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

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https://hg.mozilla.org/integration/gaia-central/rev/b328a35941a9
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Merge pull request #31027 from eeejay/bug-1184180

Bug 1184180 - Implement screen shade feature for screen reader. r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/2fab225981c0
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Bug 1184180 - Implement screen shade feature for screen reader.

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https://hg.mozilla.org/integration/gaia-central/rev/77b2cda58c92
Author: Ghislain 'Aus' Lacroix <aus@noiseport.org>
Desc: Merge pull request #31188 from nullaus/bug1174901

bug 1174901 - Insert debug logging, temporarily. r=me

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https://hg.mozilla.org/integration/gaia-central/rev/6d98629dd209
Author: Ghislain 'Aus' Lacroix <aus@mozilla.com>
Desc: bug 1174901 - Insert debug logging, temporarily. r=me

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "f69f5a8f5eac27b1d5a854cf6183f088714613b7", 
+        "git_revision": "8502d07cd7e68da79303471acf64eea48b3dce24", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "47a932e05a57035cfe6efccc93e8aabbf37172b0", 
+    "revision": "b328a35941a9934c652a2afbc064b69f23a35fc3", 
     "repo_path": "integration/gaia-central"
 }