Support chrome-extension:// scheme in URLPattern.

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

Index: chrome/common/extensions/docs/static/match_patterns.html
diff --git a/chrome/common/extensions/docs/static/match_patterns.html b/chrome/common/extensions/docs/static/match_patterns.html
index 871fcfafa05035ffe455545e92f160ff696064e0..5f493a79e0ccec1834182d2383fdef8ba9fcbb11 100644
--- a/chrome/common/extensions/docs/static/match_patterns.html
+++ b/chrome/common/extensions/docs/static/match_patterns.html
@@ -15,7 +15,8 @@ which URLs your content script affects.
 <p>
 A match pattern is essentially a URL
 that begins with a permitted scheme (<code>http</code>,
-<code>https</code>, <code>file</code>, or <code>ftp</code>),
+<code>https</code>, <code>file</code>, <code>ftp</code>, or
+<code>chrome-extension</code>),
 and that can contain '<code>*</code>' characters.
 The special pattern
 <code>&lt;all_urls&gt;</code> matches any URL
@@ -51,7 +52,7 @@ Each match pattern has 3 parts:</p>
 
 <pre>
 <em>&lt;url-pattern&gt;</em> := <em>&lt;scheme&gt;</em>://<em>&lt;host&gt;</em><em>&lt;path&gt;</em>
-<em>&lt;scheme&gt;</em> := '*' | 'http' | 'https' | 'file' | 'ftp'
+<em>&lt;scheme&gt;</em> := '*' | 'http' | 'https' | 'file' | 'ftp' | 'chrome-extension'
 <em>&lt;host&gt;</em> := '*' | '*.' <em>&lt;any char except '/' and '*'&gt;</em>+
 <em>&lt;path&gt;</em> := '/' <em>&lt;any chars&gt;</em>
 </pre>
@@ -186,6 +187,21 @@ The following table shows some valid patterns.
 
 <tr>
   <td>
+    <code>chrome-extension://*/* </code>
+  </td>
+
+  <td>
+    Matches any URL pointing to an extension (the first <code>*</code>
+    represents a filter for extension IDs, the second for paths).
+  </td>
+
+  <td>
+    chrome-extension://askla...asdf/options.html
+  </td>
+</tr>
+
+<tr>
+  <td>
     <code>&lt;all_urls&gt;</code>
   </td>
 
@@ -239,3 +255,7 @@ Here are some examples of <em>invalid</em> pattern matches:
 </tr>
 </tbody>
 </table>
+
+<p>
+Some schemes are not supported in all contexts.
+</p>