AAPT2

First checking of AAPT2. The individual phases of AAPT2 work, but there
are some missing pieces.

For early testing we are missing:
- Need to properly mark file references and include them in package
- Need to package into zip

Final AAPT for apps we are missing:
- Need to crush PNGs
- Need to parse 9-patches
- Need to validate all of AndroidManifest.xml
- Need to write align method to align resource tables for splits.

Final AAPT for apps + system we are missing:
- Need to handle overlays
- Need to store comments for R file
- Need to handle --shared-lib (dynamic references too).

New AAPT features coming:
- Need to import compiled libraries
    - Name mangling
    - R file generation for library code

Change-Id: I95f8a63581b81a1f424ae6fb2c373c883b72c18d
diff --git a/tools/aapt2/SdkConstants.h b/tools/aapt2/SdkConstants.h
new file mode 100644
index 0000000..469c355
--- /dev/null
+++ b/tools/aapt2/SdkConstants.h
@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef AAPT_SDK_CONSTANTS_H
+#define AAPT_SDK_CONSTANTS_H
+
+#include "Resource.h"
+
+#include <string>
+
+namespace aapt {
+
+enum {
+    SDK_CUPCAKE = 3,
+    SDK_DONUT = 4,
+    SDK_ECLAIR = 5,
+    SDK_ECLAIR_0_1 = 6,
+    SDK_ECLAIR_MR1 = 7,
+    SDK_FROYO = 8,
+    SDK_GINGERBREAD = 9,
+    SDK_GINGERBREAD_MR1 = 10,
+    SDK_HONEYCOMB = 11,
+    SDK_HONEYCOMB_MR1 = 12,
+    SDK_HONEYCOMB_MR2 = 13,
+    SDK_ICE_CREAM_SANDWICH = 14,
+    SDK_ICE_CREAM_SANDWICH_MR1 = 15,
+    SDK_JELLY_BEAN = 16,
+    SDK_JELLY_BEAN_MR1 = 17,
+    SDK_JELLY_BEAN_MR2 = 18,
+    SDK_KITKAT = 19,
+    SDK_KITKAT_WATCH = 20,
+    SDK_LOLLIPOP = 21,
+    SDK_LOLLIPOP_MR1 = 22,
+};
+
+size_t findAttributeSdkLevel(const std::u16string& name);
+
+} // namespace aapt
+
+#endif // AAPT_SDK_CONSTANTS_H