Extract ResultCatcher from ExtensionApiTest. Use it in ShellApiTest.

extensions/test/result_catcher.cc

Index: extensions/test/result_catcher.cc
diff --git a/extensions/test/result_catcher.cc b/extensions/test/result_catcher.cc
new file mode 100644
index 0000000000000000000000000000000000000000..c6f5d525f8d3a0bf12603b4ab2fc8a9f0f2d5178
--- /dev/null
+++ b/extensions/test/result_catcher.cc
@@ -0,0 +1,79 @@
+// Copyright 2014 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/test/result_catcher.h"
+
+#include "content/public/browser/notification_service.h"
+#include "content/public/test/test_utils.h"
+#include "extensions/browser/notification_types.h"
+
+namespace extensions {
+
+ResultCatcher::ResultCatcher() : context_restriction_(NULL), waiting_(false) {
+  registrar_.Add(this,
+                 extensions::NOTIFICATION_EXTENSION_TEST_PASSED,
+                 content::NotificationService::AllSources());
+  registrar_.Add(this,
+                 extensions::NOTIFICATION_EXTENSION_TEST_FAILED,
+                 content::NotificationService::AllSources());
+}
+
+ResultCatcher::~ResultCatcher() {
+}
+
+bool ResultCatcher::GetNextResult() {
+  // Depending on the tests, multiple results can come in from a single call
+  // to RunMessageLoop(), so we maintain a queue of results and just pull them
+  // off as the test calls this, going to the run loop only when the queue is
+  // empty.
+  if (results_.empty()) {
+    waiting_ = true;
+    content::RunMessageLoop();
+    waiting_ = false;
+  }
+
+  if (!results_.empty()) {
+    bool ret = results_.front();
+    results_.pop_front();
+    message_ = messages_.front();
+    messages_.pop_front();
+    return ret;
+  }
+
+  NOTREACHED();
+  return false;
+}
+
+void ResultCatcher::Observe(int type,
+                            const content::NotificationSource& source,
+                            const content::NotificationDetails& details) {
+  if (context_restriction_ &&
+      content::Source<content::BrowserContext>(source).ptr() !=
+          context_restriction_) {
+    return;
+  }
+
+  switch (type) {
+    case extensions::NOTIFICATION_EXTENSION_TEST_PASSED:
+      VLOG(1) << "Got EXTENSION_TEST_PASSED notification.";
+      results_.push_back(true);
+      messages_.push_back(std::string());
+      if (waiting_)
+        base::MessageLoopForUI::current()->Quit();
+      break;
+
+    case extensions::NOTIFICATION_EXTENSION_TEST_FAILED:
+      VLOG(1) << "Got EXTENSION_TEST_FAILED notification.";
+      results_.push_back(false);
+      messages_.push_back(*(content::Details<std::string>(details).ptr()));
+      if (waiting_)
+        base::MessageLoopForUI::current()->Quit();
+      break;
+
+    default:
+      NOTREACHED();
+  }
+}
+
+}  // namespace extensions