Shows the error message while fetching the SW script in the DevTools console.

content/renderer/service_worker/embedded_worker_dispatcher.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 "content/renderer/service_worker/embedded_worker_dispatcher.h"
 
 #include <memory>
 
 #include "base/metrics/histogram_macros.h"
 #include "base/strings/string16.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/child/child_process.h"
 #include "content/child/scoped_child_process_reference.h"
 #include "content/child/thread_safe_sender.h"
 #include "content/child/worker_thread_registry.h"
 #include "content/common/devtools_messages.h"
 #include "content/common/service_worker/embedded_worker_messages.h"
 #include "content/public/common/content_client.h"
 #include "content/renderer/render_thread_impl.h"
 #include "content/renderer/service_worker/embedded_worker_devtools_agent.h"
 #include "content/renderer/service_worker/service_worker_context_client.h"
 #include "third_party/WebKit/public/platform/WebString.h"
 #include "third_party/WebKit/public/platform/WebURL.h"
+#include "third_party/WebKit/public/web/WebConsoleMessage.h"
 #include "third_party/WebKit/public/web/WebEmbeddedWorker.h"
 #include "third_party/WebKit/public/web/WebEmbeddedWorkerStartData.h"
 
 namespace content {
 
 // A thin wrapper of WebEmbeddedWorker which also adds and releases process
 // references automatically.
 class EmbeddedWorkerDispatcher::WorkerWrapper {
  public:
   WorkerWrapper(blink::WebEmbeddedWorker* worker, int devtools_agent_route_id)
@@ skipping 15 matching lines @@
 EmbeddedWorkerDispatcher::~EmbeddedWorkerDispatcher() {}
 
 bool EmbeddedWorkerDispatcher::OnMessageReceived(
     const IPC::Message& message) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(EmbeddedWorkerDispatcher, message)
     IPC_MESSAGE_HANDLER(EmbeddedWorkerMsg_StartWorker, OnStartWorker)
     IPC_MESSAGE_HANDLER(EmbeddedWorkerMsg_StopWorker, OnStopWorker)
     IPC_MESSAGE_HANDLER(EmbeddedWorkerMsg_ResumeAfterDownload,
                         OnResumeAfterDownload)
+    IPC_MESSAGE_HANDLER(EmbeddedWorkerMsg_AddMessageToConsole,
+                        OnAddMessageToConsole)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
 }
 
 void EmbeddedWorkerDispatcher::WorkerContextDestroyed(
     int embedded_worker_id) {
   if (ContainsKey(stop_worker_times_, embedded_worker_id)) {
     base::TimeTicks stop_time = stop_worker_times_[embedded_worker_id];
     UMA_HISTOGRAM_MEDIUM_TIMES("ServiceWorker.TerminateThread.Time",
@@ skipping 57 matching lines @@
   TRACE_EVENT0("ServiceWorker",
                "EmbeddedWorkerDispatcher::OnResumeAfterDownload");
   WorkerWrapper* wrapper = workers_.Lookup(embedded_worker_id);
   if (!wrapper) {
     LOG(WARNING) << "Got OnResumeAfterDownload for nonexistent worker";
     return;
   }
   wrapper->worker()->resumeAfterDownload();
 }
 
+void EmbeddedWorkerDispatcher::OnAddMessageToConsole(
+    int embedded_worker_id,
+    ConsoleMessageLevel level,
+    const std::string& message) {
+  WorkerWrapper* wrapper = workers_.Lookup(embedded_worker_id);
+  if (!wrapper)
+    return;
+  blink::WebConsoleMessage::Level target_level =
+      blink::WebConsoleMessage::LevelLog;
+  switch (level) {
+    case CONSOLE_MESSAGE_LEVEL_DEBUG:
+      target_level = blink::WebConsoleMessage::LevelDebug;
+      break;
+    case CONSOLE_MESSAGE_LEVEL_LOG:
+      target_level = blink::WebConsoleMessage::LevelLog;
+      break;
+    case CONSOLE_MESSAGE_LEVEL_WARNING:
+      target_level = blink::WebConsoleMessage::LevelWarning;
+      break;
+    case CONSOLE_MESSAGE_LEVEL_ERROR:
+      target_level = blink::WebConsoleMessage::LevelError;
+      break;
+  }
+  wrapper->worker()->addMessageToConsole(blink::WebConsoleMessage(
+      target_level, blink::WebString::fromUTF8(message)));
+}
+
 }  // namespace content