Change how the quota system computes the total poolsize for temporary storage

storage/browser/quota/quota_manager.cc

Index: storage/browser/quota/quota_manager.cc
diff --git a/storage/browser/quota/quota_manager.cc b/storage/browser/quota/quota_manager.cc
index 79268a61a297bf966605004646d272d27ea637d9..af4899d5600e5a448c7be9b6ecaa0db10a477650 100644
--- a/storage/browser/quota/quota_manager.cc
+++ b/storage/browser/quota/quota_manager.cc
@@ -26,6 +26,7 @@
 #include "base/strings/string_number_conversions.h"
 #include "base/sys_info.h"
 #include "base/task_runner_util.h"
+#include "base/threading/thread_task_runner_handle.h"
 #include "base/time/time.h"
 #include "base/trace_event/trace_event.h"
 #include "net/base/url_util.h"
@@ -47,19 +48,13 @@ namespace {
 
 const int64_t kMBytes = 1024 * 1024;
 const int kMinutesInMilliSeconds = 60 * 1000;
-
 const int64_t kReportHistogramInterval = 60 * 60 * 1000;  // 1 hour
-const double kTemporaryQuotaRatioToAvail = 1.0 / 3.0;  // 33%
 
 }  // namespace
 
-// Arbitrary for now, but must be reasonably small so that
-// in-memory databases can fit.
-// TODO(kinuko): Refer SysInfo::AmountOfPhysicalMemory() to determine this.
-const int64_t QuotaManager::kIncognitoDefaultQuotaLimit = 100 * kMBytes;
-
 const int64_t QuotaManager::kNoLimit = INT64_MAX;
 
+// TODO(michaeln): REMOVE
 const int QuotaManager::kPerHostTemporaryPortion = 5;  // 20%
 
 // Cap size for per-host persistent quota determined by the histogram.
@@ -68,17 +63,12 @@ const int QuotaManager::kPerHostTemporaryPortion = 5;  // 20%
 // usage that is less than 10GB for almost all users.
 const int64_t QuotaManager::kPerHostPersistentQuotaLimit = 10 * 1024 * kMBytes;
 
+// TODO(michaeln): REMOVE
+int64_t QuotaManager::kMinimumPreserveForSystem = 1024 * kMBytes;
+
 const char QuotaManager::kDatabaseName[] = "QuotaManager";
 
 const int QuotaManager::kThresholdOfErrorsToBeBlacklisted = 3;
-
-// Preserve kMinimumPreserveForSystem disk space for system book-keeping
-// when returning the quota to unlimited apps/extensions.
-// TODO(kinuko): This should be like 10% of the actual disk space.
-// For now we simply use a constant as getting the disk size needs
-// platform-dependent code. (http://crbug.com/178976)
-int64_t QuotaManager::kMinimumPreserveForSystem = 1024 * kMBytes;
-
 const int QuotaManager::kEvictionIntervalInMilliSeconds =
     30 * kMinutesInMilliSeconds;
 
@@ -234,121 +224,68 @@ bool UpdateModifiedTimeOnDBThread(const GURL& origin,
   return database->SetOriginLastModifiedTime(origin, type, modified_time);
 }
 
-int64_t CalculateTemporaryGlobalQuota(int64_t global_limited_usage,
-                                      int64_t available_space) {
-  DCHECK_GE(global_limited_usage, 0);
-  int64_t avail_space = available_space;
-  if (avail_space <
-      std::numeric_limits<int64_t>::max() - global_limited_usage) {
-    // We basically calculate the temporary quota by
-    // [available_space + space_used_for_temp] * kTempQuotaRatio,
-    // but make sure we'll have no overflow.
-    avail_space += global_limited_usage;
-  }
-  int64_t pool_size = avail_space * kTemporaryQuotaRatioToAvail;
-  UMA_HISTOGRAM_MBYTES("Quota.GlobalTemporaryPoolSize", pool_size);
-  return pool_size;
-}
-
-void DispatchTemporaryGlobalQuotaCallback(
-    const QuotaCallback& callback,
-    QuotaStatusCode status,
-    const UsageAndQuota& usage_and_quota) {
-  if (status != kQuotaStatusOk) {
-    callback.Run(status, 0);
-    return;
-  }
-
-  callback.Run(status, CalculateTemporaryGlobalQuota(
-      usage_and_quota.global_limited_usage,
-      usage_and_quota.available_disk_space));
-}
-
-int64_t CalculateQuotaWithDiskSpace(int64_t available_disk_space,
-                                    int64_t usage,
-                                    int64_t quota) {
-  if (available_disk_space < QuotaManager::kMinimumPreserveForSystem) {
-    LOG(WARNING)
-        << "Running out of disk space for profile."
-        << " QuotaManager starts forbidding further quota consumption.";
-    return usage;
-  }
-
-  if (quota < usage) {
-    // No more space; cap the quota to the current usage.
-    return usage;
-  }
-
-  available_disk_space -= QuotaManager::kMinimumPreserveForSystem;
-  if (available_disk_space < quota - usage)
-    return available_disk_space + usage;
-
-  return quota;
-}
-
-int64_t CalculateTemporaryHostQuota(int64_t host_usage,
-                                    int64_t global_quota,
-                                    int64_t global_limited_usage) {
-  DCHECK_GE(global_limited_usage, 0);
-  int64_t host_quota = global_quota / QuotaManager::kPerHostTemporaryPortion;
-  if (global_limited_usage > global_quota)
-    host_quota = std::min(host_quota, host_usage);
-  return host_quota;
-}
-
+// TODO: cleanup??
 void DispatchUsageAndQuotaForWebApps(
     StorageType type,
     bool is_incognito,
     bool is_unlimited,
-    bool can_query_disk_size,
+    int64_t cached_usage_for_incognito,
     const QuotaManager::GetUsageAndQuotaCallback& callback,
     QuotaStatusCode status,
-    const UsageAndQuota& usage_and_quota) {
+    const XUsageAndQuota& usage_and_quota) {
+  DCHECK(type == kStorageTypeTemporary ||  type == kStorageTypePersistent ||
+         type == kStorageTypeSyncable);
   if (status != kQuotaStatusOk) {
     callback.Run(status, 0, 0);
     return;
   }
 
-  int64_t usage = usage_and_quota.usage;
-  int64_t quota = usage_and_quota.quota;
-
-  if (type == kStorageTypeTemporary && !is_unlimited) {
-    quota = CalculateTemporaryHostQuota(
-        usage, quota, usage_and_quota.global_limited_usage);
-  }
-
+  //int64_t available = usage_and_quota.available_disk_space;
   if (is_incognito) {
-    quota = std::min(quota, QuotaManager::kIncognitoDefaultQuotaLimit);
-    callback.Run(status, usage, quota);
-    return;
-  }
-
-  // For apps with unlimited permission or can_query_disk_size is true (and not
-  // in incognito mode).
-  // We assume we can expose the actual disk size for them and cap the quota by
-  // the available disk space.
-  if (is_unlimited || can_query_disk_size) {
-    quota = CalculateQuotaWithDiskSpace(
-        usage_and_quota.available_disk_space,
-        usage, quota);
-  }
-
-  callback.Run(status, usage, quota);
-
-  if (type == kStorageTypeTemporary && !is_unlimited)
-    UMA_HISTOGRAM_MBYTES("Quota.QuotaForOrigin", quota);
+    //int64_t incognito_space_avalable = pool_size -
+    //    cached_usage_for_incognito;
+    //available = std::max(INT64_C(0), incognito_space_avalable);
+  }
+
+  // For persistent and syncable, usage_and_quota.quota contains a
+  // per-host value. For the temporary type, usage_and_quota.quota
+  // contains the shared poolsize. Hoever, if the origin is unlimited,
+  // it will contain kNoLimit which is INT64_MAX.
+  int64_t desired_host_quota = usage_and_quota.quota;
+  if (type == kStorageTypeTemporary)
+    desired_host_quota /= QuotaManager::kPerHostTemporaryPortion;
+
+  int min_preserve = !is_unlimited && (type == kStorageTypeTemporary) ?
+      desired_host_quota : QuotaManager::kMinimumPreserveForSystem;
+
+  // Constrain the desired |host_quota| to something that fits.
+  // If available space is too low, cap usage at current levels.
+  // If it's close to being too low, cap growth to avoid it getting too low.
+  // We define "too low" as not enough room for another hosts
+  // nominal desired amount of data.
+  // Note: for incognito, available space is a number based on
+  // system memory.
+  int64_t host_quota = std::min(
+      desired_host_quota,
+      usage_and_quota.usage +
+          std::max(INT64_C(0),
+                   usage_and_quota.available_disk_space - min_preserve));
+
+  callback.Run(status, usage_and_quota.usage, host_quota);
+  if (type == kStorageTypeTemporary && !is_incognito && !is_unlimited)
+    UMA_HISTOGRAM_MBYTES("Quota.QuotaForOrigin", host_quota);
 }
 
 }  // namespace
 
-UsageAndQuota::UsageAndQuota()
+XUsageAndQuota::XUsageAndQuota()
     : usage(0),
       global_limited_usage(0),
       quota(0),
       available_disk_space(0) {
 }
 
-UsageAndQuota::UsageAndQuota(int64_t usage,
+XUsageAndQuota::XUsageAndQuota(int64_t usage,
                              int64_t global_limited_usage,
                              int64_t quota,
                              int64_t available_disk_space)
@@ -357,6 +294,7 @@ UsageAndQuota::UsageAndQuota(int64_t usage,
       quota(quota),
       available_disk_space(available_disk_space) {}
 
+// TODO: cleanup???
 class UsageAndQuotaCallbackDispatcher
     : public QuotaTask,
       public base::SupportsWeakPtr<UsageAndQuotaCallbackDispatcher> {
@@ -373,7 +311,7 @@ class UsageAndQuotaCallbackDispatcher
 
   ~UsageAndQuotaCallbackDispatcher() override {}
 
-  void WaitForResults(const QuotaManager::UsageAndQuotaCallback& callback) {
+  void WaitForResults(const QuotaManager::XUsageAndQuotaCallback& callback) {
     callback_ = callback;
     Start();
   }
@@ -427,6 +365,12 @@ class UsageAndQuotaCallbackDispatcher
                       AsWeakPtr());
   }
 
+  TemporaryStorageConfigurationCallback GetTempStorageConfigCallback() {
+    ++waiting_callbacks_;
+    return base::Bind(&UsageAndQuotaCallbackDispatcher::DidGetTempStorageConfig,
+                      AsWeakPtr());
+  }
+
  private:
   void DidGetHostUsage(int64_t usage) {
     if (status_ == kQuotaStatusUnknown)
@@ -461,6 +405,11 @@ class UsageAndQuotaCallbackDispatcher
     CheckCompleted();
   }
 
+  void DidGetTempStorageConfig(const TemporaryStorageConfiguration& config) {
+    storage_config_ = config;
+    CheckCompleted();
+  }
+
   void Run() override {
     // We initialize waiting_callbacks to 1 so that we won't run
     // the completion callback until here even some of the callbacks
@@ -469,7 +418,7 @@ class UsageAndQuotaCallbackDispatcher
   }
 
   void Aborted() override {
-    callback_.Run(kQuotaErrorAbort, UsageAndQuota());
+    callback_.Run(kQuotaErrorAbort, XUsageAndQuota());
     DeleteSoon();
   }
 
@@ -500,8 +449,9 @@ class UsageAndQuotaCallbackDispatcher
   bool has_available_disk_space_;
 
   QuotaStatusCode status_;
-  UsageAndQuota usage_and_quota_;
-  QuotaManager::UsageAndQuotaCallback callback_;
+  XUsageAndQuota usage_and_quota_;
+  TemporaryStorageConfiguration storage_config_;
+  QuotaManager::XUsageAndQuotaCallback callback_;
   int waiting_callbacks_;
 
   DISALLOW_COPY_AND_ASSIGN(UsageAndQuotaCallbackDispatcher);
@@ -866,21 +816,31 @@ QuotaManager::QuotaManager(
     const base::FilePath& profile_path,
     const scoped_refptr<base::SingleThreadTaskRunner>& io_thread,
     const scoped_refptr<base::SequencedTaskRunner>& db_thread,
-    const scoped_refptr<SpecialStoragePolicy>& special_storage_policy)
+    const scoped_refptr<SpecialStoragePolicy>& special_storage_policy,
+    GetTemporaryStorageConfigurationFunc get_config_function)
     : is_incognito_(is_incognito),
       profile_path_(profile_path),
       proxy_(new QuotaManagerProxy(this, io_thread)),
       db_disabled_(false),
       eviction_disabled_(false),
+      get_config_function_(get_config_function),
+      get_config_task_runner_(base::ThreadTaskRunnerHandle::Get()),
       io_thread_(io_thread),
       db_thread_(db_thread),
       is_getting_eviction_origin_(false),
-      temporary_quota_initialized_(false),
-      temporary_quota_override_(-1),
       special_storage_policy_(special_storage_policy),
       get_volume_info_fn_(&QuotaManager::GetVolumeInfo),
       storage_monitor_(new StorageMonitor(this)),
-      weak_factory_(this) {}
+      weak_factory_(this) {
+  // Reset to ensure we refresh the config the first times it's accessed.
+  storage_config_.refresh_interval = base::TimeDelta();
+}
+
+void QuotaManager::SetTemporaryStorageConfiguration(
+    const TemporaryStorageConfiguration& config) {
+  storage_config_ = config;
+  storage_config_timestamp_ = base::TimeTicks::Now();
+}
 
 void QuotaManager::GetUsageInfo(const GetUsageInfoCallback& callback) {
   LazyInitialize();
@@ -902,22 +862,23 @@ void QuotaManager::GetUsageAndQuotaForWebApps(
     callback.Run(kQuotaErrorNotSupported, 0, 0);
     return;
   }
+  if (is_incognito_ && type != kStorageTypeTemporary) {
+    callback.Run(kQuotaErrorNotSupported, 0, 0);
+    return;
+  }
 
   DCHECK(origin == origin.GetOrigin());
   LazyInitialize();
 
-  bool unlimited = IsStorageUnlimited(origin, type);
-  bool can_query_disk_size = CanQueryDiskSize(origin);
+  bool is_unlimited = IsStorageUnlimited(origin, type);
 
   UsageAndQuotaCallbackDispatcher* dispatcher =
       new UsageAndQuotaCallbackDispatcher(this);
 
-  if (unlimited) {
+  if (is_unlimited) {
     dispatcher->set_quota(kNoLimit);
   } else {
     if (type == kStorageTypeTemporary) {
-      GetUsageTracker(type)->GetGlobalLimitedUsage(
-          dispatcher->GetGlobalLimitedUsageCallback());
       GetTemporaryGlobalQuota(dispatcher->GetQuotaCallback());
     } else if (type == kStorageTypePersistent) {
       GetPersistentHostQuota(net::GetHostOrSpecFromURL(origin),
@@ -927,17 +888,20 @@ void QuotaManager::GetUsageAndQuotaForWebApps(
     }
   }
 
-  DCHECK(GetUsageTracker(type));
   GetUsageTracker(type)->GetHostUsage(net::GetHostOrSpecFromURL(origin),
                                       dispatcher->GetHostUsageCallback());
 
-  if (!is_incognito_ && (unlimited || can_query_disk_size))
-    GetAvailableSpace(dispatcher->GetAvailableSpaceCallback());
+  int64_t cached_usage_for_incognito = 0;
+  if (!is_incognito_) {
+    xGetAvailableSpace(dispatcher->GetAvailableSpaceCallback());
+  } else {
+    cached_usage_for_incognito = GetUsageTracker(type)->GetCachedUsage();
+  }
 
   dispatcher->WaitForResults(base::Bind(
       &DispatchUsageAndQuotaForWebApps,
-      type, is_incognito_, unlimited, can_query_disk_size,
-      callback));
+      type, is_incognito_, is_unlimited,
+      cached_usage_for_incognito, callback));
 }
 
 void QuotaManager::GetUsageAndQuota(
@@ -1019,13 +983,14 @@ void QuotaManager::DeleteHostData(const std::string& host,
   deleter->Start();
 }
 
-void QuotaManager::GetAvailableSpace(const AvailableSpaceCallback& callback) {
+void QuotaManager::xGetAvailableSpace(const AvailableSpaceCallback& callback) {
   if (!available_space_callbacks_.Add(callback))
     return;
   // crbug.com/349708
   TRACE_EVENT0("io", "QuotaManager::GetAvailableSpace");
 
-  PostTaskAndReplyWithResult(
+  // TODO: if (incognito) return poolsize - globalusage;
+  base::PostTaskAndReplyWithResult(
       db_thread_.get(),
       FROM_HERE,
       base::Bind(&QuotaManager::CallGetAmountOfFreeDiskSpace,
@@ -1034,55 +999,18 @@ void QuotaManager::GetAvailableSpace(const AvailableSpaceCallback& callback) {
                  weak_factory_.GetWeakPtr()));
 }
 
-void QuotaManager::GetTemporaryGlobalQuota(const QuotaCallback& callback) {
-  LazyInitialize();
-  if (!temporary_quota_initialized_) {
-    db_initialization_callbacks_.Add(base::Bind(
-        &QuotaManager::GetTemporaryGlobalQuota,
-        weak_factory_.GetWeakPtr(), callback));
-    return;
-  }
-
-  if (temporary_quota_override_ > 0) {
-    callback.Run(kQuotaStatusOk, temporary_quota_override_);
-    return;
-  }
-
-  UsageAndQuotaCallbackDispatcher* dispatcher =
-      new UsageAndQuotaCallbackDispatcher(this);
-  GetUsageTracker(kStorageTypeTemporary)->
-      GetGlobalLimitedUsage(dispatcher->GetGlobalLimitedUsageCallback());
-  GetAvailableSpace(dispatcher->GetAvailableSpaceCallback());
-  dispatcher->WaitForResults(
-      base::Bind(&DispatchTemporaryGlobalQuotaCallback, callback));
+namespace {
+void ContinueGetTemporaryQuota(
+    const QuotaCallback& callback,
+    const TemporaryStorageConfiguration& pool_config) {
+  callback.Run(kQuotaStatusOk, pool_config.pool_size);
+}
 }
 
-void QuotaManager::SetTemporaryGlobalOverrideQuota(
-    int64_t new_quota,
-    const QuotaCallback& callback) {
+void QuotaManager::GetTemporaryGlobalQuota(const QuotaCallback& callback) {
   LazyInitialize();
-
-  if (new_quota < 0) {
-    if (!callback.is_null())
-      callback.Run(kQuotaErrorInvalidModification, -1);
-    return;
-  }
-
-  if (db_disabled_) {
-    if (!callback.is_null())
-      callback.Run(kQuotaErrorInvalidAccess, -1);
-    return;
-  }
-
-  int64_t* new_quota_ptr = new int64_t(new_quota);
-  PostTaskAndReplyWithResultForDBThread(
-      FROM_HERE,
-      base::Bind(&SetTemporaryGlobalOverrideQuotaOnDBThread,
-                 base::Unretained(new_quota_ptr)),
-      base::Bind(&QuotaManager::DidSetTemporaryGlobalOverrideQuota,
-                 weak_factory_.GetWeakPtr(),
-                 callback,
-                 base::Owned(new_quota_ptr)));
+  GetTemporaryStorageConfig(
+          base::Bind(&ContinueGetTemporaryQuota, callback));
 }
 
 void QuotaManager::GetPersistentHostQuota(const std::string& host,
@@ -1126,10 +1054,8 @@ void QuotaManager::SetPersistentHostQuota(const std::string& host,
     return;
   }
 
-  if (kPerHostPersistentQuotaLimit < new_quota) {
-    // Cap the requested size at the per-host quota limit.
-    new_quota = kPerHostPersistentQuotaLimit;
-  }
+  // Cap the requested size at the per-host quota limit.
+  new_quota = std::min(new_quota, kPerHostPersistentQuotaLimit);
 
   if (db_disabled_) {
     callback.Run(kQuotaErrorInvalidAccess, -1);
@@ -1289,7 +1215,7 @@ QuotaManager::EvictionContext::~EvictionContext() {
 void QuotaManager::LazyInitialize() {
   DCHECK(io_thread_->BelongsToCurrentThread());
   if (database_) {
-    // Initialization seems to be done already.
+    // Already initialized.
     return;
   }
 
@@ -1307,17 +1233,16 @@ void QuotaManager::LazyInitialize() {
       clients_, kStorageTypeSyncable, special_storage_policy_.get(),
       storage_monitor_.get()));
 
-  int64_t* temporary_quota_override = new int64_t(-1);
-  int64_t* desired_available_space = new int64_t(-1);
-  PostTaskAndReplyWithResultForDBThread(
-      FROM_HERE,
-      base::Bind(&InitializeOnDBThread,
-                 base::Unretained(temporary_quota_override),
-                 base::Unretained(desired_available_space)),
-      base::Bind(&QuotaManager::DidInitialize,
-                 weak_factory_.GetWeakPtr(),
-                 base::Owned(temporary_quota_override),
-                 base::Owned(desired_available_space)));
+  if (!is_incognito_) {
+    histogram_timer_.Start(FROM_HERE,
+                           base::TimeDelta::FromMilliseconds(
+                               kReportHistogramInterval),
+                           this, &QuotaManager::ReportHistogram);
+  }
+
+  GetTemporaryGlobalQuota(
+      base::Bind(&QuotaManager::DidGetInitialTemporaryGlobalQuota,
+                 weak_factory_.GetWeakPtr(), base::TimeTicks::Now()));
 }
 
 void QuotaManager::RegisterClient(QuotaClient* client) {
@@ -1414,9 +1339,6 @@ void QuotaManager::StartEviction() {
   DCHECK(!temporary_storage_evictor_.get());
   temporary_storage_evictor_.reset(new QuotaTemporaryStorageEvictor(
       this, kEvictionIntervalInMilliSeconds));
-  if (desired_available_space_ >= 0)
-    temporary_storage_evictor_->set_min_available_disk_space_to_start_eviction(
-        desired_available_space_);
   temporary_storage_evictor_->Start();
 }
 
@@ -1635,7 +1557,7 @@ void QuotaManager::EvictOriginData(const GURL& origin,
 }
 
 void QuotaManager::GetUsageAndQuotaForEviction(
-    const UsageAndQuotaCallback& callback) {
+    const XUsageAndQuotaCallback& callback) {
   // crbug.com/349708
   TRACE_EVENT0("io", "QuotaManager::GetUsageAndQuotaForEviction");
 
@@ -1647,7 +1569,7 @@ void QuotaManager::GetUsageAndQuotaForEviction(
   GetUsageTracker(kStorageTypeTemporary)
       ->GetGlobalLimitedUsage(dispatcher->GetGlobalLimitedUsageCallback());
   GetTemporaryGlobalQuota(dispatcher->GetQuotaCallback());
-  GetAvailableSpace(dispatcher->GetAvailableSpaceCallback());
+  xGetAvailableSpace(dispatcher->GetAvailableSpaceCallback());
   dispatcher->WaitForResults(callback);
 }
 
@@ -1656,7 +1578,7 @@ void QuotaManager::AsyncGetVolumeInfo(
   DCHECK(io_thread_->BelongsToCurrentThread());
   uint64_t* available_space = new uint64_t(0);
   uint64_t* total_space = new uint64_t(0);
-  PostTaskAndReplyWithResult(
+  base::PostTaskAndReplyWithResult(
       db_thread_.get(),
       FROM_HERE,
       base::Bind(get_volume_info_fn_,
@@ -1699,28 +1621,13 @@ void QuotaManager::GetLRUOrigin(StorageType type,
                  base::Owned(url)));
 }
 
-void QuotaManager::DidSetTemporaryGlobalOverrideQuota(
-    const QuotaCallback& callback,
-    const int64_t* new_quota,
-    bool success) {
-  QuotaStatusCode status = kQuotaErrorInvalidAccess;
-  DidDatabaseWork(success);
-  if (success) {
-    temporary_quota_override_ = *new_quota;
-    status = kQuotaStatusOk;
-  }
-
-  if (callback.is_null())
-    return;
-
-  callback.Run(status, *new_quota);
-}
-
 void QuotaManager::DidGetPersistentHostQuota(const std::string& host,
                                              const int64_t* quota,
                                              bool success) {
   DidDatabaseWork(success);
-  persistent_host_quota_callbacks_.Run(host, kQuotaStatusOk, *quota);
+  persistent_host_quota_callbacks_.Run(
+      host, kQuotaStatusOk,
+      std::min(*quota, kPerHostPersistentQuotaLimit));
 }
 
 void QuotaManager::DidSetPersistentHostQuota(const std::string& host,
@@ -1731,27 +1638,6 @@ void QuotaManager::DidSetPersistentHostQuota(const std::string& host,
   callback.Run(success ? kQuotaStatusOk : kQuotaErrorInvalidAccess, *new_quota);
 }
 
-void QuotaManager::DidInitialize(int64_t* temporary_quota_override,
-                                 int64_t* desired_available_space,
-                                 bool success) {
-  temporary_quota_override_ = *temporary_quota_override;
-  desired_available_space_ = *desired_available_space;
-  temporary_quota_initialized_ = true;
-  DidDatabaseWork(success);
-
-  if (!is_incognito_) {
-    histogram_timer_.Start(FROM_HERE,
-                           base::TimeDelta::FromMilliseconds(
-                               kReportHistogramInterval),
-                           this, &QuotaManager::ReportHistogram);
-  }
-
-  db_initialization_callbacks_.Run();
-  GetTemporaryGlobalQuota(
-      base::Bind(&QuotaManager::DidGetInitialTemporaryGlobalQuota,
-                 weak_factory_.GetWeakPtr(), base::TimeTicks::Now()));
-}
-
 void QuotaManager::DidGetLRUOrigin(const GURL* origin,
                                    bool success) {
   DidDatabaseWork(success);
@@ -1797,6 +1683,48 @@ void QuotaManager::DidGetAvailableSpace(int64_t space) {
   available_space_callbacks_.Run(kQuotaStatusOk, space);
 }
 
+namespace {
+void DidGetTempStorageConfigThreadAdapter(
+    base::TaskRunner* task_runner,
+    const TemporaryStorageConfigurationCallback& callback,
+    const TemporaryStorageConfiguration& storage_config) {
+  task_runner->PostTask(FROM_HERE, base::Bind(callback, storage_config));
+}
+}  // namespace
+
+void QuotaManager::GetTemporaryStorageConfig(
+    const TemporaryStorageConfigurationCallback& callback) {
+  if (base::TimeTicks::Now() - storage_config_timestamp_ <
+      storage_config_.refresh_interval) {
+    callback.Run(storage_config_);
+    return;
+   }
+
+   if (!storage_config_callbacks_.Add(callback))
+     return;
+
+  // We invoke our clients GetTemporaryPoolConfigurationFunc on the
+  // UI thread and plumb the resulting value back to this thread.

[kinuko, 2016/07/27 14:23:25]

Could you help me understand why it needs to be called from the UI thread?

+  get_config_task_runner_->PostTask(
+      FROM_HERE,
+      base::Bind(
+          get_config_function_,
+          profile_path_, is_incognito_,
+          base::Bind(
+              &DidGetTempStorageConfigThreadAdapter,
+              base::RetainedRef(base::ThreadTaskRunnerHandle::Get()),
+              base::Bind(
+                  &QuotaManager::DidGetTemporaryStorageConfig,
+                  weak_factory_.GetWeakPtr()))));
+}
+
+void QuotaManager::DidGetTemporaryStorageConfig(
+    const TemporaryStorageConfiguration& config) {
+  SetTemporaryStorageConfiguration(config);
+  storage_config_callbacks_.Run(config);
+}
+
+
 void QuotaManager::DidDatabaseWork(bool success) {
   db_disabled_ = !success;
 }