Remove raw values from proto APK

Raw attribute values are not included in xml files when building binary
APKs but they are when building proto APKs. Remove raw attribute values
and create a new convert flag that (--keep-raw-values) that allows raw
value to be kept.

Also added flag to link to keep raw attribute values.

Bug: 115915884
Bug: 116700688
Test: aapt2_tests
Change-Id: Id50136b775b3f43d159ca06181282f6a7b8eaf40
diff --git a/tools/aapt2/cmd/Link.cpp b/tools/aapt2/cmd/Link.cpp
index 1b5601d..f5b7acf 100644
--- a/tools/aapt2/cmd/Link.cpp
+++ b/tools/aapt2/cmd/Link.cpp
@@ -1545,7 +1545,8 @@
   // to the IArchiveWriter.
   bool WriteApk(IArchiveWriter* writer, proguard::KeepSet* keep_set, xml::XmlResource* manifest,
                 ResourceTable* table) {
-    const bool keep_raw_values = context_->GetPackageType() == PackageType::kStaticLib;
+    const bool keep_raw_values = (context_->GetPackageType() == PackageType::kStaticLib)
+                                 || options_.keep_raw_values;
     bool result = FlattenXml(context_, *manifest, kAndroidManifestPath, keep_raw_values,
                              true /*utf16*/, options_.output_format, writer);
     if (!result) {