skiaserve: Add /quitquitquit handler. Will be used in the hosted debugger.

tools/skiaserve/urlhandlers/QuitHandler.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "UrlHandler.h"
 
 #include "microhttpd.h"
 #include "../Request.h"
 #include "../Response.h"
 
 using namespace Response;
 
-bool RootHandler::canHandle(const char* method, const char* url) {
+bool QuitHandler::canHandle(const char* method, const char* url) {
+    const char* kBaseName = "/quitquitquit";
     return 0 == strcmp(method, MHD_HTTP_METHOD_GET) &&
-           0 == strcmp(url, "/");
+           0 == strncmp(url, kBaseName, strlen(kBaseName));
 }
 
-int RootHandler::handle(Request* request, MHD_Connection* connection,
+int QuitHandler::handle(Request* request, MHD_Connection* connection,
                         const char* url, const char* method,
                         const char* upload_data, size_t* upload_data_size) {
-    return SendTemplate(connection);
+    exit(0);
 }