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+// Copyright 2019 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+module js_injection.mojom;
+
+import "components/js_injection/common/origin_matcher.mojom";
+import "mojo/public/mojom/base/string16.mojom";
+import "third_party/blink/public/mojom/messaging/message_port_descriptor.mojom";
+
+// JsObject struct represents a JavaScript object we will inject in the main
+// JavaScript world of a frame. |js_object_name| will be used as the name
+// of the JavaScript object. We will inject the object if the frame's origin
+// matches |origin_matcher|. |js_to_browser_messaging| will be used for that
+// JavaScript object to send message back to browser side.
+struct JsObject {
+  mojo_base.mojom.String16 js_object_name;
+  pending_associated_remote<JsToBrowserMessaging> js_to_browser_messaging;
+  js_injection.mojom.OriginMatcher origin_matcher;
+};
+
+// DocumentStartJavaScript struct contains the JavaScript snippet |script| and
+// the corresponding |origin_matcher|. We will run the script if the frame's
+// origin matches any rules in the |origin_matcher|.
+struct DocumentStartJavaScript {
+  int32 script_id;
+  mojo_base.mojom.String16 script;
+  js_injection.mojom.OriginMatcher origin_matcher;
+};
+
+// For JavaScript postMessage() API, implemented by browser.
+interface JsToBrowserMessaging {
+  // Called from renderer, browser receives |message| and possible |ports|,
+  // The |message| is an opaque type and the contents are defined by the client
+  // of this API.
+  PostMessage(mojo_base.mojom.String16 message,
+              array<blink.mojom.MessagePortDescriptor> ports);
+
+  // When there is a new BrowserToJsMessaging created in renderer, we need to
+  // send/ it to browser, so browser could send message back to Js.
+  SetBrowserToJsMessaging(
+    pending_associated_remote<BrowserToJsMessaging> browser_to_js_messaging);
+};
+
+// For the browser to reply back to injected JavaScript object. Implemented by
+// the renderer.
+interface BrowserToJsMessaging {
+  // Called from browser, to send message to page.
+  OnPostMessage(mojo_base.mojom.String16 message);
+};
+
+// For browser to configure renderer, implemented by renderer.
+interface JsCommunication {
+  // Called from browser, to tell renderer that if we need to inject
+  // JavaScript objects to the frame based on the |js_objects| array.
+  SetJsObjects(array<js_injection.mojom.JsObject> js_objects);
+
+  // Called from browser, to add a script for a frame to run at document start
+  // stage. The script will run only if the frame's origin matches any of the
+  // allowed_origin_rules.
+  AddDocumentStartScript(js_injection.mojom.DocumentStartJavaScript script);
+
+  // Called from browser, to remove the script by the given script_id.
+  RemoveDocumentStartScript(int32 script_id);
+};