Use PreloadCheckGroup in ExtensionInstallChecker. Make RequirementsChecker a PreloadCheck.

extensions/strings/extensions_strings.grd

Index: extensions/strings/extensions_strings.grd
diff --git a/extensions/strings/extensions_strings.grd b/extensions/strings/extensions_strings.grd
index bc58dba0736bc60ce526a4e00105f93aa3c58529..376044fd6040b03f88544dd410a1311ff2f06702 100644
--- a/extensions/strings/extensions_strings.grd
+++ b/extensions/strings/extensions_strings.grd
@@ -308,6 +308,11 @@
       <message name="IDS_EXTENSION_INSTALL_PROCESS_CRASHED" desc="Error message in case package fails to install because a utility process crashed.">
         Could not install package because a utility process crashed. Try restarting Chrome and trying again.
       </message>
+      <if expr="is_posix and not is_macosx">
+        <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>
+      </if>
       <message name="IDS_EXTENSION_PACKAGE_ERROR_CODE" desc="Error message in cases where we fail to install the extension because the crx file is invalid. For example, because the crx header or signature is invalid.">
         Package is invalid: '<ph name="ERROR_CODE">$1<ex>error</ex></ph>'.
       </message>
@@ -327,6 +332,14 @@
           Can not unpack extension.  To safely unpack an extension, there must be a path to your profile directory that does not contain a symlink.  No such path exists for your profile.
         </message>
       </if>
+      <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>
+      <if expr="not use_aura">
+        <message name="IDS_EXTENSION_WINDOW_SHAPE_NOT_SUPPORTED" desc="Error message when an extension has a requirement for shaped windows that the system does not support.">
+          Shaped windows are not supported.
+        </message>
+      </if>
 
       <!-- Utility process names. Please keep alphabetized. -->
       <message name="IDS_UTILITY_PROCESS_EXTENSION_UNPACKER_NAME" desc="The name of the utility process used for unpacking extensions.">