[DevTools] Introduce DOM capability.

third_party/WebKit/Source/devtools/front_end/sdk/Target.js

Index: third_party/WebKit/Source/devtools/front_end/sdk/Target.js
diff --git a/third_party/WebKit/Source/devtools/front_end/sdk/Target.js b/third_party/WebKit/Source/devtools/front_end/sdk/Target.js
index 6b8ca7053c4120d7780cf8ac5bbcc56979d2dec9..d36d8c10897c9cae966cd180361266fe84fe0c8b 100644
--- a/third_party/WebKit/Source/devtools/front_end/sdk/Target.js
+++ b/third_party/WebKit/Source/devtools/front_end/sdk/Target.js
@@ -36,6 +36,7 @@ WebInspector.Target.Capability = {
     JS: 2,
     Network: 4,
     Worker: 8,
+    DOM: 16
 }
 
 WebInspector.Target._nextId = 1;
@@ -135,6 +136,14 @@ WebInspector.Target.prototype = {
     },
 
     /**
+     * @return {boolean}
+     */
+    hasDOMCapability: function()
+    {
+        return this.hasAllCapabilities(WebInspector.Target.Capability.DOM);
+    },
+
+    /**
      * @return {?WebInspector.Target}
      */
     parentTarget: function()