Flip unified media pipeline to default-on w/ disabled holdback.

media/base/run_all_unittests.cc

Index: media/base/run_all_unittests.cc
diff --git a/media/base/run_all_unittests.cc b/media/base/run_all_unittests.cc
index cf00555a4541073cd59d37f4c4ce2311f112080b..c84e24d7c06fe7e1f284019a17302f4f1b538dc4 100644
--- a/media/base/run_all_unittests.cc
+++ b/media/base/run_all_unittests.cc
@@ -14,6 +14,7 @@
 
 #if defined(OS_ANDROID)
 #include "base/android/jni_android.h"
+#include "media/base/android/media_codec_util.h"
 #include "media/base/android/media_jni_registrar.h"
 #include "media/capture/video/android/capture_jni_registrar.h"
 #include "ui/gl/android/gl_jni_registrar.h"
@@ -45,6 +46,9 @@ void TestSuiteNoAtExit::Initialize() {
   ui::gl::android::RegisterJni(env);
   media::RegisterJni(env);
   media::RegisterCaptureJni(env);
+
+  if (media::MediaCodecUtil::IsMediaCodecAvailable())
+    media::EnablePlatformDecoderSupport();
 #endif
 
   // Run this here instead of main() to ensure an AtExitManager is already