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

ppapi/ppapi.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',
+# This include forces PPAPI consumers to DEPS in third_party/mesa

[bradn, 2011/01/21 01:38:02]

Why not drop this completely and put this comment in the other file?

+# which is ~10k files and 2K dirs even for projects that do not use it. 
+#    '../third_party/mesa/mesa.gypi',
   ],
   'variables': {
     'chromium_code': 1,  # Use higher warning level.
   },
   'target_defaults': {
     'conditions': [
       # Linux shared libraries should always be built -fPIC.
       #
       # TODO(ajwong): For internal pepper plugins, which are statically linked
       # into chrome, do we want to build w/o -fPIC?  If so, how can we express
@@ skipping 241 matching lines @@
           'cflags': ['-Wextra', '-pedantic'],
         }],
         ['OS=="mac"', {
           'xcode_settings': {
             'WARNING_CFLAGS': ['-Wextra', '-pedantic'],
            },
         }]
       ],
     },
     {
-      'target_name': 'ppapi_egl',
-      'type': 'static_library',
-      'dependencies': [
-        'ppapi_c',
-      ],
-      'include_dirs': [
-        'lib/gl/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.
-        'lib/gl/egl/egldriver.c',
-        'lib/gl/egl/egldriver_ppapi.c',
-      ],
-    },
-    {
       'target_name': 'ppapi_gles2',
       'type': 'static_library',
       'dependencies': [
         'ppapi_c',
       ],
       'include_dirs': [
         'lib/gl/include',
       ],
       'sources': [
         'lib/gl/gles2/gl2ext_ppapi.c',
@@ skipping 364 matching lines @@
         ['OS=="win"', {
         }],
         ['OS=="linux"', {
         }],
         ['OS=="mac"', {
         }]
       ],
     },
   ],
 }