Add documentation for clipboardRead and clipboardWrite permissions.

chrome/common/extensions/docs/static/manifest.html

Index: chrome/common/extensions/docs/static/manifest.html
diff --git a/chrome/common/extensions/docs/static/manifest.html b/chrome/common/extensions/docs/static/manifest.html
index 12f0fabd1197b522df17883b86593dbf88ae9662..ab415dceb3d1631ad1c65f8b35c906f6fbd77ff7 100644
--- a/chrome/common/extensions/docs/static/manifest.html
+++ b/chrome/common/extensions/docs/static/manifest.html
@@ -367,6 +367,17 @@ but not any other permissions listed in this table.
        </td>
 </tr>
 <tr>
+  <td> "clipboardRead" </td>
+  <td> Required if the extension uses
+       <code>document.execCommand('paste')</code>. </td>
+</tr>
+<tr>
+  <td> "clipboardWrite" </td>
+  <td> Recommended if an extension uses
+       <code>document.execCommand('copy')</code> or
+       <code>document.execCommand('cut')</code>. Required for an app.</td>
+</tr>
+<tr>
   <td> "contextMenus" </td>
   <td> Required if the extension uses the
        <a href="contextMenus.html">chrome.contextMenus</a> module. </td>