Wrap the p2p transport API in a compile time flag.

ppapi/ppapi_cpp.gypi

 # 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.
 
 {
   'targets': [
     {
       'target_name': 'ppapi_c',
       'type': 'none',
       'all_dependent_settings': {
@@ skipping 51 matching lines @@
         'c/dev/ppb_file_system_dev.h',
         'c/dev/ppb_find_dev.h',
         'c/dev/ppb_font_dev.h',
         'c/dev/ppb_font_list_dev.h',
         'c/dev/ppb_fullscreen_dev.h',
         'c/dev/ppb_graphics_3d_dev.h',
         'c/dev/ppb_opengles_dev.h',
         'c/dev/ppb_scrollbar_dev.h',
         'c/dev/ppb_surface_3d_dev.h',
         'c/dev/ppb_testing_dev.h',
-        'c/dev/ppb_transport_dev.h',
         'c/dev/ppb_url_util_dev.h',
         'c/dev/ppb_video_decoder_dev.h',
         'c/dev/ppb_widget_dev.h',
         'c/dev/ppb_zoom_dev.h',
         'c/dev/ppp_cursor_control_dev.h',
         'c/dev/ppp_find_dev.h',
         'c/dev/ppp_graphics_3d_dev.h',
         'c/dev/ppp_scrollbar_dev.h',
         'c/dev/ppp_selection_dev.h',
         'c/dev/ppp_printing_dev.h',
@@ skipping 18 matching lines @@
 
         # Trusted interfaces.
         'c/trusted/ppb_audio_trusted.h',
         'c/trusted/ppb_image_data_trusted.h',
         'c/trusted/ppb_broker_trusted.h',
         'c/trusted/ppb_instance_trusted.h',
         'c/trusted/ppb_url_loader_trusted.h',
         'c/trusted/ppp_broker.h',
         'c/trusted/ppp_instance_trusted.h',
       ],
+      'conditions': [
+        ['ppapi_transport==1', {
+          'sources': [
+            'c/dev/ppb_transport_dev.h',
+          ],
+        }],
+      ],
     },
     {
       'target_name': 'ppapi_cpp_objects',
       'type': 'static_library',
       'dependencies': [
         'ppapi_c'
       ],
       'include_dirs': [
         '..',
       ],
@@ skipping 64 matching lines @@
         'cpp/dev/graphics_3d_dev.cc',
         'cpp/dev/graphics_3d_dev.h',
         'cpp/dev/printing_dev.cc',
         'cpp/dev/printing_dev.h',
         'cpp/dev/scrollbar_dev.cc',
         'cpp/dev/scrollbar_dev.h',
         'cpp/dev/selection_dev.cc',
         'cpp/dev/selection_dev.h',
         'cpp/dev/surface_3d_dev.cc',
         'cpp/dev/surface_3d_dev.h',
-        'cpp/dev/transport_dev.cc',
-        'cpp/dev/transport_dev.h',
         'cpp/dev/url_util_dev.cc',
         'cpp/dev/url_util_dev.h',
         'cpp/dev/video_decoder_dev.cc',
         'cpp/dev/video_decoder_dev.h',
         'cpp/dev/widget_client_dev.cc',
         'cpp/dev/widget_client_dev.h',
         'cpp/dev/widget_dev.cc',
         'cpp/dev/widget_dev.h',
         'cpp/dev/zoom_dev.cc',
         'cpp/dev/zoom_dev.h',
@@ skipping 15 matching lines @@
             },
           },
         }],
         ['OS=="linux"', {
           'cflags': ['-Wextra', '-pedantic'],
         }],
         ['OS=="mac"', {
           'xcode_settings': {
             'WARNING_CFLAGS': ['-Wextra', '-pedantic'],
            },
-        }]
+        }],
+        ['ppapi_transport==1', {
+          'sources': [
+            'cpp/dev/transport_dev.cc',
+            'cpp/dev/transport_dev.h',
+          ],
+        }],
       ],
     },
     {
       'target_name': 'ppapi_cpp',
       'type': 'static_library',
       'dependencies': [
         'ppapi_c',
         'ppapi_cpp_objects',
       ],
       'include_dirs': [
@@ skipping 12 matching lines @@
         }],
         ['OS=="mac"', {
           'xcode_settings': {
             'WARNING_CFLAGS': ['-Wextra', '-pedantic'],
            },
         }]
       ],
     },
   ],
 }