[Extensions API] Remove inline enums

extensions/common/api/virtual_keyboard_private.json

Index: extensions/common/api/virtual_keyboard_private.json
diff --git a/extensions/common/api/virtual_keyboard_private.json b/extensions/common/api/virtual_keyboard_private.json
index 6bce48c778dfca13684ac2288c94cc5312f75cf6..d79e76a5984e1a4f6191b7928321823ce30c4a29 100644
--- a/extensions/common/api/virtual_keyboard_private.json
+++ b/extensions/common/api/virtual_keyboard_private.json
@@ -12,16 +12,34 @@
     "description": "none",
     "types": [
       {
+        "id": "VirtualKeyboardEventType",
+        "type": "string",
+        "description": "One of keyup or keydown.",
+        "enum": ["keyup", "keydown"]
+      },
+      {
         "id": "VirtualKeyboardEvent",
         "type": "object",
         "properties": {
-          "type": {"type": "string", "description": "One of keyup or keydown.", "enum": ["keyup", "keydown"]},
+          "type": {"$ref": "VirtualKeyboardEventType"},
           "charValue": {"type": "integer", "description": "Unicode value of the key."},
           "keyCode": {"type": "integer", "description": "Virtual key code, which is independent of the keyboard layout or modifier state."},
           "keyName": {"type": "string", "description": "Name of the key, which is independent of modifier state."},
           "modifiers": {"type": "integer", "optional": true, "description": "Flag for modifiers that are active. None = 0, Shift = 2, Control = 4, Alt = 8."}
         }
-      }
+      },
+      {
+        "id": "KeyboardMode",
+        "type": "string",
+        "enum": [ "FULL_WIDTH", "FLOATING" ],
+        "description": "The value of the virtual keyboard mode to set to."
+      },
+      {
+        "id": "OnTextInputBoxFocusedType",
+        "type": "string",
+        "description": "The value of type attribute of the focused text input box.",
+        "enum": ["text", "number", "password", "date", "url", "tel", "email"]
+       }
     ],
     "functions": [
       {
@@ -168,8 +186,7 @@
         "description": "Sets the virtual keyboard mode.",
         "parameters": [
           {
-            "type": "string",
-            "enum": [ "FULL_WIDTH", "FLOATING" ],
+            "$ref": "KeyboardMode",
             "name": "mode",
             "description": "The value of the virtual keyboard mode to set to."
           }
@@ -189,9 +206,8 @@
             "description": "Describes the text input box that has acquired focus. Note only the type of text input box is passed. This API is intended to be used by non-ime virtual keyboard only. Normal ime virtual keyboard should use chrome.input.ime.onFocus to get the more detailed InputContext.",
             "properties": {
               "type": {
-                "type": "string",
-                "description": "The value of type attribute of the focused text input box.",
-                "enum": ["text", "number", "password", "date", "url", "tel", "email"]
+                "$ref": "OnTextInputBoxFocusedType",
+                "description": "The value of type attribute of the focused text input box."
               }
             }
           }