DevTools: Implement debugger pause-resume through an action

Source/devtools/front_end/sources/module.json

 {
     "extensions": [
         {
             "type": "@WebInspector.Panel",
             "name": "sources",
             "title": "Sources",
             "order": 2,
             "className": "WebInspector.SourcesPanel"
         },
         {
             "type": "@WebInspector.ContextMenu.Provider",
             "contextTypes": ["WebInspector.UISourceCode", "WebInspector.RemoteObject"],
             "className": "WebInspector.SourcesPanel.ContextMenuProvider"
         },
         {
+            "type": "@WebInspector.ActionDelegate",
+            "actionId": "debugger.toggle-pause",
+            "className": "WebInspector.SourcesPanel.TogglePauseActionDelegate",
+            "contextTypes": ["WebInspector.SourcesPanel", "WebInspector.ShortcutRegistry.ForwardedShortcut"],
+            "bindings": [
+                {
+                    "platform": "windows,linux",
+                    "shortcut": "F8 Ctrl+\\"
+                },
+                {
+                    "platform": "mac",
+                    "shortcut": "F8 Meta+\\"
+                }
+            ]
+        },
+        {
             "type": "@WebInspector.SearchScope",
             "className": "WebInspector.SourcesSearchScope"
         },
         {
             "type": "@WebInspector.DrawerEditor",
             "className": "WebInspector.SourcesPanel.DrawerEditor"
         },
         {
             "type": "@WebInspector.Revealer",
             "contextTypes": ["WebInspector.UILocation"],
@@ skipping 122 matching lines @@
             "type": "ui-setting",
             "experiment": "frameworksDebuggingSupport",
             "parentSettingName": "skipStackFramesSwitch",
             "settingType": "custom",
             "className": "WebInspector.SourcesPanel.SkipStackFramePatternSettingDelegate"
         }
     ],
     "dependencies": [ "source_frame" ],
     "scripts": [ "SourcesPanel.js" ]
 }