Pass media session id over IPC

third_party/WebKit/public/platform/modules/mediasession/WebMediaSession.h

Index: third_party/WebKit/public/platform/modules/mediasession/WebMediaSession.h
diff --git a/third_party/WebKit/public/platform/modules/mediasession/WebMediaSession.h b/third_party/WebKit/public/platform/modules/mediasession/WebMediaSession.h
index e0f465956a4fedce39d4a1b8c0eb42b4f76d82f2..bb7bf41e95b3a0a5be43d7adceb0d3f2bcdc8f2e 100644
--- a/third_party/WebKit/public/platform/modules/mediasession/WebMediaSession.h
+++ b/third_party/WebKit/public/platform/modules/mediasession/WebMediaSession.h
@@ -10,6 +10,8 @@
 
 namespace blink {
 
+static const int kDefaultMediaSessionID = 0;

[DaleCurtis, 2016/02/26 19:14:30]

No static const in header files since each include gets its own copy. Instead
define it in the .cpp file and a prototype here or use an enum.

[DaleCurtis, 2016/02/26 19:16:44]

Discussion here
https://groups.google.com/a/chromium.org/forum/#!topic/chromium-dev/hDqJ4KBVqog

[davve, 2016/02/29 09:04:01]

Thanks for looking! An enum looks like the appropriate choice here.

+
 using WebMediaSessionActivateCallback = WebCallbacks<void, const WebMediaSessionError&>;
 using WebMediaSessionDeactivateCallback = WebCallbacks<void, void>;