Add namespace handling in attribute values

Previously, you could only reference namespace prefixes in attribute names:

<View xmlns:appcompat="http://schemas.android.com/apk/res/android.support.v7.appcompat"
      appcompat:name="hey"
      ...

Now you can also reference them in resource names within an attribute value:

      ...
      android:text="@appcompat:string/confirm"
      ...

Which will be treated as "@android.support.v7.appcompat:string/confirm".

Change-Id: Ib076e867a990c80cf877a704eb77cd1ef0b23b52
diff --git a/tools/aapt2/BindingXmlPullParser.cpp b/tools/aapt2/BindingXmlPullParser.cpp
index 58b96e8..4b7a656 100644
--- a/tools/aapt2/BindingXmlPullParser.cpp
+++ b/tools/aapt2/BindingXmlPullParser.cpp
@@ -252,6 +252,11 @@
     return mParser->getNamespaceUri();
 }
 
+bool BindingXmlPullParser::applyPackageAlias(std::u16string* package,
+                                             const std::u16string& defaultPackage) const {
+    return mParser->applyPackageAlias(package, defaultPackage);
+}
+
 const std::u16string& BindingXmlPullParser::getElementNamespace() const {
     return mParser->getElementNamespace();
 }