AAPT2: Add workaround for non-standard package IDs

The dynamic ref table used to map build-time IDs to runtime IDs
is mainly used for shared resource libraries and has a few built-in
mappings (app 0x7f and framework 0x01).

Using a non-standard package ID like 0x80 causes a failure in package ID
lookup. The solution is to ship the dynamic_ref_table with an identity mapping
with any resource table that uses a non-standard package ID.

Adds some tests to ensure this works correctly.

Bug: 37498913
Test: make libandroidfw_tests
Test: make aapt2_tests
Change-Id: Ic3f67942384d34e7fdcbc94ded360e940e3ebc8a
diff --git a/tools/aapt2/test/Context.h b/tools/aapt2/test/Context.h
index 29d1838..0564db0 100644
--- a/tools/aapt2/test/Context.h
+++ b/tools/aapt2/test/Context.h
@@ -52,15 +52,27 @@
     return compilation_package_.value();
   }
 
+  void SetCompilationPackage(const android::StringPiece& package) {
+    compilation_package_ = package.to_string();
+  }
+
   uint8_t GetPackageId() override {
     CHECK(bool(package_id_)) << "package ID not set";
     return package_id_.value();
   }
 
+  void SetPackageId(uint8_t package_id) {
+    package_id_ = package_id;
+  }
+
   NameMangler* GetNameMangler() override {
     return &name_mangler_;
   }
 
+  void SetNameManglerPolicy(const NameManglerPolicy& policy) {
+    name_mangler_ = NameMangler(policy);
+  }
+
   bool IsVerbose() override {
     return false;
   }