manifest: add theme_color value to the manifest

content/browser/manifest/manifest_manager_host.cc

Index: content/browser/manifest/manifest_manager_host.cc
diff --git a/content/browser/manifest/manifest_manager_host.cc b/content/browser/manifest/manifest_manager_host.cc
index c22ae0ad46acfd1a4fd4c91c958e3325b55ce4e9..5ba50d0f6a3eb2b03cf835cdbb5904f2811591b8 100644
--- a/content/browser/manifest/manifest_manager_host.cc
+++ b/content/browser/manifest/manifest_manager_host.cc
@@ -136,6 +136,8 @@ void ManifestManagerHost::OnRequestManifestResponse(
                                    0, Manifest::kMaxIPCStringLength),
                                related_application.id.is_null());
   }
+  if (manifest.theme_color < 0 || manifest.theme_color > 0xFFFFFFFF)

[nasko, 2015/07/20 12:02:00]

Please add a comment giving a bit of background why this check is the right one
- color is only 32bit value and we only use the highest bit to communicate
parsing error.

+    manifest.theme_color = Manifest::kInvalidOrMissingThemeColor;
 
   callback->Run(manifest);
   callbacks->Remove(request_id);