Add stencil buffer to the EGL config

Change-Id: If76c0cd6127534d90f9526b75c0f8e56259c6722
diff --git a/core/jni/android_view_GLES20Canvas.cpp b/core/jni/android_view_GLES20Canvas.cpp
index 6a533c0..32f8780 100644
--- a/core/jni/android_view_GLES20Canvas.cpp
+++ b/core/jni/android_view_GLES20Canvas.cpp
@@ -188,6 +188,14 @@
     renderer->finish();
 }
 
+static jint android_view_GLES20Canvas_getStencilSize(JNIEnv* env, jobject clazz) {
+    return OpenGLRenderer::getStencilSize();
+}
+
+// ----------------------------------------------------------------------------
+// Functor
+// ----------------------------------------------------------------------------
+
 static bool android_view_GLES20Canvas_callDrawGLFunction(JNIEnv* env, jobject clazz,
         OpenGLRenderer* renderer, Functor *functor) {
     android::uirenderer::Rect dirty;
@@ -808,6 +816,8 @@
     { "nPrepareDirty",      "(IIIIIZ)V",       (void*) android_view_GLES20Canvas_prepareDirty },
     { "nFinish",            "(I)V",            (void*) android_view_GLES20Canvas_finish },
 
+    { "nGetStencilSize",    "()I",             (void*) android_view_GLES20Canvas_getStencilSize },
+
     { "nCallDrawGLFunction", "(II)Z",
             (void*) android_view_GLES20Canvas_callDrawGLFunction },