Add webstorePrivate API for installing bundles of extensions.

chrome/common/extensions/api/extension_api.json

 [
   {
     "namespace": "extension",
     "unprivileged": true,
     "types": [
       {
         "id": "MessageSender",
         "type": "object",
         "description": "An object containing information about the script context that sent a message or request.",
         "properties": {
@@ skipping 7798 matching lines @@
         "name": "onPlaylistChanged",
         "type": "function",
         "descrition": "Notifies that playlist content or state has been changed. Data could be retrieved via 'getPlaylist'.",
         "parameters": []
       }
     ]
   },
   {
     "namespace":"webstorePrivate",
     "nodoc": "true",
+    "types": [
+      {
+        "id": "BundleInstallDetails",
+        "type": "object",
+        "properties": {
+          "id": {
+            "type": "string",
+            "description": "The id of the extension to be installed.",
+            "minLength": 32,
+            "maxLength": 32
+          },
+          "manifest": {
+            "type": "string",
+            "description": "A string with the contents of the extension's manifest.json file. During the install process, the browser will check that the downloaded extension's manifest matches what was passed in here.",
+            "minLength": 1
+          },
+          "localizedName": {
+            "type": "string",
+            "description": "A string to use instead of the raw value of the 'name' key from manifest.json."
+          }
+        }
+      }
+    ],
     "functions": [
       {
         "name": "install",
         "description": "Installs the extension corresponding to the given id",
         "parameters": [
           {
             "name": "expected_id",
             "type": "string",
             "description": "The id of the extension to install."
           },
           {
             "name": "callback",
             "type": "function",
             "optional": "true",
             "parameters": []
           }
         ]
       },
       {
+        "name": "installBundle",
+        "description": "Initiates the install process for the given bundle of extensions.",
+        "parameters": [
+          {
+            "name": "details",
+            "description": "An array of extension details to be installed.",
+            "type": "array",
+            "items": { "$ref": "BundleInstallDetails" }
+          },
+          {
+            "name": "callback",
+            "type": "function",
+            "description": "Called when the install process completes.",
+            "optional": "true",
+            "parameters": [
+              {
+                "name": "result",
+                "type": "string",
+                "description": "A string result code, which will be empty upon success. The possible values in the case of errors include 'unknown_error', 'user_cancelled' and 'permission_denied'."
+              }
+            ]
+          }
+        ]
+      },
+      {
         "name": "beginInstallWithManifest3",
         "description": "Initiates the install process for the given extension.",
         "parameters": [
           {
             "name": "details",
             "type": "object",
             "properties": {
               "id": {
                 "type": "string",
                 "description": "The id of the extension to be installled.",
@@ skipping 40 matching lines @@
             "optional": "true",
             "parameters": [
               {
                 "name": "result",
                 "type": "string",
                 "description": "A string result code, which will be empty upon success. The possible values in the case of errors include 'unknown_error', 'user_cancelled', 'manifest_error', 'icon_error', 'invalid_id', 'permission_denied', and 'invalid_icon_url'."
               }
             ]
           }
         ]
-
       },
       {
         "name": "completeInstall",
         "description": "",
         "parameters": [
           {
             "name": "expected_id",
             "type": "string",
             "description": "The id of the extension to be installled. This should match a previous call to beginInstallWithManifest3."
           },
@@ skipping 1257 matching lines @@
                   }
                 }
               }
             ]
           }
         ]
       }
     ]
   }
 ]