Suppress the exception thrown when responding to message with no response callback.

chrome/browser/extensions/hotword_browsertest.cc

+// 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 "base/files/file_path.h"
+#include "base/path_service.h"
+#include "base/prefs/pref_service.h"
+#include "chrome/browser/extensions/error_console/error_console.h"
+#include "chrome/browser/extensions/extension_browsertest.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/common/pref_names.h"
+#include "chrome/test/base/ui_test_utils.h"
+#include "extensions/common/extension.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+
+namespace extensions {
+
+class HotwordBrowserTest : public ExtensionBrowserTest {
+ public:
+  HotwordBrowserTest() : error_console_(NULL) { }
+  virtual ~HotwordBrowserTest() { }
+
+ protected:
+  // Base directory for component extensions.
+  base::FilePath component_extension_dir_;

[Dan Beam, 2014/09/24 01:37:35]

nit: make this member private and expose via

  const base::FilePath& component_extension_dir() const {
    return component_extension_dir_;
  }

if you can

[Anand Mistry (off Chromium), 2014/09/24 03:44:11]

Done.

+
+  virtual void SetUpInProcessBrowserTestFixture() OVERRIDE {
+    ExtensionBrowserTest::SetUpInProcessBrowserTestFixture();
+
+    // We need to enable the ErrorConsole FeatureSwitch in order to collect
+    // errors. This should be enabled on any channel <= Dev, but let's make
+    // sure (in case a test is running on, e.g., a beta channel).
+    FeatureSwitch::error_console()->SetOverrideValue(
+        FeatureSwitch::OVERRIDE_ENABLED);
+  }
+
+  virtual void SetUpOnMainThread() OVERRIDE {
+    ExtensionBrowserTest::SetUpOnMainThread();
+
+    // Errors are only kept if we have Developer Mode enabled.
+    profile()->GetPrefs()->SetBoolean(prefs::kExtensionsUIDeveloperMode, true);
+
+    error_console_ = ErrorConsole::Get(profile());
+    CHECK(error_console_);

[Dan Beam, 2014/09/24 01:37:35]

nit: CHECK() -> ASSERT_TRUE() if you can

[Anand Mistry (off Chromium), 2014/09/24 03:44:11]

Done.

+
+    CHECK(PathService::Get(base::DIR_SOURCE_ROOT, &component_extension_dir_));
+    component_extension_dir_ = component_extension_dir_
+        .AppendASCII("chrome")
+        .AppendASCII("browser")
+        .AppendASCII("resources");
+  }
+
+  void RunMessageLoopForMs(int ms) {
+    base::MessageLoop::current()->PostDelayedTask(
+        FROM_HERE, base::MessageLoop::QuitWhenIdleClosure(),
+        base::TimeDelta::FromMilliseconds(ms));
+    content::RunMessageLoop();
+  }
+
+  ErrorConsole* error_console() { return error_console_; }
+
+ private:
+  // Weak reference to the ErrorConsole.
+  ErrorConsole* error_console_;
+};
+
+// Test we silently capture an exception from a message handler's response
+// callback. This happens when the caller to chrome.runtime.sendMessage()
+// doesn't specify a response callback.
+IN_PROC_BROWSER_TEST_F(HotwordBrowserTest, MessageSendResponseError) {
+  // Enable error reporting for the hotword helper extension.
+  error_console()->SetReportingAllForExtension(
+      "dnhpdliibojhegemfjheidglijccjfmc",
+      true);
+
+  const Extension* extension = LoadExtensionAsComponent(
+      component_extension_dir_.AppendASCII("hotword_helper"));
+  ASSERT_TRUE(extension);
+  const Extension* test_extension = LoadExtension(
+      test_data_dir_.AppendASCII("hotword"));
+  ASSERT_TRUE(test_extension);
+
+  // We're testing that an error doesn't happen. Since there's no event we can
+  // wait for, just sleep for a bit and check.
+  RunMessageLoopForMs(200);
+
+  ASSERT_TRUE(error_console()->GetErrorsForExtension(extension->id()).empty());
+}
+
+}  // namespace extensions