[Rietveld] Add support for patchset dependencies

appengine/chromium_rietveld/new_static/components/cr-issue-patchset.css

Index: appengine/chromium_rietveld/new_static/components/cr-issue-patchset.css
diff --git a/appengine/chromium_rietveld/new_static/components/cr-issue-patchset.css b/appengine/chromium_rietveld/new_static/components/cr-issue-patchset.css
index fe44a0eec4af9186b343f0183da89fcb50828c0c..f67e281584ff81c6a7114bf02b57ff81d5dbac11 100644
--- a/appengine/chromium_rietveld/new_static/components/cr-issue-patchset.css
+++ b/appengine/chromium_rietveld/new_static/components/cr-issue-patchset.css
@@ -58,6 +58,26 @@ header .ui-actions {
     margin: 0.5em 16px 0.5em 16px;
 }
 
+.view-depends-on-patchset {
+    margin: 0 5px 0.5em 16px;
+}
+
+#depends-on-patchset h2 {
+    margin: 0.5em 16px 0.5em 16px;
+}
+
+.view-dependent-patchsets {
+    margin: 0 5px 0.5em 16px;
+}
+
+#dependent-patchsets h2 {
+    margin: 0.5em 16px 0.5em 16px;
+}
+
+.linethrough {
+    text-decoration: line-through;
+}
+
 .spinner {
     vertical-align: middle;
     margin: 0 8px 0 8px;