Add descriptions with examples to run-blink-* scripts.

third_party/WebKit/Tools/Scripts/run-blink-httpd

Index: third_party/WebKit/Tools/Scripts/run-blink-httpd
diff --git a/third_party/WebKit/Tools/Scripts/run-blink-httpd b/third_party/WebKit/Tools/Scripts/run-blink-httpd
index a3a01a4d5468999151a7e766f2c752de1b1fce67..5a725c3ebfe09ef44eb08eb9f5343dd43ce5b7ea 100755
--- a/third_party/WebKit/Tools/Scripts/run-blink-httpd
+++ b/third_party/WebKit/Tools/Scripts/run-blink-httpd
@@ -27,9 +27,21 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+"""Runs an Apache HTTP server to manually run layout tests locally.
+
+After running this script, you can locally navigate to URLS where

[dcheng, 2017/02/25 00:06:24]

Nit: URLs

[qyearsley, 2017/02/26 19:21:44]

Done

+the path is relative to LayoutTests/http/tests/. For example, to run
+LayoutTests/http/tests/cachestorage/window-cache-add.html, navigate to:
+    http://localhost:8000/cachestorage/window/cache-add.html

[dcheng, 2017/02/25 00:06:24]

I think this should be 127.0.0.1:8000, since some tests depend on the fact that
127.0.0.1 is cross-origin. For example, if I run

out/Release/content_shell --run-layout-test
http://localhost:8000/security/cross-frame-access-get.html

I get a ton of failures.

(https://cs.chromium.org/chromium/src/third_party/WebKit/Tools/Scripts/webkitp...
also seems to indicate this is the case)

[qyearsley, 2017/02/26 19:21:44]

Done

+
+When using HTTPS, for example:
+    https://localhost:8443/https/verify-ssl-enabled.php
+you will may a certificate warning, which you need to bypass.
+"""
+
 import webkitpy.common.version_check
 
 from webkitpy.layout_tests.servers import cli_wrapper
 from webkitpy.layout_tests.servers import apache_http
 
-cli_wrapper.main(apache_http.ApacheHTTP, additional_dirs={}, number_of_servers=4)
+cli_wrapper.main(apache_http.ApacheHTTP, additional_dirs={}, number_of_servers=4, description=__doc__)