Web Inspector: console should show an icon for console.info() messages

Web Inspector: console should show an icon for console.info() messages
https://bugs.webkit.org/show_bug.cgi?id=18530

Reviewed by Timothy Hatcher.

Source/JavaScriptCore:

* inspector/ConsoleMessage.cpp:
(Inspector::messageLevelValue):
* inspector/protocol/Console.json:
* runtime/ConsoleClient.cpp:
(JSC::appendMessagePrefix):
* runtime/ConsolePrototype.cpp:
(JSC::ConsolePrototype::finishCreation):
(JSC::consoleProtoFuncInfo):
* runtime/ConsoleTypes.h:

Source/WebInspectorUI:

Added icons for console.log, console.info and console.debug messages.

Separated console.info from console.log.

* UserInterface/Images/Debug.svg: Added.
* UserInterface/Images/Info.svg: Added.
* UserInterface/Images/Log.svg: Added.
New icon files.

* UserInterface/Models/ConsoleMessage.js:
* UserInterface/Views/ConsoleMessageView.css:
(.console-log-level::before):
(.console-info-level::before):
(.console-debug-level::before):
(:matches(.console-warning-level, .console-error-level, .console-log-level, .console-info-level, .console-debug-level).console-message):
(:matches(.console-warning-level, .console-error-level, .console-log-level, .console-info-level, .console-debug-level)::before):
(:matches(.console-warning-level, .console-error-level, .console-log-level).console-message): Deleted.
(:matches(.console-warning-level, .console-error-level, .console-log-level)::before): Deleted.
Include console.info messages in layout adjustments.

* UserInterface/Views/ConsoleMessageView.js:
(WebInspector.ConsoleMessageView):
(WebInspector.ConsoleMessageView.prototype._levelString):

Source/WebKit/mac:

* WebCoreSupport/WebChromeClient.mm:
(stringForMessageLevel):
* WebView/WebUIDelegatePrivate.h:

LayoutTests:

* inspector/console/console-api-expected.txt:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@183659 268f45cc-cd09-0410-ab3c-d52691b4dbfc