Add flag --require-audio-hardware-for-testing.

media/audio/audio_unittest_utils.cc

+#include "base/command_line.h"

[DaleCurtis, 2015/02/09 22:10:49]

Needs license header.

[watk, 2015/02/10 01:38:33]

Done.

+#include "base/logging.h"
+#include "media/base/media_switches.h"
+
+// For macro ABORT_AUDIO_TEST_IF_NOT.
+bool should_abort_audio_test(bool requirements_satisfied,
+                             const char* requirements_expression,
+                             bool* should_fail) {
+  bool fail_if_unsatisfied = base::CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kRequireAudioHardwareForTesting);
+  if (!requirements_satisfied) {
+    LOG(WARNING) << "Requirement(s) not satisfied (" << requirements_expression
+                 << ")";
+    *should_fail = fail_if_unsatisfied;

[DaleCurtis, 2015/02/09 22:10:49]

Should always be set?

[watk, 2015/02/10 01:38:33]

May as well

+    return true;
+  }
+  return false;
+}