Web Inspector: Add InspectorFrontendHost.debuggableType to let the frontend know it's backend is JavaScript or Web
https://bugs.webkit.org/show_bug.cgi?id=126016

Patch by Joseph Pecoraro <pecoraro@apple.com> on 2013-12-19
Reviewed by Timothy Hatcher.

Source/JavaScriptCore:

* inspector/remote/RemoteInspector.mm:
(Inspector::RemoteInspector::listingForDebuggable):
* inspector/remote/RemoteInspectorConstants.h:
Include a debuggable type identifier in the debuggable listing,
so the remote frontend can know if it is debugging a Web Page
or JS Context.

Source/WebCore:

* inspector/InspectorFrontendHost.cpp:
(WebCore::InspectorFrontendHost::debuggableType):
* inspector/InspectorFrontendHost.h:
* inspector/InspectorFrontendHost.idl:
Expose the debuggableType to the frontend. In WebCore it is always a "web" type.

Source/WebInspectorUI:

* UserInterface/LoadInspectorBackendCommands.js:
If the debuggable target is "web" load both JS and Web backend commands.
Otherwise, we only load the default, js backend commands.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@160887 268f45cc-cd09-0410-ab3c-d52691b4dbfc