Quota: Implement QuotaBackendImpl

webkit/browser/fileapi/quota/quota_reservation_manager.h

Index: webkit/browser/fileapi/quota/quota_reservation_manager.h
diff --git a/webkit/browser/fileapi/quota/quota_reservation_manager.h b/webkit/browser/fileapi/quota/quota_reservation_manager.h
index 2e3ae9358998baa42d48c96f635a514522db9660..d4c58ac9ab641bb28b288134db940bb2be860e2c 100644
--- a/webkit/browser/fileapi/quota/quota_reservation_manager.h
+++ b/webkit/browser/fileapi/quota/quota_reservation_manager.h
@@ -6,6 +6,7 @@
 #define WEBKIT_BROWSER_FILEAPI_QUOTA_QUOTA_RESERVATION_MANAGER_H_
 
 #include <map>
+#include <utility>
 
 #include "base/basictypes.h"
 #include "base/callback_forward.h"
@@ -26,12 +27,18 @@ class OpenFileHandleContext;
 class WEBKIT_STORAGE_BROWSER_EXPORT QuotaReservationManager {
  public:
   typedef base::Callback<void(base::PlatformFileError error)> StatusCallback;
+
+  // Callback for ReserveQuota. When this callback returns false, ReserveQuota
+  // operation should be reverted.
   typedef base::Callback<bool(base::PlatformFileError error)>
       ReserveQuotaCallback;
 
   // An abstraction of backing quota system.
-  class QuotaBackend {
+  class WEBKIT_STORAGE_BROWSER_EXPORT QuotaBackend {
    public:
+    QuotaBackend() {}
+    virtual ~QuotaBackend() {}
+
     // Reserves or reclaims |delta| of quota for |origin| and |type| pair.
     // Reserved quota should be counted as usage, but it should be on-memory
     // and be cleared by a browser restart.
@@ -55,15 +62,11 @@ class WEBKIT_STORAGE_BROWSER_EXPORT QuotaReservationManager {
                                   int64 delta,
                                   const StatusCallback& callback) = 0;
 
-    virtual void IncreaseDirtyCount(const GURL& origin,
+    virtual void IncrementDirtyCount(const GURL& origin,
                                     FileSystemType type) = 0;
-    virtual void DecreaseDirtyCount(const GURL& origin,
+    virtual void DecrementDirtyCount(const GURL& origin,
                                     FileSystemType type) = 0;
 
-   protected:
-    QuotaBackend() {}
-    virtual ~QuotaBackend() {}
-
    private:
     DISALLOW_COPY_AND_ASSIGN(QuotaBackend);
   };
@@ -98,17 +101,15 @@ class WEBKIT_STORAGE_BROWSER_EXPORT QuotaReservationManager {
                         int64 delta,
                         const StatusCallback& callback);
 
-  void IncreaseDirtyCount(const GURL& origin, FileSystemType type);
-  void DecreaseDirtyCount(const GURL& origin, FileSystemType type);
+  void IncrementDirtyCount(const GURL& origin, FileSystemType type);
+  void DecrementDirtyCount(const GURL& origin, FileSystemType type);
 
   scoped_refptr<QuotaReservationBuffer> GetReservationBuffer(
       const GURL& origin,
       FileSystemType type);
   void ReleaseReservationBuffer(QuotaReservationBuffer* reservation_pool);
 
-
-  // Not owned.  |backend_| should outlive QuotaReservationManager
-  QuotaBackend* backend_;
+  scoped_ptr<QuotaBackend> backend_;
 
   // Not owned.  The destructor of ReservationBuffer should erase itself from
   // |reservation_buffers_| by calling ReleaseReservationBuffer.