[Offline Pages] Add cached offline page utils and show usage in settings.

chrome/browser/android/offline_pages/offline_page_utils.cc

Index: chrome/browser/android/offline_pages/offline_page_utils.cc
diff --git a/chrome/browser/android/offline_pages/offline_page_utils.cc b/chrome/browser/android/offline_pages/offline_page_utils.cc
index 48dda928449c6dea04058e40600f8323dc871da5..645041f9ca8f1005a1554293d4d742aa7cde0a5e 100644
--- a/chrome/browser/android/offline_pages/offline_page_utils.cc
+++ b/chrome/browser/android/offline_pages/offline_page_utils.cc
@@ -129,6 +129,19 @@ void CheckDuplicateOngoingDownloads(
       request_coordinator_continuation, browser_context, url, callback));
 }
 
+void DoCalculateSizeBetween(
+    const offline_pages::SizeInBytesCallback& callback,
+    const base::Time& begin_time,
+    const base::Time& end_time,
+    const offline_pages::MultipleOfflinePageItemResult& result) {
+  int64_t total_size = 0;
+  for (auto& page : result) {
+    if (begin_time <= page.creation_time && page.creation_time < end_time)
+      total_size += page.file_size;
+  }
+  callback.Run(total_size);
+}
+
 }  // namespace
 
 // static
@@ -308,4 +321,23 @@ bool OfflinePageUtils::CanDownloadAsOfflinePage(
           net::MatchesMimeType(contents_mime_type, "application/xhtml+xml"));
 }
 
+// static
+bool OfflinePageUtils::GetCachedOfflinePageSizeBetween(
+    content::BrowserContext* browser_context,
+    const SizeInBytesCallback& callback,
+    const base::Time& begin_time,
+    const base::Time& end_time) {
+  OfflinePageModel* offline_page_model =
+      OfflinePageModelFactory::GetForBrowserContext(browser_context);
+  if (!offline_page_model || begin_time > end_time)
+    return false;
+  OfflinePageModelQueryBuilder builder;
+  builder.RequireRemovedOnCacheReset(
+      OfflinePageModelQuery::Requirement::INCLUDE_MATCHING);
+  offline_page_model->GetPagesMatchingQuery(
+      builder.Build(offline_page_model->GetPolicyController()),
+      base::Bind(&DoCalculateSizeBetween, callback, begin_time, end_time));
+  return true;
+}
+
 }  // namespace offline_pages