Move 'theme' parsing out of Extension class

chrome/utility/chrome_content_utility_client.cc

Index: chrome/utility/chrome_content_utility_client.cc
diff --git a/chrome/utility/chrome_content_utility_client.cc b/chrome/utility/chrome_content_utility_client.cc
index e372ebf76575309c91f351261406ffaa0eb4356f..643a37428006d285ea82f4293f6ef9e7fa546919 100644
--- a/chrome/utility/chrome_content_utility_client.cc
+++ b/chrome/utility/chrome_content_utility_client.cc
@@ -19,6 +19,9 @@
 #include "chrome/common/chrome_utility_messages.h"
 #include "chrome/common/extensions/extension.h"
 #include "chrome/common/extensions/extension_l10n_util.h"
+#include "chrome/common/extensions/extension_manifest_constants.h"
+#include "chrome/common/extensions/manifest_handler.h"
+#include "chrome/common/extensions/theme_handler.h"
 #include "chrome/common/extensions/unpacker.h"
 #include "chrome/common/extensions/update_manifest.h"
 #include "chrome/common/web_resource/web_resource_unpacker.h"
@@ -42,6 +45,16 @@
 #include "ui/gfx/gdi_util.h"
 #endif  // defined(OS_WIN)
 
+namespace {
+
+// Explicitly register all ManifestHandlers needed in the utility process.
+void RegisterExtensionManifestHandlers() {
+  extensions::ManifestHandler::Register(extension_manifest_keys::kTheme,
+                                        new extensions::ThemeHandler);
+}
+
+}  // namespace
+
 namespace chrome {
 
 ChromeContentUtilityClient::ChromeContentUtilityClient() {
@@ -116,6 +129,7 @@ void ChromeContentUtilityClient::OnUnpackExtension(
     int creation_flags) {
   CHECK(location > extensions::Extension::INVALID);
   CHECK(location < extensions::Extension::NUM_LOCATIONS);
+  RegisterExtensionManifestHandlers();
   extensions::Unpacker unpacker(
       extension_path,
       extension_id,