Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-central/rev/d2bc1987e88b
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #21473 from timdream/keyboard-multitouch-update

Bug 985855 - Commit first targets when there is a second press, r=rudyl

========

https://hg.mozilla.org/integration/gaia-central/rev/5a64d1aa9121
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 985855 - (Part III) Commit first targets when there is a second press

========

https://hg.mozilla.org/integration/gaia-central/rev/62045dbde987
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 985855 - (Part II) Count the number of touchstart events on a target

========

https://hg.mozilla.org/integration/gaia-central/rev/9b943a6fafc4
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 985855 - (Part I) Ensure active targets are always ended up committed

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "557dccc348a398fa9fcf8241bf24f52cf6b783f3", 
+    "revision": "d2bc1987e88b146a994f724b02eacd50dadb31b7", 
     "repo_path": "/integration/gaia-central"
 }