[extension SW]: Support event listener registration and event dispatching.

extensions/renderer/extension_frame_helper.cc

 // Copyright 2013 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.
 
 #include "extensions/renderer/extension_frame_helper.h"
 
 #include "base/metrics/histogram_macros.h"
 #include "base/strings/string_util.h"
 #include "base/timer/elapsed_timer.h"
+#include "content/public/child/worker_thread.h"
 #include "content/public/renderer/render_frame.h"
 #include "extensions/common/api/messaging/message.h"
 #include "extensions/common/api/messaging/port_id.h"
 #include "extensions/common/constants.h"
 #include "extensions/common/extension_messages.h"
 #include "extensions/common/manifest_handlers/background_info.h"
 #include "extensions/renderer/console.h"
 #include "extensions/renderer/content_watcher.h"
 #include "extensions/renderer/dispatcher.h"
 #include "extensions/renderer/messaging_bindings.h"
@@ skipping 121 matching lines @@
 
 // static
 bool ExtensionFrameHelper::IsContextForEventPage(const ScriptContext* context) {
   content::RenderFrame* render_frame = context->GetRenderFrame();
   return context->extension() && render_frame &&
          BackgroundInfo::HasLazyBackgroundPage(context->extension()) &&
          ExtensionFrameHelper::Get(render_frame)->view_type() ==
               VIEW_TYPE_EXTENSION_BACKGROUND_PAGE;
 }
 
+bool ExtensionFrameHelper::IsContextForSW(const ScriptContext& context) {

[Devlin, 2017/05/24 17:58:25]

We already have context_type() on ScriptContext; do we need this?  If so, we
should move it to ScriptContext, since it's very weird to query the frame
helper, when, by definition, service workers don't run in a frame.

[lazyboy, 2017/05/25 01:33:43]

context_type() should be fine, thanks.
Done.

+  if (content::WorkerThread::GetCurrentId() != 0) {
+    DCHECK(context.GetRenderFrame() == nullptr);
+    return true;
+  }
+  return false;
+}
+
 void ExtensionFrameHelper::DidCreateDocumentElement() {
   did_create_current_document_element_ = true;
   extension_dispatcher_->DidCreateDocumentElement(
       render_frame()->GetWebFrame());
 }
 
 void ExtensionFrameHelper::DidCreateNewDocument() {
   did_create_current_document_element_ = false;
 }
 
@@ skipping 168 matching lines @@
     const base::ListValue& args) {
   extension_dispatcher_->InvokeModuleSystemMethod(
       render_frame(), extension_id, module_name, function_name, args);
 }
 
 void ExtensionFrameHelper::OnDestruct() {
   delete this;
 }
 
 }  // namespace extensions