[chrome.dial] Adds chrome.dial.fetchDeviceDecription API.

chrome/common/extensions/api/dial.idl

Index: chrome/common/extensions/api/dial.idl
diff --git a/chrome/common/extensions/api/dial.idl b/chrome/common/extensions/api/dial.idl
index d16fdfd6919ea8af27f36f817f86f8c4d509e738..927663b8fd00a9bb0a10c5fbce861fd8ecd9faff 100644
--- a/chrome/common/extensions/api/dial.idl
+++ b/chrome/common/extensions/api/dial.idl
@@ -21,6 +21,21 @@ namespace dial {
     long? configId;
   };
 
+  // Represents a device description resource successfully fetched from a
+  // DIAL device.
+  dictionary DialDeviceDescription {
+
+    // The label of the device that the description was fetched for.
+    DOMString deviceLabel;
+
+    // The contents of the Application-URL header in the response.
+    DOMString appUrl;
+
+    // The content of the response body.  This will be an XML document
+    // (hopefully) conforming to section 2.3 of the UPnP spec.
+    DOMString deviceDescription;
+  };
+
   enum DialErrorCode {
     no_listeners,
     no_valid_network_interfaces,
@@ -35,6 +50,7 @@ namespace dial {
   };
 
   callback BooleanCallback = void (boolean result);
+  callback DeviceDescriptionCallback = void (DialDeviceDescription result);
 
   interface Functions {
 
@@ -43,6 +59,16 @@ namespace dial {
     // callback is invoked with |true| if discovery was initiated or |false|
     // otherwise.
     static void discoverNow(BooleanCallback callback);
+
+    // Fetches the device description for the DIAL device identified by
+    // |deviceLabel|.  If successful, the callback is invoked with a
+    // DialDeviceDescription containing the content of the device description.
+    //
+    // If unsuccessful, callback is invoked with |null| and lastError is set
+    // to an error message.  If the error occurred during the HTTP fetch itself,
+    // the message will begin "HTTP XXX:" where XXX is the HTTP result code.

[imcheng, 2016/12/28 05:36:45]

... begin with

[mark a. foltz, 2017/01/04 00:20:16]

Done.

+    static void fetchDeviceDescription(DOMString deviceLabel,
+                                       DeviceDescriptionCallback callback);
   };
 
   interface Events {