Option to enable StrictMode flashing on userdebug builds.

Change-Id: Ifc8e733ea0e0f6bda234a18ad84bcd230879e802
diff --git a/core/java/android/view/IWindowManager.aidl b/core/java/android/view/IWindowManager.aidl
index d964e2f..beda099 100644
--- a/core/java/android/view/IWindowManager.aidl
+++ b/core/java/android/view/IWindowManager.aidl
@@ -140,6 +140,12 @@
     // on screen)
     void showStrictModeViolation(boolean on);
 
+    // Proxy to set the system property for whether the flashing
+    // should be enabled.  The 'enabled' value is null or blank for
+    // the system default (differs per build variant) or any valid
+    // boolean string as parsed by SystemProperties.getBoolean().
+    void setStrictModeVisualIndicatorPreference(String enabled);
+
     // These can only be called with the SET_ORIENTATION permission.
     /**
      * Change the current screen rotation, constants as per