Generate ChromeVersionConstants.java at build time.

build/android/java_cpp_template.gypi

Index: build/android/java_cpp_template.gypi
diff --git a/build/android/java_cpp_template.gypi b/build/android/java_cpp_template.gypi
index fe4238af84fd700979748a2d62bba311d4fc5435..036f32cf5af67e805edf7c710bdfd4b178bad3e1 100644
--- a/build/android/java_cpp_template.gypi
+++ b/build/android/java_cpp_template.gypi
@@ -22,8 +22,8 @@
 #
 # The 'sources' entry should only list template file. The template file
 # itself should use the 'ClassName.template' format, and will generate
-# 'gen/templates/<package-name>/ClassName.java. The files which template
-# dependents on and typically included by the template should be listed
+# 'gen/templates/<target-name>/<package-name>/ClassName.java. The files which
+# template dependents on and typically included by the template should be listed
 # in template_deps variables. Any change to them will force a rebuild of
 # the template, and hence of any source that depends on it.
 #
@@ -32,7 +32,7 @@
   # Location where all generated Java sources will be placed.
   'variables': {
     'include_path%': '<(DEPTH)',
-    'output_dir': '<(SHARED_INTERMEDIATE_DIR)/templates/<(package_name)',
+    'output_dir': '<(SHARED_INTERMEDIATE_DIR)/templates/<(_target_name)/<(package_name)',
   },
   'direct_dependent_settings': {
     'variables': {