[view-compiler] Add layout validation

Layout validation walks over a layout resource and verifies that the layout only
uses features the layout compiler supports.

Currently this means we reject layouts that use any of the following tags:
  * include
  * fragment
  * merge
  * view

In the future, we will extend the layout compiler to handle these, but for now
we want to be liberal in what we reject.

Bug: 111895153
Test: atest view-compiler-tests
Change-Id: I8dca30c035a83b6763497a36fc60c68438fa1b0c
diff --git a/startop/view_compiler/Android.bp b/startop/view_compiler/Android.bp
index de40e0d..91cec554 100644
--- a/startop/view_compiler/Android.bp
+++ b/startop/view_compiler/Android.bp
@@ -24,6 +24,9 @@
         "libdexfile",
         "slicer",
     ],
+    static_libs: [
+        "libtinyxml2",
+    ],
 }
 
 cc_library_host_static {
@@ -32,7 +35,9 @@
     srcs: [
         "dex_builder.cc",
         "java_lang_builder.cc",
+        "tinyxml_layout_parser.cc",
         "util.cc",
+        "layout_validation.cc",
     ],
 }
 
@@ -43,7 +48,6 @@
         "main.cc",
     ],
     static_libs: [
-        "libtinyxml2",
         "libgflags",
         "libviewcompiler",
     ],
@@ -54,6 +58,7 @@
     defaults: ["viewcompiler_defaults"],
     srcs: [
         "dex_builder_test.cc",
+        "layout_validation_test.cc",
         "util_test.cc",
     ],
     static_libs: [