[Offline pages] Moving disk size related calls to Archive Manager, reorganizing UMA

components/offline_pages/archive_manager.cc

Index: components/offline_pages/archive_manager.cc
diff --git a/components/offline_pages/archive_manager.cc b/components/offline_pages/archive_manager.cc
index 6c9bbbc4db3d68df52a46228440e517813ecf89e..9dfeabbe0b0c82460a888db52c37535e5edea693 100644
--- a/components/offline_pages/archive_manager.cc
+++ b/components/offline_pages/archive_manager.cc
@@ -10,6 +10,7 @@
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
 #include "base/sequenced_task_runner.h"
+#include "base/sys_info.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "components/offline_pages/archive_manager.h"
 
@@ -17,6 +18,9 @@ namespace offline_pages {
 
 namespace {
 
+using StorageStatsCallback =
+    base::Callback<void(const ArchiveManager::StorageStats& storage_stats)>;
+
 void EnsureArchivesDirCreatedImpl(const base::FilePath& archives_dir) {
   CHECK(base::CreateDirectory(archives_dir));
 }
@@ -53,6 +57,16 @@ void GetAllArchivesImpl(
   task_runner->PostTask(FROM_HERE, base::Bind(callback, archive_paths));
 }
 
+void GetStorageStatsImpl(const base::FilePath& archive_dir,
+                         scoped_refptr<base::SequencedTaskRunner> task_runner,
+                         const StorageStatsCallback& callback) {
+  ArchiveManager::StorageStats storage_stats;
+  storage_stats.free_disk_space =
+      base::SysInfo::AmountOfFreeDiskSpace(archive_dir);
+  storage_stats.total_archives_size = base::ComputeDirectorySize(archive_dir);
+  task_runner->PostTask(FROM_HERE, base::Bind(callback, storage_stats));
+}
+
 }  // namespace
 
 ArchiveManager::ArchiveManager(
@@ -97,4 +111,11 @@ void ArchiveManager::GetAllArchives(
                             base::ThreadTaskRunnerHandle::Get(), callback));
 }
 
+void ArchiveManager::GetStorageStats(
+    const StorageStatsCallback& callback) const {
+  task_runner_->PostTask(
+      FROM_HERE, base::Bind(GetStorageStatsImpl, archives_dir_,
+                            base::ThreadTaskRunnerHandle::Get(), callback));
+}
+
 }  // namespace offline_pages