Properly throw java exceptions from shouldOverrideUrlLoading

base/test/android/java_handler_thread_for_testing.cc

+// Copyright 2016 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/test/android/java_handler_thread_for_testing.h"
+
+#include "base/message_loop/message_loop.h"
+
+namespace base {
+namespace android {
+
+base::android::ScopedJavaLocalRef<jobject>
+TestJavaMessageHandlerFactory::CreateMessageHandler(
+    JNIEnv* env,
+    base::MessagePump::Delegate* delegate,
+    MessagePumpForUI* message_pump,
+    WaitableEvent* test_done_event) {
+  return TestSystemMessageHandlerLink::CreateTestSystemMessageHandler(
+      env, delegate, message_pump, test_done_event);
+}
+
+JavaHandlerThreadForTesting::JavaHandlerThreadForTesting(
+    const char* name,
+    base::WaitableEvent* test_done_event)
+    : JavaHandlerThread(name),
+      message_handler_factory_(new TestJavaMessageHandlerFactory()),
+      test_done_event_(test_done_event) {}
+
+JavaHandlerThreadForTesting::~JavaHandlerThreadForTesting() = default;
+
+void JavaHandlerThreadForTesting::StartMessageLoop() {
+  static_cast<MessageLoopForUI*>(message_loop_.get())
+      ->StartForTesting(
+          message_handler_factory_.get(),
+          reinterpret_cast<base::WaitableEvent*>(test_done_event_));
+}
+
+void JavaHandlerThreadForTesting::StopMessageLoop() {
+  // Instead of calling MessageLoop::QuitWhenIdle here we call
+  // MessageLoop::QuitNow. This is because QuitWhenIdle will have no effect on
+  // the message loop after MessageLoop::Abort has been called (which should
+  // have happened at this point).
+  static_cast<MessageLoopForUI*>(message_loop_.get())->QuitNow();
+  // The message loop must be destroyed on the thread it is attached to.
+  message_loop_.reset();
+}
+
+}  // namespace base
+}  // namespace android