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

components/enhanced_bookmarks/image_store_unittest.cc

Index: components/enhanced_bookmarks/image_store_unittest.cc
diff --git a/components/enhanced_bookmarks/image_store_unittest.cc b/components/enhanced_bookmarks/image_store_unittest.cc
index 778c1e3e69886dc4e06415d3e87fcec5cea41128..7c78e9a09c7af7f37d26c771a348d85a25392db1 100644
--- a/components/enhanced_bookmarks/image_store_unittest.cc
+++ b/components/enhanced_bookmarks/image_store_unittest.cc
@@ -5,6 +5,7 @@
 #include "components/enhanced_bookmarks/image_store.h"
 
 #include "base/files/scoped_temp_dir.h"
+#include "base/strings/string_number_conversions.h"
 #include "components/enhanced_bookmarks/image_store_util.h"
 #include "components/enhanced_bookmarks/persistent_image_store.h"
 #include "components/enhanced_bookmarks/test_image_store.h"
@@ -218,4 +219,27 @@ TYPED_TEST(ImageStoreUnitTest, Persistence) {
   }
 }
 
+TYPED_TEST(ImageStoreUnitTest, GetSize) {
+  gfx::Image src_image = GenerateBlackImage();
+  const GURL url("foo://bar");
+  const GURL image_url("a.jpg");
+
+  int64 size = 0;
+  EXPECT_LE(this->store_->GetStoreSize(), 4096);
+  for (int i = 0; i < 100; ++i) {
+    this->store_->Insert(
+        GURL(url.spec() + '/' + base::IntToString(i)), image_url, src_image);
+    EXPECT_GE(this->store_->GetStoreSize(), size);
+    size = this->store_->GetStoreSize();
+  }
+
+  if (this->use_persistent_store()) {
+    EXPECT_GE(this->store_->GetStoreSize(), 100 * 1024); // 100kb
+    EXPECT_LE(this->store_->GetStoreSize(), 200 * 1024); // 200kb
+  } else {
+    EXPECT_GE(this->store_->GetStoreSize(), 400 * 1024); // 400kb
+    EXPECT_LE(this->store_->GetStoreSize(), 500 * 1024); // 500kb
+  }
+}
+
 }  // namespace