Devtools: Support disabling and enabling of debugger in TargetBreakpoints

LayoutTests/inspector/sources/debugger/breakpoint-manager.js

Index: LayoutTests/inspector/sources/debugger/breakpoint-manager.js
diff --git a/LayoutTests/inspector/sources/debugger/breakpoint-manager.js b/LayoutTests/inspector/sources/debugger/breakpoint-manager.js
index bf68d28b96350d20f1d15f351e6b0707c332555b..89950fe4302a5fc1693facceaacdf59a43eb1d84 100644
--- a/LayoutTests/inspector/sources/debugger/breakpoint-manager.js
+++ b/LayoutTests/inspector/sources/debugger/breakpoint-manager.js
@@ -41,6 +41,11 @@ InspectorTest.DebuggerModelMock.prototype = {
         return this._target;
     },
 
+    debuggerEnabled: function()
+    {
+        return true;
+    },
+
     _addScript: function(scriptId, url)
     {
         this._scripts[scriptId] = new WebInspector.Script(this._target, scriptId, url);