AAPT2: Fix product support

Previously the default product wasn't tried if 'default' wasn't specified on the command line.
Also adds support for multiple products.

Change-Id: I1e4872b34bb8d609b6444841a4e7e4dbb3bbb76b
diff --git a/tools/aapt2/compile/Compile.cpp b/tools/aapt2/compile/Compile.cpp
index 967e236..b3b0f65 100644
--- a/tools/aapt2/compile/Compile.cpp
+++ b/tools/aapt2/compile/Compile.cpp
@@ -105,7 +105,7 @@
 struct CompileOptions {
     std::string outputPath;
     Maybe<std::string> resDir;
-    Maybe<std::u16string> product;
+    std::vector<std::u16string> products;
     bool pseudolocalize = false;
     bool verbose = false;
 };
@@ -191,7 +191,7 @@
         xml::XmlPullParser xmlParser(fin);
 
         ResourceParserOptions parserOptions;
-        parserOptions.product = options.product;
+        parserOptions.products = options.products;
 
         // If the filename includes donottranslate, then the default translatable is false.
         parserOptions.translatable = pathData.name.find(u"donottranslate") == std::string::npos;
@@ -430,10 +430,11 @@
 int compile(const std::vector<StringPiece>& args) {
     CompileOptions options;
 
-    Maybe<std::string> product;
+    Maybe<std::string> productList;
     Flags flags = Flags()
             .requiredFlag("-o", "Output path", &options.outputPath)
-            .optionalFlag("--product", "Product type to compile", &product)
+            .optionalFlag("--product", "Comma separated list of product types to compile",
+                          &productList)
             .optionalFlag("--dir", "Directory to scan for resources", &options.resDir)
             .optionalSwitch("--pseudo-localize", "Generate resources for pseudo-locales "
                             "(en-XA and ar-XB)", &options.pseudolocalize)
@@ -442,8 +443,10 @@
         return 1;
     }
 
-    if (product) {
-        options.product = util::utf8ToUtf16(product.value());
+    if (productList) {
+        for (StringPiece part : util::tokenize<char>(productList.value(), ',')) {
+            options.products.push_back(util::utf8ToUtf16(part));
+        }
     }
 
     CompileContext context;