[NaCl SDK] Add pepper_55 bundle.

native_client_sdk/src/build_tools/json/naclsdk_manifest2.json

Index: native_client_sdk/src/build_tools/json/naclsdk_manifest2.json
diff --git a/native_client_sdk/src/build_tools/json/naclsdk_manifest2.json b/native_client_sdk/src/build_tools/json/naclsdk_manifest2.json
index cedee3186be925d92f372312e87d33c86cb35e10..76f94882667e96253d1ab9c73d7255f625564806 100644
--- a/native_client_sdk/src/build_tools/json/naclsdk_manifest2.json
+++ b/native_client_sdk/src/build_tools/json/naclsdk_manifest2.json
@@ -94,6 +94,41 @@
       "version": 50
     },
     {
+      "archives": [
+        {
+          "checksum": {
+            "sha1": "8fa21433d946fb30666d29d9898ab91b6f0fb708"
+          },
+          "host_os": "linux",
+          "size": 332591654,
+          "url": "https://storage.googleapis.com/nativeclient-mirror/nacl/nacl_sdk/55.0.2879.2/naclsdk_linux.tar.bz2"
+        },
+        {
+          "checksum": {
+            "sha1": "6db864b3372ad98a46d6c6166f59c5cfa13f7a57"
+          },
+          "host_os": "mac",
+          "size": 322946452,
+          "url": "https://storage.googleapis.com/nativeclient-mirror/nacl/nacl_sdk/55.0.2879.2/naclsdk_mac.tar.bz2"
+        },
+        {
+          "checksum": {
+            "sha1": "0f562a6288c18459f4132c0a7dada147c588e8e9"
+          },
+          "host_os": "win",
+          "size": 318999883,
+          "url": "https://storage.googleapis.com/nativeclient-mirror/nacl/nacl_sdk/55.0.2879.2/naclsdk_win.tar.bz2"
+        }
+      ],
+      "description": "Chrome 55 bundle. Chrome revision: 2. NaCl revision: fe5bd51f9b79d27b2a3884181d4004cfccf70759",
+      "name": "pepper_55",
+      "recommended": "no",
+      "repath": "pepper_55",
+      "revision": 2,
+      "stability": "dev",
+      "version": 55
+    },
+    {
       "archives": [],
       "description": "Chrome Canary",
       "name": "pepper_canary",