Implement the rest of the PPAPI examples in the GN build.

ppapi/lib/gl/gles2/BUILD.gn

Index: ppapi/lib/gl/gles2/BUILD.gn
diff --git a/ppapi/lib/gl/gles2/BUILD.gn b/ppapi/lib/gl/gles2/BUILD.gn
index 368defa7aef0e3e2be50afb3d0d492acf5a81f6f..81bdde4b389bdf05197031c4411a4d8d1d3a610e 100644
--- a/ppapi/lib/gl/gles2/BUILD.gn
+++ b/ppapi/lib/gl/gles2/BUILD.gn
@@ -1,6 +1,10 @@
 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
+# found in the LICENSE file.
+
+config("gles2_config") {
+  include_dirs = [ "//ppapi/lib/gl/include" ]
+}
 
 source_set("gles2") {
   sources = [
@@ -9,9 +13,9 @@ source_set("gles2") {
     "gles2.c",
   ]
 
-  include_dirs = [ "lib/gl/include" ]
+  public_configs = [ ":gles2_config" ]
 
-  deps = [
+  public_deps = [
     "//ppapi/c",
   ]
 }