Make autoplay policies no longer platform dependant.

media/base/media_util.h

Index: media/base/media_util.h
diff --git a/media/base/media_util.h b/media/base/media_util.h
index 0c459018cf2d14f32b74615f4b582c99ccdebc7f..66a3232d8f4565aaa7d67e742d504ae8fab4c519 100644
--- a/media/base/media_util.h
+++ b/media/base/media_util.h
@@ -6,11 +6,16 @@
 #define MEDIA_BASE_MEDIA_UTIL_H_
 
 #include <stdint.h>
+#include <string>
 #include <vector>
 
 #include "media/base/encryption_scheme.h"
 #include "media/base/media_export.h"
 
+namespace base {
+class CommandLine;
+}
+
 namespace media {
 
 // Simply returns an empty vector. {Audio|Video}DecoderConfig are often
@@ -22,6 +27,14 @@ MEDIA_EXPORT std::vector<uint8_t> EmptyExtraData();
 MEDIA_EXPORT EncryptionScheme Unencrypted();
 MEDIA_EXPORT EncryptionScheme AesCtrEncryptionScheme();
 
+// Based on a |command_line| and the current platform, returns the effective

[DaleCurtis, 2017/04/27 18:59:39]

Hmm, I didn't even know we had a media_util file, this should probably be
deleted and these moved elsewhere. Can we keep this method in media_witches?

[mlamouri (slow - plz ping), 2017/04/27 21:34:14]

I was considering having this in media_switches but happy to invoke some witches
:)

+// autoplay policy. In other words, it will take into account the default policy
+// if none is specified via the command line and options passed for testing.
+// Returns one of the possible autoplay policy switches from the
+// switches::autoplay namespace.
+MEDIA_EXPORT std::string GetEffectiveAutoplayPolicy(
+    const base::CommandLine& command_line);
+
 }  // namespace media
 
 #endif  // MEDIA_BASE_MEDIA_UTIL_H_