Properly throw java exceptions from shouldOverrideUrlLoading

base/android/java_handler_thread.cc

Index: base/android/java_handler_thread.cc
diff --git a/base/android/java_handler_thread.cc b/base/android/java_handler_thread.cc
index 16c815893693da7d083bb64197e1fb55028ecd5b..76ee301dbb6306a0e51ae71e9bd269d26a094438 100644
--- a/base/android/java_handler_thread.cc
+++ b/base/android/java_handler_thread.cc
@@ -61,17 +61,25 @@ void JavaHandlerThread::InitializeThread(JNIEnv* env,
                                          jlong event) {
   // TYPE_JAVA to get the Android java style message loop.
   message_loop_.reset(new base::MessageLoop(base::MessageLoop::TYPE_JAVA));
-  static_cast<MessageLoopForUI*>(message_loop_.get())->Start();
+  StartMessageLoop();
   reinterpret_cast<base::WaitableEvent*>(event)->Signal();
 }
 
 void JavaHandlerThread::StopThread(JNIEnv* env,
                                    const JavaParamRef<jobject>& obj,
                                    jlong event) {
-  static_cast<MessageLoopForUI*>(message_loop_.get())->QuitWhenIdle();
+  StopMessageLoop();
   reinterpret_cast<base::WaitableEvent*>(event)->Signal();
 }
 
+void JavaHandlerThread::StartMessageLoop() {
+  static_cast<MessageLoopForUI*>(message_loop_.get())->Start();
+}
+
+void JavaHandlerThread::StopMessageLoop() {
+  static_cast<MessageLoopForUI*>(message_loop_.get())->QuitWhenIdle();
+}
+
 // static
 bool JavaHandlerThread::RegisterBindings(JNIEnv* env) {
   return RegisterNativesImpl(env);