Make all quota-exceeding messages in the storage API explain what the failure

chrome/browser/extensions/settings/settings_api.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 "chrome/browser/extensions/settings/settings_api.h"
 
 #include <string>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 136 matching lines @@
 
 // Creates quota heuristics for settings modification.
 void GetModificationQuotaLimitHeuristics(QuotaLimitHeuristics* heuristics) {
   QuotaLimitHeuristic::Config longLimitConfig = {
     // See storage.json for current value.
     api::storage::sync::MAX_WRITE_OPERATIONS_PER_HOUR,
     base::TimeDelta::FromHours(1)
   };
   heuristics->push_back(
       new ExtensionsQuotaService::TimedLimit(
-          longLimitConfig, new QuotaLimitHeuristic::SingletonBucketMapper()));
+          longLimitConfig,
+          new QuotaLimitHeuristic::SingletonBucketMapper(),
+          "MAX_WRITE_OPERATIONS_PER_HOUR"));
 
   // A max of 10 operations per minute, sustained over 10 minutes.
   QuotaLimitHeuristic::Config shortLimitConfig = {
     // See storage.json for current value.
     api::storage::sync::MAX_SUSTAINED_WRITE_OPERATIONS_PER_MINUTE,
     base::TimeDelta::FromMinutes(1)
   };
   heuristics->push_back(
       new ExtensionsQuotaService::SustainedLimit(
           base::TimeDelta::FromMinutes(10),
           shortLimitConfig,
-          new QuotaLimitHeuristic::SingletonBucketMapper()));
+          new QuotaLimitHeuristic::SingletonBucketMapper(),
+          "MAX_SUSTAINED_WRITE_OPERATIONS_PER_MINUTE"));
 };
 
 }  // namespace
 
 bool GetSettingsFunction::RunWithStorage(ValueStore* storage) {
   Value* input = NULL;
   EXTENSION_FUNCTION_VALIDATE(args_->Get(0, &input));
 
   switch (input->GetType()) {
     case Value::TYPE_NULL:
@@ skipping 106 matching lines @@
 bool ClearSettingsFunction::RunWithStorage(ValueStore* storage) {
   return UseWriteResult(storage->Clear());
 }
 
 void ClearSettingsFunction::GetQuotaLimitHeuristics(
     QuotaLimitHeuristics* heuristics) const {
   GetModificationQuotaLimitHeuristics(heuristics);
 }
 
 }  // namespace extensions