Enable syntax highlighting for Go.

Interestingly enough there was already an entry for go in
mime-types.properties.

Change-Id: Ibf4742cbab1e18370a88616fd857eb133405b4f6
Signed-off-by: Dan Albert <danalbert@google.com>

gerrit-gwtui/src/main/java/net/codemirror/mode/ModeInfo.java

@@ -51,6 +51,7 @@ public class ModeInfo extends JavaScriptObject {
       Modes.I.gas(),
       Modes.I.gerrit_commit(),
       Modes.I.gfm(),
+      Modes.I.go(),
       Modes.I.groovy(),
       Modes.I.haskell(),
       Modes.I.htmlmixed(),

gerrit-gwtui/src/main/java/net/codemirror/mode/Modes.java

@@ -36,6 +36,7 @@ public interface Modes extends ClientBundle {
   @Source("gas.js") @DoNotEmbed DataResource gas();
   @Source("gerrit/commit.js") @DoNotEmbed DataResource gerrit_commit();
   @Source("gfm.js") @DoNotEmbed DataResource gfm();
+  @Source("go.js") @DoNotEmbed DataResource go();
   @Source("groovy.js") @DoNotEmbed DataResource groovy();
   @Source("haskell.js") @DoNotEmbed DataResource haskell();
   @Source("htmlmixed.js") @DoNotEmbed DataResource htmlmixed();

lib/codemirror/cm.defs

@@ -53,6 +53,7 @@ CM_MODES = [
   'erlang',
   'gas',
   'gfm',
+  'go',
   'groovy',
   'haskell',
   'htmlmixed',