Fix bug where aapt2 optimize obfuscated color-* resources

aapt2 optimize --enable-resource-path-shortening should ignore res/color
resources since android uses the path while loading them. This cl fixes
a bug where res/color-* (eg: res/color-v21) resource paths are shortened
when they should not be.

Test: make aapt2_tests
Bug: b/75965637
Change-Id: Ibbc3fe4d2e6bd4f31765a5aa85980907dc013ecd
diff --git a/tools/aapt2/optimize/ResourcePathShortener.cpp b/tools/aapt2/optimize/ResourcePathShortener.cpp
index 845262b..6b11de7 100644
--- a/tools/aapt2/optimize/ResourcePathShortener.cpp
+++ b/tools/aapt2/optimize/ResourcePathShortener.cpp
@@ -23,6 +23,7 @@
 
 #include "ResourceTable.h"
 #include "ValueVisitor.h"
+#include "util/Util.h"
 
 
 static const std::string base64_chars =
@@ -95,8 +96,8 @@
     android::StringPiece res_subdir, actual_filename, extension;
     util::ExtractResFilePathParts(*file_ref->path, &res_subdir, &actual_filename, &extension);
 
-    // Android detects ColorStateLists via pathname, skip res/color/*
-    if (res_subdir == android::StringPiece("res/color/"))
+    // Android detects ColorStateLists via pathname, skip res/color*
+    if (util::StartsWith(res_subdir, "res/color"))
       continue;
 
     std::string shortened_filename = ShortenFileName(*file_ref->path, num_chars);
diff --git a/tools/aapt2/optimize/ResourcePathShortener_test.cpp b/tools/aapt2/optimize/ResourcePathShortener_test.cpp
index efbef8f..1f45694 100644
--- a/tools/aapt2/optimize/ResourcePathShortener_test.cpp
+++ b/tools/aapt2/optimize/ResourcePathShortener_test.cpp
@@ -75,6 +75,9 @@
   std::unique_ptr<ResourceTable> table =
       test::ResourceTableBuilder()
           .AddFileReference("android:color/colorlist", "res/color/colorlist.xml")
+          .AddFileReference("android:color/colorlist",
+                            "res/color-mdp-v21/colorlist.xml",
+                            test::ParseConfigOrDie("mdp-v21"))
           .Build();
 
   std::map<std::string, std::string> path_map;
@@ -82,6 +85,7 @@
 
   // Expect that the path map to not contain the ColorStateList
   ASSERT_THAT(path_map.find("res/color/colorlist.xml"), Eq(path_map.end()));
+  ASSERT_THAT(path_map.find("res/color-mdp-v21/colorlist.xml"), Eq(path_map.end()));
 }
 
 TEST(ResourcePathShortenerTest, KeepExtensions) {