Fix issue 3371080

Modified default volume control logic in AudioService:
1 IN_CALL volume if in video/audio chat
2 NOTIFICATION if notification is playing or was playing less than 5s ago.
3 MUSIC

Modified silent mode:
- now also affect MUSIC stream type
- entering silent mode when VOL- hard key is pressed once while selected
stream volume is already at 0 (except for VOICE_CALL stream).
- exiting silent mode when pressing VOL+ hard key while in silent mode

Play sound FX (audible selections, keyboard clicks) at a fixed volume.

Modified audio framework:
- isStreamActive() method now implemented in AudioPolicyManagerBase (previously AudioFlinger)
- iStreamActive() now specifies a time window during which the stream is considered
active after it actually stopped.

Change-Id: I7e5a0724099450b9fc90825224180ac97322785f

media/java/android/media/AudioSystem.java

@@ -158,7 +158,7 @@ public class AudioSystem
      *
      * return true if any track playing on this stream is active.
      */
-    public static native boolean isStreamActive(int stream);
+    public static native boolean isStreamActive(int stream, int inPastMs);
 
     /*
      * Sets a group generic audio configuration parameters. The use of these parameters