[Devtools] Support unicode assets in module build pipeline

Change-Id: I8a792b551e5fae1c381d1018d7f71d19692a71a9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1584569Reviewed-by: Paul Irish <paulirish@chromium.org>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Commit-Queue: Paul Irish <paulirish@chromium.org>
Cr-Commit-Position: refs/heads/master@{#654605}

third_party/blink/renderer/devtools/scripts/build/build_release_applications.py

@@ -184,7 +184,8 @@ class ReleaseBuilder(object):
         for resource_name in resource_names:
             resource_name = path.normpath(resource_name).replace('\\', '/')
             output.write('Runtime.cachedResources["%s"] = "' % resource_name)
-            resource_content = read_file(path.join(self.application_dir, resource_name)) + resource_source_url(resource_name)
+            resource_content = read_file(path.join(self.application_dir, resource_name))
+            resource_content += resource_source_url(resource_name).encode('utf-8')
             resource_content = resource_content.replace('\\', '\\\\')
             resource_content = resource_content.replace('\n', '\\n')
             resource_content = resource_content.replace('"', '\\"')