ppapi_egl target is currently unused as verified by using:...

ppapi/lib/gl/gl.gyp

+# Copyright (c) 2010 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.
+
+{
+  'includes': [
+    '../../../third_party/mesa/mesa.gypi',
+  ],
+  'variables': {
+    'chromium_code': 1,  # Use higher warning level.
+  },
+  'targets': [
+    {
+      'target_name': 'ppapi_egl',
+      'type': 'static_library',
+      'dependencies': [
+        '<(DEPTH)/ppapi/ppapi.gyp:ppapi_c',
+      ],
+      'include_dirs': [
+        'include',
+      ],
+      'defines': [
+        # Do not export internal Mesa funcations. Exporting them is not
+        # required because we are compiling both - API dispatcher and driver
+        # into a single library.
+        'PUBLIC=',
+        # Define a new PPAPI platform.
+        '_EGL_PLATFORM_PPAPI=_EGL_NUM_PLATFORMS',
+        '_EGL_NATIVE_PLATFORM=_EGL_PLATFORM_PPAPI',
+      ],
+      'conditions': [
+        ['OS=="win"', {
+          'defines': [
+            '_EGL_OS_WINDOWS',
+          ],
+        }],
+        ['OS=="mac"', {
+          # TODO(alokp): Make this compile on mac.
+          'suppress_wildcard': 1,
+        }],
+      ],
+      'sources': [
+        # Mesa EGL API dispatcher sources.
+        '<@(mesa_egl_sources)',
+        # PPAPI EGL driver sources.
+        'egl/egldriver.c',
+        'egl/egldriver_ppapi.c',
+      ],
+    },
+  ],
+}