Update license tool to check several additional directories

chrome/common/extensions/docs/examples/README.chromium

Index: chrome/common/extensions/docs/examples/README.chromium
diff --git a/chrome/common/extensions/docs/examples/README.chromium b/chrome/common/extensions/docs/examples/README.chromium
new file mode 100644
index 0000000000000000000000000000000000000000..fe01c3f45db367fd1682a93fd50837d0bc6c5df4
--- /dev/null
+++ b/chrome/common/extensions/docs/examples/README.chromium
@@ -0,0 +1,6 @@
+Name: Extensions examples
+URL: None
+License: Apache 2.0, MIT, X11, BSD, and GPL v2 licenses
+Security Critical: no
+
+The LICENSE file was generated from the licenses of all code in the examples.

[Steve Block, 2012/08/07 18:39:48]

I'd like to have the license tool check this directory so I don't have to
special-case it in the Android license tool -
http://codereview.chromium.org/10816041. This means I need to add a license
file, which will end up in about:credits.

The license tool currently prunes a bunch of third-party directories for code
like this that doesn't appear in the binary. However, there are plenty of cases
where we do provide license meta data for such code, so I assume it's OK to add
this LICENSE file?

[Nico, 2012/08/07 19:04:55]

It seems a bit silly if licenses for extensions example code show up in chrome's
about:credits. Is there no other way?