Bug 874213 - DeviceStorage: Add .default attribute to the device storage object. r=janv

dom/devicestorage/nsDeviceStorage.cpp

@@ -3057,6 +3057,14 @@ nsDOMDeviceStorage::GetRootDirectoryForFile(const nsAString& aName, nsIFile** aR
   return ds->mRootDirectory->Clone(aRootDirectory);
 }
 
+NS_IMETHODIMP
+nsDOMDeviceStorage::GetDefault(bool* aDefault) {
+  nsString defaultStorageName;
+  GetWritableStorageName(mStorageType, defaultStorageName);
+  *aDefault = mStorageName.Equals(defaultStorageName);
+  return NS_OK;
+}
+
 NS_IMETHODIMP
 nsDOMDeviceStorage::GetStorageName(nsAString& aStorageName)
 {

dom/interfaces/devicestorage/nsIDOMDeviceStorage.idl

@@ -11,7 +11,7 @@ interface nsIDOMDeviceStorageChangeEvent;
 interface nsIDOMEventListener;
 interface nsIFile;
 
-[scriptable, uuid(7cef14d4-d767-4da7-a18e-32c5e009a8e4), builtinclass]
+[scriptable, uuid(7c1b2305-0f14-4c07-8a8a-359eeb850068), builtinclass]
 interface nsIDOMDeviceStorage : nsIDOMEventTarget
 {
     [implicit_jscontext] attribute jsval onchange;
@@ -30,5 +30,9 @@ interface nsIDOMDeviceStorage : nsIDOMEventTarget
     // include any path information.
     readonly attribute DOMString storageName;
 
+    // Determines if this storage area is the one which will be used by default
+    // for storing new files.
+    readonly attribute bool default;
+
     [noscript] nsIFile getRootDirectoryForFile(in DOMString aName);
 };