Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-central/rev/0c335f8d3b38
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #27976 from etiennesegonzac/bug-1117444

Bug 1117444 - improve app->homescreen performance r=alive, cwiiis

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https://hg.mozilla.org/integration/gaia-central/rev/eb0e46092d55
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Bug 1117444 - Improve app->homescreen performance r=alive, cwiiis
* set overflow:hidden on the homescreen when hidden
* batch AppWindow#setVisible calls

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "0e5c608dc8dd1f8f9230825750e92c728ba28a98", 
+        "git_revision": "d56735ed3fdb925357431ef3808e66b1228f9c25", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "d061f6821a791a3caba2c1119634ba5285696a13", 
+    "revision": "0c335f8d3b381680e0ea223dd2d55cc5a59e8752", 
     "repo_path": "integration/gaia-central"
 }