New C++ -> Java enum build rule + parser/generator.

ui/android/BUILD.gn

Index: ui/android/BUILD.gn
diff --git a/ui/android/BUILD.gn b/ui/android/BUILD.gn
index 875815d1305d8f91715c810843480a898071a5ff..fb6938800cad09da3955ca3c5872d2c1b7e57d32 100644
--- a/ui/android/BUILD.gn
+++ b/ui/android/BUILD.gn
@@ -2,23 +2,21 @@ import("//build/config/android/rules.gni")
 
 assert(is_android)
 
-java_cpp_template("window_open_disposition_srcjar") {
-  package_name = "org/chromium/ui"
+java_cpp_enum("window_open_disposition_srcjar") {
   sources = [
-    "java/WindowOpenDisposition.template",
+    "../base/window_open_disposition.h",
   ]
-  inputs = [
-    "../base/window_open_disposition_list.h"
+  outputs = [
+    "org/chromium/ui/WindowOpenDisposition.java",
   ]
 }
 
-java_cpp_template("bitmap_format_srcjar") {
-  package_name = "org/chromium/ui/gfx"
+java_cpp_enum("bitmap_format_srcjar") {
   sources = [
-    "java/BitmapFormat.template",
+    "../gfx/android/java_bitmap.h"
   ]
-  inputs = [
-    "../gfx/android/bitmap_config_list.h"
+  outputs = [
+    "org/chromium/ui/gfx/BitmapFormat.java",
   ]
 }