Split bundle generation steps so that API registration is generated in browser, not common.

extensions/shell/common/api/schemas.gypi

Index: extensions/shell/common/api/schemas.gypi
diff --git a/extensions/shell/common/api/schemas.gypi b/extensions/shell/common/api/schemas.gypi
new file mode 100644
index 0000000000000000000000000000000000000000..67d577930b70a2fe885c031f31b81a69db46c0cc
--- /dev/null
+++ b/extensions/shell/common/api/schemas.gypi
@@ -0,0 +1,23 @@
+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+{
+  'sources': [
+    '<@(schema_files)',
+  ],
+  'variables': {
+    'chromium_code': 1,
+    'non_compiled_schema_files': [
+    ],
+    'schema_files': [
+      'shell.idl',
+    ],
+    'cc_dir': 'extensions/shell/common/api',
+    'root_namespace': 'extensions::shell_api::%(namespace)s',
+    'impl_dir_': 'extensions/shell/browser/api',
+  },
+  'dependencies': [
+    '<(DEPTH)/skia/skia.gyp:skia',
+  ],
+}