Add a webstore API for installing bundles of extensions.

chrome/common/extensions/api/webstorePrivate.json

 [
   {
     "namespace":"webstorePrivate",
     "nodoc": "true",
     "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": {
+              "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."
+                }
+              }
+            }
+          },
+          {
+            "name": "callback",
+            "type": "function",
+            "description": "Called when the install process completes. Upon failures, chrome.extension.lastError will be set to 'user_canceled' or 'unknown_error'.",
+            "optional": "true",
+            "parameters": []
+          }
+        ]
+      },
+      {
         "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 179 matching lines @@
                 "type": "string",
                 "enum": ["webgl_allowed", "webgl_blocked"]
               }
             ]
           }
         ]
       }
     ]
   }
 ]