Adds usage instrumentation for indexedDB
Includes new header file in project files

https://bugs.webkit.org/show_bug.cgi?id=107772

Patch by Kassy Coan <kassycoan@chromium.org> on 2013-02-03
Reviewed by Tony Chang.

Currently untestable. Has zero effect apart from histogramming.

* GNUmakefile.list.am:
* Modules/indexeddb/IDBDatabase.cpp:
(WebCore::IDBDatabase::createObjectStore):
(WebCore::IDBDatabase::deleteObjectStore):
(WebCore::IDBDatabase::transaction):
* Modules/indexeddb/IDBFactory.cpp:
(WebCore::IDBFactory::openInternal):
(WebCore::IDBFactory::deleteDatabase):
* Modules/indexeddb/IDBHistograms.h: Added.
(WebCore):
* Target.pri:
* WebCore.gypi:
* WebCore.vcproj/WebCore.vcproj:
* WebCore.xcodeproj/project.pbxproj:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@141735 268f45cc-cd09-0410-ab3c-d52691b4dbfc