initial version of the headless download manager delegate

third_party/WebKit/Source/core/inspector/browser_protocol.json

 {
     "version": { "major": "1", "minor": "2" },
     "domains": [{
         "domain": "Inspector",
         "experimental": true,
         "types": [],
         "commands": [
             {
                 "name": "enable",
                 "description": "Enables inspector domain notifications."
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             },
             {
                 "name": "getWindowBounds",
                 "description": "Get position and size of the browser window.",
                 "parameters": [
                     { "name": "windowId", "$ref": "WindowID", "description": "Browser window id." }
                 ],
                 "returns": [
                     { "name": "bounds", "$ref": "Bounds", "description": "Bounds information of the window. When window state is 'minimized', the restored window position and size are returned." }
                 ]
+            },
+            {
+                "name": "setDownloadBehavior",
+                "description": "Set the behavior when downloading a file (headless chrome only).",
+                "parameters": [
+                    { "name": "behavior", "type": "string", "enum": ["deny", "allow"], "description": "Whether to allow all or deny all download requests." }
+                ]
+            },
+            {
+                "name": "setDownloadDirectory",
+                "description": "Set the directory path where downloaded fles will be saved (headless chrome only).",
+                "parameters": [
+                    { "name": "path", "type": "string", "description": "The default path to save downloaded files to." }
+                ]
             }
         ]
     }]
 }