_.get(), NULL);
-  }
-
-  update_observers_ = UpdateObserverList(update_observers_src);
-  access_observers_ = AccessObserverList(access_observers_src);
-  syncable_update_observers_ = UpdateObserverList(update_observers_src);
-}
-
-SandboxMountPointProvider::~SandboxMountPointProvider() {
-  if (!file_task_runner_->RunsTasksOnCurrentThread()) {
-    AsyncFileUtilAdapter* sandbox_file_util = sandbox_file_util_.release();
-    SandboxQuotaObserver* quota_observer = quota_observer_.release();
-    FileSystemUsageCache* file_system_usage_cache =
-        file_system_usage_cache_.release();
-    if (!file_task_runner_->DeleteSoon(FROM_HERE, sandbox_file_util))
-      delete sandbox_file_util;
-    if (!file_task_runner_->DeleteSoon(FROM_HERE, quota_observer))
-      delete quota_observer;
-    if (!file_task_runner_->DeleteSoon(FROM_HERE, file_system_usage_cache))
-      delete file_system_usage_cache;
-  }
-}
-
-bool SandboxMountPointProvider::CanHandleType(FileSystemType type) const {
-  return IsSandboxType(type);
-}
-
-void SandboxMountPointProvider::ValidateFileSystemRoot(
-    const GURL& origin_url, fileapi::FileSystemType type, bool create,
-    const ValidateFileSystemCallback& callback) {
-  if (file_system_options_.is_incognito() &&
-      !(type == kFileSystemTypeTemporary &&
-        enable_temporary_file_system_in_incognito_)) {
-    // TODO(kinuko): return an isolated temporary directory.
-    callback.Run(base::PLATFORM_FILE_ERROR_SECURITY);
-    UMA_HISTOGRAM_ENUMERATION(kOpenFileSystemLabel,
-                              kIncognito,
-                              kFileSystemErrorMax);
-    return;
-  }
-
-  if (!IsAllowedScheme(origin_url)) {
-    callback.Run(base::PLATFORM_FILE_ERROR_SECURITY);
-    UMA_HISTOGRAM_ENUMERATION(kOpenFileSystemLabel,
-                              kInvalidSchemeError,
-                              kFileSystemErrorMax);
-    return;
-  }
-
-  base::PlatformFileError* error_ptr = new base::PlatformFileError;
-  file_task_runner_->PostTaskAndReply(
-      FROM_HERE,
-      base::Bind(&ValidateRootOnFileThread,
-                 sandbox_sync_file_util(),
-                 origin_url, type, create,
-                 base::Unretained(error_ptr)),
-      base::Bind(&DidValidateFileSystemRoot,
-                 weak_factory_.GetWeakPtr(),
-                 callback, base::Owned(error_ptr)));
-
-  if (enable_usage_tracking_)
-    return;
-
-  // Schedule full usage recalculation on the next launch without
-  // --disable-file-system-usage-tracking.
-  file_task_runner_->PostTask(
-      FROM_HERE,
-      base::Bind(&SandboxMountPointProvider::InvalidateUsageCacheOnFileThread,
-                 sandbox_sync_file_util(), origin_url, type,
-                 file_system_usage_cache_.get()));
-};
-
-base::FilePath
-SandboxMountPointProvider::GetFileSystemRootPathOnFileThread(
-    const FileSystemURL& url,
-    bool create) {
-  if (file_system_options_.is_incognito() &&
-      !(enable_temporary_file_system_in_incognito_ &&
-        url.type() == kFileSystemTypeTemporary)) {
-    // TODO(kinuko): return an isolated temporary directory.
-    return base::FilePath();
-  }
-
-  if (!IsAllowedScheme(url.origin()))
-    return base::FilePath();
-
-  return GetBaseDirectoryForOriginAndType(url.origin(), url.type(), create);
-}
-
-FileSystemFileUtil* SandboxMountPointProvider::GetFileUtil(
-    FileSystemType type) {
-  DCHECK(sandbox_file_util_.get());
-  return sandbox_file_util_->sync_file_util();
-}
-
-AsyncFileUtil* SandboxMountPointProvider::GetAsyncFileUtil(
-    FileSystemType type) {
-  return sandbox_file_util_.get();
-}
-
-CopyOrMoveFileValidatorFactory*
-SandboxMountPointProvider::GetCopyOrMoveFileValidatorFactory(
-    FileSystemType type,
-    base::PlatformFileError* error_code) {
-  DCHECK(error_code);
-  *error_code = base::PLATFORM_FILE_OK;
-  return NULL;
-}
-
-void SandboxMountPointProvider::InitializeCopyOrMoveFileValidatorFactory(
-    FileSystemType type,
-    scoped_ptr<CopyOrMoveFileValidatorFactory> factory) {
-  DCHECK(!factory);
-}
-
-FilePermissionPolicy SandboxMountPointProvider::GetPermissionPolicy(
-    const FileSystemURL& url, int permissions) const {
-  if (!CanHandleType(url.type()) || !IsAllowedScheme(url.origin()))
-    return FILE_PERMISSION_ALWAYS_DENY;
-
-  if (url.path().ReferencesParent())
-    return FILE_PERMISSION_ALWAYS_DENY;
-
-  // Any write access is disallowed on the root path.
-  if ((url.path().empty() || VirtualPath::DirName(url.path()) == url.path())
-      && (permissions & ~kReadFilePermissions))
-    return FILE_PERMISSION_ALWAYS_DENY;
-
-  if ((permissions & kCreateFilePermissions) == kCreateFilePermissions) {
-    base::FilePath filename = VirtualPath::BaseName(url.path());
-    // See if the name is allowed to create.
-    for (size_t i = 0; i < arraysize(kRestrictedNames); ++i) {
-      if (filename.value() == kRestrictedNames[i])
-        return FILE_PERMISSION_ALWAYS_DENY;
-    }
-    for (size_t i = 0; i < arraysize(kRestrictedChars); ++i) {
-      if (filename.value().find(kRestrictedChars[i]) !=
-          base::FilePath::StringType::npos)
-        return FILE_PERMISSION_ALWAYS_DENY;
-    }
-  }
-
-  // Access to the sandbox directory (and only to the directory) should be
-  // always allowed.
-  return FILE_PERMISSION_ALWAYS_ALLOW;
-}
-
-FileSystemOperation* SandboxMountPointProvider::CreateFileSystemOperation(
-    const FileSystemURL& url,
-    FileSystemContext* context,
-    base::PlatformFileError* error_code) const {
-  scoped_ptr<FileSystemOperationContext> operation_context(
-      new FileSystemOperationContext(context));
-
-  // Copy the observer lists (assuming we only have small number of observers).
-  if (url.type() == kFileSystemTypeSyncable) {
-    operation_context->set_update_observers(syncable_update_observers_);
-    operation_context->set_change_observers(syncable_change_observers_);
-    operation_context->set_access_observers(access_observers_);
-    return new sync_file_system::SyncableFileSystemOperation(
-        context, operation_context.Pass());
-  }
-
-  // For regular sandboxed types.
-  operation_context->set_update_observers(update_observers_);
-  operation_context->set_access_observers(access_observers_);
-
-  if (special_storage_policy_ &&
-      special_storage_policy_->IsStorageUnlimited(url.origin())) {
-    operation_context->set_quota_limit_type(quota::kQuotaLimitTypeUnlimited);
-  } else {
-    operation_context->set_quota_limit_type(quota::kQuotaLimitTypeLimited);
-  }
-
-  // Temporarily disable returning unlimited storage policy for non-PERSISTENT
-  // storage. Since it may hurt performance for all FileSystem operation.
-  if (url.type() != kFileSystemTypePersistent &&
-      operation_context->quota_limit_type() == quota::kQuotaLimitTypeUnlimited)
-    operation_context->set_quota_limit_type(quota::kQuotaLimitTypeLimited);
-
-  return new LocalFileSystemOperation(context, operation_context.Pass());
-}
-
-scoped_ptr<webkit_blob::FileStreamReader>
-SandboxMountPointProvider::CreateFileStreamReader(
-    const FileSystemURL& url,
-    int64 offset,
-    const base::Time& expected_modification_time,
-    FileSystemContext* context) const {
-  return scoped_ptr<webkit_blob::FileStreamReader>(
-      new FileSystemFileStreamReader(
-          context, url, offset, expected_modification_time));
-}
-
-scoped_ptr<fileapi::FileStreamWriter>
-SandboxMountPointProvider::CreateFileStreamWriter(
-    const FileSystemURL& url,
-    int64 offset,
-    FileSystemContext* context) const {
-  return scoped_ptr<fileapi::FileStreamWriter>(
-      new SandboxFileStreamWriter(context, url, offset, update_observers_));
-}
-
-FileSystemQuotaUtil* SandboxMountPointProvider::GetQuotaUtil() {
-  return this;
-}
-
-void SandboxMountPointProvider::DeleteFileSystem(
-    const GURL& origin_url,
-    FileSystemType type,
-    FileSystemContext* context,
-    const DeleteFileSystemCallback& callback) {
-  base::PostTaskAndReplyWithResult(
-      context->task_runners()->file_task_runner(),
-      FROM_HERE,
-      // It is safe to pass Unretained(this) since context owns it.
-      base::Bind(&SandboxMountPointProvider::DeleteOriginDataOnFileThread,
-                 base::Unretained(this),
-                 make_scoped_refptr(context),
-                 base::Unretained(context->quota_manager_proxy()),
-                 origin_url,
-                 type),
-      callback);
-}
-
-SandboxMountPointProvider::OriginEnumerator*
-SandboxMountPointProvider::CreateOriginEnumerator() {
-  return new ObfuscatedOriginEnumerator(sandbox_sync_file_util());
-}
-
-base::FilePath SandboxMountPointProvider::GetBaseDirectoryForOriginAndType(
-    const GURL& origin_url, fileapi::FileSystemType type, bool create) {
-
-  base::PlatformFileError error = base::PLATFORM_FILE_OK;
-  base::FilePath path = sandbox_sync_file_util()->GetDirectoryForOriginAndType(
-      origin_url, type, create, &error);
-  if (error != base::PLATFORM_FILE_OK)
-    return base::FilePath();
-  return path;
-}
-
-base::PlatformFileError
-SandboxMountPointProvider::DeleteOriginDataOnFileThread(
-    FileSystemContext* file_system_context,
-    QuotaManagerProxy* proxy,
-    const GURL& origin_url,
-    fileapi::FileSystemType type) {
-
-  int64 usage = GetOriginUsageOnFileThread(file_system_context,
-                                           origin_url, type);
-
-  file_system_usage_cache_->CloseCacheFiles();
-  bool result = sandbox_sync_file_util()->DeleteDirectoryForOriginAndType(
-          origin_url, type);
-  if (result && proxy) {
-    proxy->NotifyStorageModified(
-        quota::QuotaClient::kFileSystem,
-        origin_url,
-        FileSystemTypeToQuotaStorageType(type),
-        -usage);
-  }
-
-  if (result)
-    return base::PLATFORM_FILE_OK;
-  return base::PLATFORM_FILE_ERROR_FAILED;
-}
-
-void SandboxMountPointProvider::GetOriginsForTypeOnFileThread(
-    fileapi::FileSystemType type, std::set<GURL>* origins) {
-  DCHECK(CanHandleType(type));
-  DCHECK(origins);
-  scoped_ptr<OriginEnumerator> enumerator(CreateOriginEnumerator());
-  GURL origin;
-  while (!(origin = enumerator->Next()).is_empty()) {
-    if (enumerator->HasFileSystemType(type))
-      origins->insert(origin);
-  }
-  switch (type) {
-    case kFileSystemTypeTemporary:
-      UMA_HISTOGRAM_COUNTS(kTemporaryOriginsCountLabel, origins->size());
-      break;
-    case kFileSystemTypePersistent:
-      UMA_HISTOGRAM_COUNTS(kPersistentOriginsCountLabel, origins->size());
-      break;
-    case kFileSystemTypeSyncable:
-      UMA_HISTOGRAM_COUNTS(kSyncableOriginsCountLabel, origins->size());
-      break;
-    default:
-      break;
-  }
-}
-
-void SandboxMountPointProvider::GetOriginsForHostOnFileThread(
-    fileapi::FileSystemType type, const std::string& host,
-    std::set<GURL>* origins) {
-  DCHECK(CanHandleType(type));
-  DCHECK(origins);
-  scoped_ptr<OriginEnumerator> enumerator(CreateOriginEnumerator());
-  GURL origin;
-  while (!(origin = enumerator->Next()).is_empty()) {
-    if (host == net::GetHostOrSpecFromURL(origin) &&
-        enumerator->HasFileSystemType(type))
-      origins->insert(origin);
-  }
-}
-
-int64 SandboxMountPointProvider::GetOriginUsageOnFileThread(
-    FileSystemContext* file_system_context,
-    const GURL& origin_url,
-    fileapi::FileSystemType type) {
-  DCHECK(CanHandleType(type));
-  if (!enable_usage_tracking_)
-    return 0;
-
-  // Don't use usage cache and return recalculated usage for sticky invalidated
-  // origins.
-  if (ContainsKey(sticky_dirty_origins_, std::make_pair(origin_url, type)))
-    return RecalculateUsage(file_system_context, origin_url, type);
-
-  base::FilePath base_path =
-      GetBaseDirectoryForOriginAndType(origin_url, type, false);
-  if (base_path.empty() || !file_util::DirectoryExists(base_path))
-    return 0;
-  base::FilePath usage_file_path =
-      base_path.Append(FileSystemUsageCache::kUsageFileName);
-
-  bool is_valid = file_system_usage_cache_->IsValid(usage_file_path);
-  uint32 dirty_status = 0;
-  bool dirty_status_available =
-      file_system_usage_cache_->GetDirty(usage_file_path, &dirty_status);
-  bool visited = !visited_origins_.insert(origin_url).second;
-  if (is_valid && (dirty_status == 0 || (dirty_status_available && visited))) {
-    // The usage cache is clean (dirty == 0) or the origin is already
-    // initialized and running.  Read the cache file to get the usage.
-    int64 usage = 0;
-    return file_system_usage_cache_->GetUsage(usage_file_path, &usage) ?
-        usage : -1;
-  }
-  // The usage cache has not been initialized or the cache is dirty.
-  // Get the directory size now and update the cache.
-  file_system_usage_cache_->Delete(usage_file_path);
-
-  int64 usage = RecalculateUsage(file_system_context, origin_url, type);
-
-  // This clears the dirty flag too.
-  file_system_usage_cache_->UpdateUsage(usage_file_path, usage);
-  return usage;
-}
-
-void SandboxMountPointProvider::InvalidateUsageCache(
-    const GURL& origin,
-    fileapi::FileSystemType type) {
-  DCHECK(CanHandleType(type));
-  base::PlatformFileError error = base::PLATFORM_FILE_OK;
-  base::FilePath usage_file_path = GetUsageCachePathForOriginAndType(
-      sandbox_sync_file_util(), origin, type, &error);
-  if (error != base::PLATFORM_FILE_OK)
-    return;
-  file_system_usage_cache_->IncrementDirty(usage_file_path);
-}
-
-void SandboxMountPointProvider::StickyInvalidateUsageCache(
-    const GURL& origin,
-    fileapi::FileSystemType type) {
-  DCHECK(CanHandleType(type));
-  sticky_dirty_origins_.insert(std::make_pair(origin, type));
-  quota_observer_->SetUsageCacheEnabled(origin, type, false);
-  InvalidateUsageCache(origin, type);
-}
-
-void SandboxMountPointProvider::CollectOpenFileSystemMetrics(
-    base::PlatformFileError error_code) {
-  base::Time now = base::Time::Now();
-  bool throttled = now < next_release_time_for_open_filesystem_stat_;
-  if (!throttled) {
-    next_release_time_for_open_filesystem_stat_ =
-        now + base::TimeDelta::FromHours(kMinimumStatsCollectionIntervalHours);
-  }
-
-#define REPORT(report_value)                                            \
-  UMA_HISTOGRAM_ENUMERATION(kOpenFileSystemDetailLabel,                 \
-                            (report_value),                             \
-                            kFileSystemErrorMax);                       \
-  if (!throttled) {                                                     \
-    UMA_HISTOGRAM_ENUMERATION(kOpenFileSystemDetailNonThrottledLabel,   \
-                              (report_value),                           \
-                              kFileSystemErrorMax);                     \
-  }
-
-  switch (error_code) {
-    case base::PLATFORM_FILE_OK:
-      REPORT(kOK);
-      break;
-    case base::PLATFORM_FILE_ERROR_INVALID_URL:
-      REPORT(kInvalidSchemeError);
-      break;
-    case base::PLATFORM_FILE_ERROR_NOT_FOUND:
-      REPORT(kNotFound);
-      break;
-    case base::PLATFORM_FILE_ERROR_FAILED:
-    default:
-      REPORT(kUnknownError);
-      break;
-  }
-#undef REPORT
-}
-
-const UpdateObserverList* SandboxMountPointProvider::GetUpdateObservers(
-    FileSystemType type) const {
-  DCHECK(CanHandleType(type));
-  if (type == kFileSystemTypeSyncable)
-    return &syncable_update_observers_;
-  return &update_observers_;
-}
-
-void SandboxMountPointProvider::AddSyncableFileUpdateObserver(
-    FileUpdateObserver* observer,
-    base::SequencedTaskRunner* task_runner) {
-  UpdateObserverList::Source observer_source =
-      syncable_update_observers_.source();
-  observer_source.AddObserver(observer, task_runner);
-  syncable_update_observers_ = UpdateObserverList(observer_source);
-}
-
-void SandboxMountPointProvider::AddSyncableFileChangeObserver(
-    FileChangeObserver* observer,
-    base::SequencedTaskRunner* task_runner) {
-  ChangeObserverList::Source observer_source =
-      syncable_change_observers_.source();
-  observer_source.AddObserver(observer, task_runner);
-  syncable_change_observers_ = ChangeObserverList(observer_source);
-}
-
-LocalFileSystemOperation*
-SandboxMountPointProvider::CreateFileSystemOperationForSync(
-    FileSystemContext* file_system_context) {
-  scoped_ptr<FileSystemOperationContext> operation_context(
-      new FileSystemOperationContext(file_system_context));
-  operation_context->set_update_observers(update_observers_);
-  operation_context->set_access_observers(access_observers_);
-  return new LocalFileSystemOperation(file_system_context,
-                                      operation_context.Pass());
-}
-
-base::FilePath SandboxMountPointProvider::GetUsageCachePathForOriginAndType(
-    const GURL& origin_url,
-    FileSystemType type) {
-  base::PlatformFileError error;
-  base::FilePath path = GetUsageCachePathForOriginAndType(
-      sandbox_sync_file_util(), origin_url, type, &error);
-  if (error != base::PLATFORM_FILE_OK)
-    return base::FilePath();
-  return path;
-}
-
-// static
-base::FilePath SandboxMountPointProvider::GetUsageCachePathForOriginAndType(
-    ObfuscatedFileUtil* sandbox_file_util,
-    const GURL& origin_url,
-    fileapi::FileSystemType type,
-    base::PlatformFileError* error_out) {
-  DCHECK(error_out);
-  *error_out = base::PLATFORM_FILE_OK;
-  base::FilePath base_path = sandbox_file_util->GetDirectoryForOriginAndType(
-      origin_url, type, false /* create */, error_out);
-  if (*error_out != base::PLATFORM_FILE_OK)
-    return base::FilePath();
-  return base_path.Append(FileSystemUsageCache::kUsageFileName);
-}
-
-bool SandboxMountPointProvider::IsAllowedScheme(const GURL& url) const {
-  // Basically we only accept http or https. We allow file:// URLs
-  // only if --allow-file-access-from-files flag is given.
-  if (url.SchemeIs("http") || url.SchemeIs("https"))
-    return true;
-  if (url.SchemeIsFileSystem())
-    return url.inner_url() && IsAllowedScheme(*url.inner_url());
-
-  for (size_t i = 0;
-       i < file_system_options_.additional_allowed_schemes().size();
-       ++i) {
-    if (url.SchemeIs(
-            file_system_options_.additional_allowed_schemes()[i].c_str()))
-      return true;
-  }
-  return false;
-}
-
-ObfuscatedFileUtil* SandboxMountPointProvider::sandbox_sync_file_util() {
-  DCHECK(sandbox_file_util_.get());
-  return static_cast<ObfuscatedFileUtil*>(sandbox_file_util_->sync_file_util());
-}
-
-// static
-void SandboxMountPointProvider::InvalidateUsageCacheOnFileThread(
-    ObfuscatedFileUtil* file_util,
-    const GURL& origin,
-    FileSystemType type,
-    FileSystemUsageCache* usage_cache) {
-  base::PlatformFileError error = base::PLATFORM_FILE_OK;
-  base::FilePath usage_cache_path = GetUsageCachePathForOriginAndType(
-      file_util, origin, type, &error);
-  if (error == base::PLATFORM_FILE_OK)
-    usage_cache->IncrementDirty(usage_cache_path);
-}
-
-int64 SandboxMountPointProvider::RecalculateUsage(FileSystemContext* context,
-                                                  const GURL& origin,
-                                                  FileSystemType type) {
-  FileSystemOperationContext operation_context(context);
-  FileSystemURL url = context->CreateCrackedFileSystemURL(
-      origin, type, base::FilePath());
-  scoped_ptr<FileSystemFileUtil::AbstractFileEnumerator> enumerator(
-      sandbox_sync_file_util()->CreateFileEnumerator(
-          &operation_context, url, true));
-
-  base::FilePath file_path_each;
-  int64 usage = 0;
-
-  while (!(file_path_each = enumerator->Next()).empty()) {
-    usage += enumerator->Size();
-    usage += ObfuscatedFileUtil::ComputeFilePathCost(file_path_each);
-  }
-
-  return usage;
-}
-
-}  // namespace fileapi