mojo: Convert gles2 to the new thunking system

mojo/mojo_public.gypi

Index: mojo/mojo_public.gypi
diff --git a/mojo/mojo_public.gypi b/mojo/mojo_public.gypi
index a728bdc75a4a225534fa4ab4929369767b97bbd3..5ec7020778a08b3cdae87e7013cd971b056d81e3 100644
--- a/mojo/mojo_public.gypi
+++ b/mojo/mojo_public.gypi
@@ -44,6 +44,46 @@
       ],
     },
     {
+      # GN version: //mojo/public/gles2
+      'target_name': 'mojo_gles2',
+      'type': 'static_library',
+      'defines': [
+        'MOJO_GLES2_IMPLEMENTATION',
+        'GLES2_USE_MOJO',
+      ],
+      'include_dirs': [
+        '..',
+      ],
+      'dependencies': [
+        '../third_party/khronos/khronos.gyp:khronos_headers'
+      ],
+      'direct_dependent_settings': {
+        'include_dirs': [
+          '..',
+        ],
+        'defines': [
+          'GLES2_USE_MOJO',
+        ],
+      },
+      'all_dependent_settings': {
+        'conditions': [
+          # We need to be able to call the MojoSetGLES2Thunks() function in
+          # gles2_thunks.cc
+          ['OS=="android"', {
+            'ldflags!': [
+              '-Wl,--exclude-libs=ALL',
+            ],
+          }],
+        ],
+      },
+      'sources': [
+        'public/c/gles2/gles2.h',
+        'public/c/gles2/gles2_export.h',
+        'public/platform/native/gles2_thunks.cc',
+        'public/platform/native/gles2_thunks.h',
+      ],
+    },
+    {
       # GN version: //mojo/public/cpp/bindings
       'target_name': 'mojo_cpp_bindings',
       'type': 'static_library',