Android GTest Runner: Create flags & test list files only when required

testing/android/native_test/native_test_launcher.cc

 // Copyright (c) 2012 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.
 
 // This class sets up the environment for running the native tests inside an
 // android application. It outputs (to a fifo) markers identifying the
 // START/PASSED/CRASH of the test suite, FAILURE/SUCCESS of individual tests,
 // etc.
 // These markers are read by the test runner script to generate test results.
 // It installs signal handlers to detect crashes.
@@ skipping 18 matching lines @@
 #include "testing/android/native_test/native_test_util.h"
 
 // The main function of the program to be wrapped as a test apk.
 extern int main(int argc, char** argv);
 
 namespace testing {
 namespace android {
 
 namespace {
 
-// The test runner script writes the command line file in
-// "/data/local/tmp".
-static const char kCommandLineFilePath[] =
-    "/data/local/tmp/chrome-native-tests-command-line";
-
 const char kLogTag[] = "chromium";
 const char kCrashedMarker[] = "[ CRASHED      ]\n";
 
 // The list of signals which are considered to be crashes.
 const int kExceptionSignals[] = {
   SIGSEGV, SIGABRT, SIGFPE, SIGILL, SIGBUS, -1
 };
 
 struct sigaction g_old_sa[NSIG];
 
@@ skipping 28 matching lines @@
 
   // Set the application context in base.
   base::android::InitApplicationContext(env, app_context);
   base::android::RegisterJni(env);
 
   std::vector<std::string> args;
 
   const std::string command_line_file_path(
       base::android::ConvertJavaStringToUTF8(env, jcommand_line_file_path));
   if (command_line_file_path.empty())
-    ParseArgsFromCommandLineFile(kCommandLineFilePath, &args);
+    args.push_back("_");
   else
     ParseArgsFromCommandLineFile(command_line_file_path.c_str(), &args);
 
   const std::string command_line_flags(
       base::android::ConvertJavaStringToUTF8(env, jcommand_line_flags));
   ParseArgsFromString(command_line_flags, &args);
 
   std::vector<char*> argv;
   int argc = ArgsToArgv(args, &argv);
 
@@ skipping 47 matching lines @@
   sa.sa_sigaction = SignalHandler;
   sa.sa_flags = SA_SIGINFO;
 
   for (unsigned int i = 0; kExceptionSignals[i] != -1; ++i) {
     sigaction(kExceptionSignals[i], &sa, &g_old_sa[kExceptionSignals[i]]);
   }
 }
 
 }  // namespace android
 }  // namespace testing