Teach i18nTemplate.process() to handle <link rel=import> and <template>

ui/webui/resources/js/compiled_resources2.gyp

Index: ui/webui/resources/js/compiled_resources2.gyp
diff --git a/ui/webui/resources/js/compiled_resources2.gyp b/ui/webui/resources/js/compiled_resources2.gyp
index bdd520adea6f382f2a29163e60b83a2fc2489a42..2d0ce6627aedb5d2c80e025e02b8f908356b5232 100644
--- a/ui/webui/resources/js/compiled_resources2.gyp
+++ b/ui/webui/resources/js/compiled_resources2.gyp
@@ -42,12 +42,20 @@
     },
     {
       'target_name': 'i18n_template_no_process',
-      'dependencies': ['load_time_data'],
+      'dependencies': [
+        'load_time_data',
+        '<(EXTERNS_GYP):pending_compiler_externs',
+      ],
       'includes': ['../../../../third_party/closure_compiler/compile_js2.gypi'],
     },
     {
       'target_name': 'i18n_template',
-      'dependencies': ['load_time_data'],
+      'dependencies': [
+        'load_time_data',
+        # Ideally, <include> would automatically import externs as well, but
+        # it current doesn't and that sounds hard. Let's just kill <include>.
+        '<(EXTERNS_GYP):pending_compiler_externs',
+      ],
       'includes': ['../../../../third_party/closure_compiler/compile_js2.gypi'],
     },
   ],