Pepper: Add a C++ wrapper for the trusted file chooser.

ppapi/ppapi_cpp.gypi

 # Copyright (c) 2011 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<(nacl_ppapi_library_suffix)',
       'type': 'none',
       'all_dependent_settings': {
@@ skipping 234 matching lines @@
         'cpp/dev/scriptable_object_deprecated.h',
         'cpp/dev/scriptable_object_deprecated.cc',
 
         # Private interfaces.
         'cpp/private/flash_fullscreen.cc',
         'cpp/private/flash_fullscreen.h',
         'cpp/private/instance_private.cc',
         'cpp/private/instance_private.h',
         'cpp/private/var_private.cc',
         'cpp/private/var_private.h',
+
+        # Trusted interfaces.
+        'cpp/trusted/file_chooser_trusted.cc',
+        'cpp/trusted/file_chooser_trusted.h',
       ],
       'conditions': [
         ['OS=="win"', {
           'msvs_settings': {
             'VCCLCompilerTool': {
               'AdditionalOptions': ['/we4244'],  # implicit conversion, possible loss of data
             },
           },
         }],
         ['OS=="linux"', {
@@ skipping 32 matching lines @@
         }],
         ['OS=="mac"', {
           'xcode_settings': {
             'WARNING_CFLAGS': ['-Wextra', '-pedantic'],
            },
         }]
       ],
     },
   ],
 }