[DO NOT COMMIT][Offline Pages] Moving Offline Page Cache to cache directory.

components/offline_pages/core/offline_page_model_impl.h

Index: components/offline_pages/core/offline_page_model_impl.h
diff --git a/components/offline_pages/core/offline_page_model_impl.h b/components/offline_pages/core/offline_page_model_impl.h
index 64e2e3cfdfd69a91cea957a29933a927f1efd7a7..499a3007961466302af87638aea212c335187ccd 100644
--- a/components/offline_pages/core/offline_page_model_impl.h
+++ b/components/offline_pages/core/offline_page_model_impl.h
@@ -57,7 +57,7 @@ class OfflinePageModelImpl : public OfflinePageModel, public KeyedService {
   // All blocking calls/disk access will happen on the provided |task_runner|.
   OfflinePageModelImpl(
       std::unique_ptr<OfflinePageMetadataStore> store,
-      const base::FilePath& archives_dir,
+      const ArchiveDirectories& archive_dirs,
       const scoped_refptr<base::SequencedTaskRunner>& task_runner);
   ~OfflinePageModelImpl() override;
 
@@ -245,6 +245,10 @@ class OfflinePageModelImpl : public OfflinePageModel, public KeyedService {
   // Check if |offline_page| should be removed on cache reset by user.
   bool IsRemovedOnCacheReset(const OfflinePageItem& offline_page) const;
 
+  // Get the archive directory based on namespace.
+  const base::FilePath& GetArchiveDirectory(
+      const std::string& name_space) const;
+
   void RunWhenLoaded(const base::Closure& job);
 
   base::Time GetCurrentTime() const;
@@ -253,7 +257,7 @@ class OfflinePageModelImpl : public OfflinePageModel, public KeyedService {
   std::unique_ptr<OfflinePageMetadataStore> store_;
 
   // Location where all of the archive files will be stored.
-  base::FilePath archives_dir_;
+  ArchiveDirectories archive_dirs_;
 
   // The observers.
   base::ObserverList<Observer> observers_;