Synchronize access to Locked methods. DO NOT MERGE

onConfigurationChange was calling maybeCreateKeyguardLocked
without actually holding the lock.  Now the call to
maybeCreateKeyguardLocked is synchronized.

May fix bug 7094175.

Change-Id: I3171a18e25f54506f614f9c2cc09aa20080bd6bb

policy/src/com/android/internal/policy/impl/keyguard/KeyguardViewManager.java

@@ -129,12 +129,19 @@ public class KeyguardViewManager {
         @Override
         protected void onConfigurationChanged(Configuration newConfig) {
             super.onConfigurationChanged(newConfig);
-            if (mKeyguardHost.getVisibility() == View.VISIBLE) {
-                // only propagate configuration messages if we're currently showing
-                maybeCreateKeyguardLocked(shouldEnableScreenRotation(), true, null);
-            } else {
-                if (DEBUG) Log.v(TAG, "onConfigurationChanged: view not visible");
-            }
+            post(new Runnable() {
+                @Override
+                public void run() {
+                    synchronized (KeyguardViewManager.this) {
+                        if (mKeyguardHost.getVisibility() == View.VISIBLE) {
+                            // only propagate configuration messages if we're currently showing
+                            maybeCreateKeyguardLocked(shouldEnableScreenRotation(), true, null);
+                        } else {
+                            if (DEBUG) Log.v(TAG, "onConfigurationChanged: view not visible");
+                        }
+                    }
+                }
+            });
         }
 
         @Override