Fix clang -Wc++11-narrowing warnings.

Clang compiler gives warning to implicit conversions of
literal structure fields, although the compiler generated
implicit conversions are what we want in these cases.

Change-Id: I8f04e7f2fa1db0ed1d1937135d9091532eec3d5b
diff --git a/opengl/tests/angeles/app-linux.cpp b/opengl/tests/angeles/app-linux.cpp
index e490351..ced8786 100644
--- a/opengl/tests/angeles/app-linux.cpp
+++ b/opengl/tests/angeles/app-linux.cpp
@@ -118,7 +118,7 @@
         fprintf(stderr, "EGL Error: 0x%04x\n", (int)error);
 }
 
-static int initGraphics(unsigned samples, const WindowSurface& windowSurface)
+static int initGraphics(EGLint samples, const WindowSurface& windowSurface)
 {
     EGLint configAttribs[] = {
             EGL_DEPTH_SIZE, 16,