Split web_view_internal_api and move part of it to extensions.

extensions/common/api/_api_features.json

Index: extensions/common/api/_api_features.json
diff --git a/extensions/common/api/_api_features.json b/extensions/common/api/_api_features.json
index af4e4b4e0c8f57410165540186783e5e7c0833a0..929ea424f126d2b72f0aaaad2cc0a813448845ea 100644
--- a/extensions/common/api/_api_features.json
+++ b/extensions/common/api/_api_features.json
@@ -210,5 +210,34 @@
   "usbPrivate": {
     "channel": "dev",
     "contexts": ["webui"]
-  }
+  },
+  "webViewExperimentalInternal": [{
+    "internal": true,
+    "channel": "dev",
+    "contexts": ["blessed_extension"],
+    "dependencies": ["permission:webview"]
+  },
+  {
+    "internal": true,
+    "channel": "stable",
+    "contexts": ["blessed_extension"],
+    "dependencies": ["permission:webview"],
+    "whitelist": [
+      "8C3741E3AF0B93B6E8E0DDD499BB0B74839EA578",
+      "E703483CEF33DEC18B4B6DD84B5C776FB9182BDB",
+      "1A26E32DE447A17CBE5E9750CDBA78F58539B39C",
+      "59048028102D7B4C681DBC7BC6CD980C3DC66DA3"
+    ]
+  }],
+  "webViewInternal": [{
+    "internal": true,
+    "dependencies": ["permission:webview"],
+    "contexts": ["blessed_extension"]
+  }, {
+    // Component extensions can use the webViewInternal API from iframes.
+    "location": "component",
+    "internal": true,
+    "dependencies": ["permission:webview"],
+    "contexts": ["unblessed_extension"]
+  }]
 }