support multi-frame following

src/content/components/top-content/index.js

@@ -0,0 +1,32 @@
+import CommonComponent from '../common';
+import FollowController from './follow-controller';
+import * as consoleFrames from '../../console-frames';
+import messages from 'shared/messages';
+
+export default class TopContent {
+
+  constructor(win, store) {
+    this.win = win;
+    this.children = [
+      new CommonComponent(win, store),
+      new FollowController(win, store),
+    ];
+
+    // TODO make component
+    consoleFrames.initialize(window.document);
+  }
+
+  update() {
+    this.children.forEach(c => c.update());
+  }
+
+  onMessage(message, sender) {
+    switch (message.type) {
+    case messages.CONSOLE_HIDE_COMMAND:
+      this.win.focus();
+      consoleFrames.blur(window.document);
+      return Promise.resolve();
+    }
+    this.children.forEach(c => c.onMessage(message, sender));
+  }
+}