am: Increase dropbox buffer size to 256KB (from 128KB)

Minor changes for dumping stack traces:
- Print the native traces right after foreground/persistent apps
- Also include mediaserver, sdcard, and surfaceflinger in traces

Bug: 11321322
Change-Id: Ic09b7da316a5f197dda0ac3bde06f75574cc2166
diff --git a/services/java/com/android/server/Watchdog.java b/services/java/com/android/server/Watchdog.java
index 616090e..dfffd2e 100644
--- a/services/java/com/android/server/Watchdog.java
+++ b/services/java/com/android/server/Watchdog.java
@@ -60,7 +60,8 @@
 
     static final int TIME_TO_WAIT = DB ? 5*1000 : 30*1000;
 
-    static final String[] NATIVE_STACKS_OF_INTEREST = new String[] {
+    // Which native processes to dump into dropbox's stack traces
+    public static final String[] NATIVE_STACKS_OF_INTEREST = new String[] {
         "/system/bin/mediaserver",
         "/system/bin/sdcard",
         "/system/bin/surfaceflinger"