Add GetStoreSize() to ImageStore to know the actual db size.

components/enhanced_bookmarks/test_image_store.h

 // Copyright 2014 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.
 
 #ifndef COMPONENTS_ENHANCED_BOOKMARKS_TEST_IMAGE_STORE_H_
 #define COMPONENTS_ENHANCED_BOOKMARKS_TEST_IMAGE_STORE_H_
 
 #include "components/enhanced_bookmarks/image_store.h"
 
 // The TestImageStore is an implementation of ImageStore that keeps all its
 // data in memory. When deallocated all the associations are lost.
 // Used in tests.
 class TestImageStore : public ImageStore {
  public:
   TestImageStore();
   virtual bool HasKey(const GURL& page_url) OVERRIDE;
   virtual void Insert(const GURL& page_url,
                       const GURL& image_url,
                       const gfx::Image& image) OVERRIDE;
   virtual void Erase(const GURL& page_url) OVERRIDE;
   virtual std::pair<gfx::Image, GURL> Get(const GURL& page_url) OVERRIDE;
   virtual gfx::Size GetSize(const GURL& page_url) OVERRIDE;
   virtual void GetAllPageUrls(std::set<GURL>* urls) OVERRIDE;
   virtual void ClearAll() OVERRIDE;
+  virtual int64 GetStoreSizeInBytes() OVERRIDE;
 
  protected:
   virtual ~TestImageStore();
 
  private:
   typedef std::map<const GURL, std::pair<gfx::Image, const GURL> > ImageMap;
   ImageMap store_;
 
   DISALLOW_COPY_AND_ASSIGN(TestImageStore);
 };
 
 #endif  // COMPONENTS_ENHANCED_BOOKMARKS_TEST_IMAGE_STORE_H_