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

components/enhanced_bookmarks/test_image_store.cc

 // 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.
 
 #include "components/enhanced_bookmarks/test_image_store.h"
 
+#include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/gfx/geometry/size.h"
 #include "url/gurl.h"
 
 TestImageStore::TestImageStore() {
 }
 
 bool TestImageStore::HasKey(const GURL& page_url) {
   DCHECK(sequence_checker_.CalledOnValidSequencedThread());
 
   return store_.find(page_url) != store_.end();
@@ skipping 44 matching lines @@
   for (ImageMap::const_iterator it = store_.begin(); it != store_.end(); ++it)
     urls->insert(it->first);
 }
 
 void TestImageStore::ClearAll() {
   DCHECK(sequence_checker_.CalledOnValidSequencedThread());
 
   store_.clear();
 }
 
+int64 TestImageStore::GetStoreSize() {
+  // Not 100% accurate, but it's for testing so the actual value is not
+  // important.
+  int64 size = sizeof(store_);
+  for (ImageMap::const_iterator it = store_.begin(); it != store_.end(); ++it) {
+    size += sizeof(it->first);
+    size += it->first.spec().length();
+    size += sizeof(it->second);
+    SkBitmap bitmap = it->second.first.AsBitmap();
+    size += bitmap.width() * bitmap.height() * bitmap.bytesPerPixel();
+    size += it->second.second.spec().length();
+  }
+  return size;
+}
+
 TestImageStore::~TestImageStore() {
   DCHECK(sequence_checker_.CalledOnValidSequencedThread());
 }