Add support for secure system overlays.

Manual merge from Gingerbread.

This change adds a new window type for secure system overlays
created by the system itself from non-secure system overlays that
might be created by applications that have the system alert permission.
Secure views ignore the presence of secure system overlays.

Bug: 3098519
Change-Id: Id876736fd8bf332ff9a5428bde59f5268aa49c3a
diff --git a/include/ui/InputDispatcher.h b/include/ui/InputDispatcher.h
index 63185d3..b811ace 100644
--- a/include/ui/InputDispatcher.h
+++ b/include/ui/InputDispatcher.h
@@ -183,6 +183,7 @@
         TYPE_INPUT_METHOD_DIALOG= FIRST_SYSTEM_WINDOW+12,
         TYPE_WALLPAPER          = FIRST_SYSTEM_WINDOW+13,
         TYPE_STATUS_BAR_PANEL   = FIRST_SYSTEM_WINDOW+14,
+        TYPE_SECURE_SYSTEM_OVERLAY = FIRST_SYSTEM_WINDOW+15,
         LAST_SYSTEM_WINDOW      = 2999,
     };
 
diff --git a/libs/ui/InputDispatcher.cpp b/libs/ui/InputDispatcher.cpp
index 84c3db8..949dc4d 100644
--- a/libs/ui/InputDispatcher.cpp
+++ b/libs/ui/InputDispatcher.cpp
@@ -149,7 +149,8 @@
 
 bool InputWindow::isTrustedOverlay() const {
     return layoutParamsType == TYPE_INPUT_METHOD
-            || layoutParamsType == TYPE_INPUT_METHOD_DIALOG;
+            || layoutParamsType == TYPE_INPUT_METHOD_DIALOG
+            || layoutParamsType == TYPE_SECURE_SYSTEM_OVERLAY;
 }
 
 
@@ -1350,7 +1351,7 @@
         target.flags = 0;
         target.xOffset = 0;
         target.yOffset = 0;
-        target.windowType = InputWindow::TYPE_SYSTEM_OVERLAY;
+        target.windowType = -1;
     }
 }