Fix problems dispatching media button events on headless devices

Signed-off-by: Mike Lockwood <lockwood@android.com>

Conflicts:

	policy/src/com/android/internal/policy/impl/PhoneWindowManager.java

services/java/com/android/server/wm/WindowManagerService.java

@@ -4893,7 +4893,7 @@ public class WindowManagerService extends IWindowManager.Stub
 
     public void performBootTimeout() {
         synchronized(mWindowMap) {
-            if (mDisplayEnabled) {
+            if (mDisplayEnabled || mHeadless) {
                 return;
             }
             Slog.w(TAG, "***** BOOT TIMEOUT: forcing display enabled");