Implementation of getCurrentProxySettings for proxy settings API.

chrome/common/extensions/api/extension_api.json

 [
   {
     "namespace": "extension",
     "unprivileged": true,
     "types": [
       {
         "id": "MessageSender",
         "type": "object",
         "description": "An object containing information about the script context that sent a message or request.",
         "properties": {
@@ skipping 3717 matching lines @@
     ]
   },
   {
     "namespace": "experimental.proxy",
     "types": [
       {
         "id": "ProxyServer",
         "type": "object",
         "description": "An object encapsulating a single proxy server's specification.",
         "properties": {
-          "scheme": {"type": "string", "optional": true, "enum": ["http", "socks", "socks4", "socks5"], "description": "The scheme (protocol) of the proxy server itself."},
+          "scheme": {"type": "string", "optional": true, "enum": ["http", "https", "socks", "socks4", "socks5"], "description": "The scheme (protocol) of the proxy server itself."},
           "host": {"type": "string", "description": "The URI of the proxy server."},
           "port": {"type": "integer", "optional": true, "description": "The port of the proxy server."}
         }
       },
       {
         "id": "ProxyRules",
         "type": "object",
         "description": "An object encapsulating the set of proxy rules for all protocols. Use either 'singleProxy' or (a subset of) 'proxyForHttp', 'proxyForHttps', 'proxyForFtp' and 'socksProxy'.",
         "properties": {
           "singleProxy": {"$ref": "ProxyServer", "optional": true, "description": "The proxy server to be used for all per-URL requests (i.e., http, https, and ftp)."},
@@ skipping 49 matching lines @@
         "type": "function",
         "description": "Remove a custom proxy set by the current extension. This is the inverse of useCustomProxySettings.",
         "parameters": [
           {
             "name": "incognito",
             "type": "boolean",
             "description": "See incognito parameter of useCustomProxySettings.",
             "optional": true
           }
         ]
+      },
+      {
+        "name": "getCurrentProxySettings",
+        "type": "function",
+        "description": "Returns the currently effective proxy settings. These can originate from default values, command line options, the extension settings API, policies and possibly other sources in the future.",
+        "parameters": [
+          {
+            "name": "incognito",
+            "type": "boolean",
+            "description": "See incognito parameter of useCustomProxySettings."
+          },
+          {
+            "name": "callback",
+            "type": "function",
+            "parameters": [
+              {
+                "name": "config",
+                "$ref": "ProxyConfig",
+                "description": "Configuration, not necessarily a literal copy of the configuration passed to useCustomProxySettings."
+              }
+            ]
+          }
+        ]
       }
     ]
   },
   {
     "namespace": "experimental.clipboard",
     "types": [],
     "functions": [
       {
         "name": "executeCopy",
         "type": "function",
@@ skipping 706 matching lines @@
                   "token": { "type": "string", "optional": true }
                 }
               }
             ]
           }
         ]
       }
     ]
   }
 ]