Add --hot-reload-test-mode flag to embedder and wire it up to test.py

runtime/bin/main.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include <stdlib.h>
 #include <string.h>
 #include <stdio.h>
 
 #include "include/dart_api.h"
 #include "include/dart_tools_api.h"
@@ skipping 407 matching lines @@
 static bool ProcessTraceLoadingOption(const char* arg,
                                       CommandLineOptions* vm_options) {
   if (*arg != '\0') {
     return false;
   }
   trace_loading = true;
   return true;
 }
 
 
+static bool ProcessHotReloadTestModeOption(const char* arg,
+                                           CommandLineOptions* vm_options) {
+  if (*arg != '\0') {
+    return false;
+  }
+
+  // Identity reload.
+  vm_options->AddArgument("--identity_reload");
+  // Start reloading quickly.
+  vm_options->AddArgument("--reload_every=50");
+  // Reload from optimized and unoptimized code.
+  vm_options->AddArgument("--reload_every_optimized=false");
+  // Reload less frequently as time goes on.
+  vm_options->AddArgument("--reload_every_back_off");
+  // Ensure that an isolate has reloaded once.
+  vm_options->AddArgument("--check_reloaded");
+
+  return true;
+}
+
 
 static bool ProcessShutdownOption(const char* arg,
                                   CommandLineOptions* vm_options) {
   ASSERT(arg != NULL);
   if (*arg == '\0') {
     do_vm_shutdown = true;
     vm_options->AddArgument("--shutdown");
     return true;
   }
 
@@ skipping 32 matching lines @@
   // VM specific options to the standalone dart program.
   { "--compile_all", ProcessCompileAllOption },
   { "--enable-vm-service", ProcessEnableVmServiceOption },
   { "--observe", ProcessObserveOption },
   { "--shutdown", ProcessShutdownOption },
   { "--snapshot=", ProcessSnapshotFilenameOption },
   { "--snapshot-kind=", ProcessSnapshotKindOption },
   { "--run-app-snapshot=", ProcessRunAppSnapshotOption },
   { "--use-blobs", ProcessUseBlobsOption },
   { "--trace-loading", ProcessTraceLoadingOption },
+  { "--hot-reload-test-mode", ProcessHotReloadTestModeOption },
   { NULL, NULL }
 };
 
 
 static bool ProcessMainOptions(const char* option,
                                CommandLineOptions* vm_options) {
   int i = 0;
   const char* name = main_options[0].option_name;
   int option_length = strlen(option);
   while (name != NULL) {
@@ skipping 1258 matching lines @@
   Platform::Exit(Process::GlobalExitCode());
 }
 
 }  // namespace bin
 }  // namespace dart
 
 int main(int argc, char** argv) {
   dart::bin::main(argc, argv);
   UNREACHABLE();
 }