Enable chrome.tabs api for chromecast

Part of ongoing effort to enable ChromeVox in
chromecast.  This CL brings in the chrome.tabs
api.

Bug: 73383411
Test: None
Change-Id: I4d6d666f56bcc535e30f617ac786b1f1da05a517
Reviewed-on: https://chromium-review.googlesource.com/1100970
Commit-Queue: Randy Rossi <rmrossi@chromium.org>
Reviewed-by: Alex Sakhartchouk <alexst@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567319}

chromecast/renderer/cast_extensions_dispatcher_delegate.cc

@@ -72,6 +72,7 @@ void CastExtensionsDispatcherDelegate::PopulateSourceMap(
   source_map->RegisterSource("automation", IDR_AUTOMATION_CUSTOM_BINDINGS_JS);
   source_map->RegisterSource("automationEvent", IDR_AUTOMATION_EVENT_JS);
   source_map->RegisterSource("automationNode", IDR_AUTOMATION_NODE_JS);
+  source_map->RegisterSource("tabs", IDR_TABS_CUSTOM_BINDINGS_JS);
 }
 
 void CastExtensionsDispatcherDelegate::RequireAdditionalModules(

chromecast/renderer/resources/extensions/tabs_custom_bindings.js

+// Copyright (c) 2018 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.
+
+// Custom binding for the tabs API.
+var binding = apiBridge || require('binding').Binding.create('tabs');
+
+var messaging = require('messaging');
+var OpenChannelToTab = requireNative('messaging_natives').OpenChannelToTab;
+var sendRequestIsDisabled = requireNative('process').IsSendRequestDisabled();
+var forEach = require('utils').forEach;
+
+binding.registerCustomHook(function(bindingsAPI, extensionId) {
+  var apiFunctions = bindingsAPI.apiFunctions;
+  var tabs = bindingsAPI.compiledApi;
+
+  apiFunctions.setHandleRequest('connect', function(tabId, connectInfo) {
+    var name = '';
+    var frameId = -1;
+    if (connectInfo) {
+      name = connectInfo.name || name;
+      frameId = connectInfo.frameId;
+      if (typeof frameId == 'undefined' || frameId === null || frameId < 0)
+        frameId = -1;
+    }
+    var portId = OpenChannelToTab(tabId, frameId, extensionId, name);
+    return messaging.createPort(portId, name);
+  });
+
+  apiFunctions.setHandleRequest('sendRequest',
+                                function(tabId, request, responseCallback) {
+    if (sendRequestIsDisabled)
+      throw new Error(sendRequestIsDisabled);
+    var port = tabs.connect(tabId, {name: messaging.kRequestChannel});
+    messaging.sendMessageImpl(port, request, responseCallback);
+  });
+
+  apiFunctions.setHandleRequest('sendMessage',
+      function(tabId, message, options, responseCallback) {
+    var connectInfo = {
+      name: messaging.kMessageChannel
+    };
+    if (options) {
+      forEach(options, function(k, v) {
+        connectInfo[k] = v;
+      });
+    }
+
+    var port = tabs.connect(tabId, connectInfo);
+    messaging.sendMessageImpl(port, message, responseCallback);
+  });
+});
+
+if (!apiBridge)
+  exports.$set('binding', binding.generate());

chromecast/renderer/resources/extensions_renderer_resources.grd

@@ -12,6 +12,7 @@
       <include name="IDR_AUTOMATION_CUSTOM_BINDINGS_JS" file="extensions\automation_custom_bindings.js" type="BINDATA" />
       <include name="IDR_AUTOMATION_EVENT_JS" file="extensions\automation\automation_event.js" type="BINDATA" />
       <include name="IDR_AUTOMATION_NODE_JS" file="extensions\automation\automation_node.js" type="BINDATA" />
+      <include name="IDR_TABS_CUSTOM_BINDINGS_JS" file="extensions\tabs_custom_bindings.js" type="BINDATA" />
       <include name="IDR_TTS_CUSTOM_BINDINGS_JS" file="extensions\tts_custom_bindings.js" type="BINDATA" />
       <include name="IDR_TTS_ENGINE_CUSTOM_BINDINGS_JS" file="extensions\tts_engine_custom_bindings.js" type="BINDATA" />
     </includes>