Enforce the 'requirements' field in manifests.

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index 27200573a6fcd95534eca3d3f81563ecc94e7163..e93f90d20b2b99fb8a6c7da6b8b078c5c75fbac5 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -4815,6 +4815,15 @@ Update checks have repeatedly failed for the extension "<ph name="EXTENSION_NAME
       <message name="IDS_EXTENSION_CANT_DOWNGRADE_VERSION" desc="Error message when a user tries to install an extension with a lower version that a version that it already installed.">
         Attempted to downgrade extension.
       </message>
+      <message name="IDS_EXTENSION_WEBGL_NOT_SUPPORTED" desc="Error message when an extension has a requirement for WebGL that the system does not support.">
+        WebGL is not supported.
+      </message>
+      <message name="IDS_EXTENSION_CSS3D_NOT_SUPPORTED" desc="Error message when an extension has a requirement for CSS3d that the system does not support.">
+        CSS3d is not supported.
+      </message>
+      <message name="IDS_EXTENSION_NPAPI_NOT_SUPPORTED" desc="Error message when an extension has a requirement for plugins that the system does not support.">
+        NPAPI plugins are not supported.
+      </message>
       <message name="IDS_EXTENSION_CANT_INSTALL_BLACKLISTED" desc="Error message when a user tries to install an extension that is blacklisted.">
         This extension is blacklisted.
       </message>