Add two classes [as yet unused] needed for upcoming IDB Blob support.

Source/platform/exported/WebBlobInfo.cpp

Index: Source/platform/exported/WebBlobInfo.cpp
diff --git a/Source/modules/quota/StorageInfo.cpp b/Source/platform/exported/WebBlobInfo.cpp
similarity index 82%
copy from Source/modules/quota/StorageInfo.cpp
copy to Source/platform/exported/WebBlobInfo.cpp
index 0a51cee7fb5e6183740935885ccd792d1e347b97..0028330e8703f3a99fee77ef2906ea00e40b1c34 100644
--- a/Source/modules/quota/StorageInfo.cpp
+++ b/Source/platform/exported/WebBlobInfo.cpp
@@ -29,19 +29,17 @@
  */
 
 #include "config.h"
-#include "modules/quota/StorageInfo.h"
+#include "public/platform/WebBlobInfo.h"
 
-namespace WebCore {
+#include "platform/blob/BlobInfo.h"
 
-StorageInfo::StorageInfo(unsigned long long usage, unsigned long long quota)
-    : m_usage(usage)
-    , m_quota(quota)
-{
-    ScriptWrappable::init(this);
-}
+namespace blink {
 
-StorageInfo::~StorageInfo()
+WebBlobInfo::operator WebCore::BlobInfo() const
 {
+    if (isFile())
+        return WebCore::BlobInfo(uuid(), filePath(), fileName(), type(), lastModified(), size());
+    return WebCore::BlobInfo(uuid(), type(), size());
 }
 
-} // namespace WebCore
+} // namespace blink