Adding macro to enable changing SSL library (Part 1)

build/common.gypi

 # Copyright (c) 2012 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.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   # Variables expected to be overriden on the GYP command line (-D) or by
   # ~/.gyp/include.gypi.
@@ skipping 722 matching lines @@
           'os_bsd%': 0,
         }],
 
         # NSS usage.
         ['(OS=="linux" or OS=="freebsd" or OS=="openbsd" or OS=="solaris")', {
           'use_nss_certs%': 1,
         }, {
           'use_nss_certs%': 0,
         }],
 
+        # NSS verifier usage.

[davidben, 2016/03/17 19:48:08]

Nit: Maybe add "On non-OpenSSL iOS configurations, certificates use the
operating system library, but the verifier uses the bundled copy of NSS."

[svaldez, 2016/03/17 20:04:18]

Done.

+        ['(OS=="linux" or OS=="freebsd" or OS=="openbsd" or OS=="solaris") or (OS=="ios" and use_openssl==0)', {
+          'use_nss_verifier%': 1,
+        }, {
+          'use_nss_verifier%': 0,
+        }],
+
         # libudev usage.  This currently only affects the content layer.
         ['OS=="linux" and embedded==0', {
           'use_udev%': 1,
         }, {
           'use_udev%': 0,
         }],
 
         # Flags to use X11 on non-Mac POSIX platforms.
         ['OS=="win" or OS=="mac" or OS=="ios" or OS=="android" or use_ozone==1', {
           'use_x11%': 0,
@@ skipping 386 matching lines @@
     'host_arch%': '<(host_arch)',
     'toolkit_views%': '<(toolkit_views)',
     'ui_compositor_image_transport%': '<(ui_compositor_image_transport)',
     'use_aura%': '<(use_aura)',
     'use_ash%': '<(use_ash)',
     'use_cras%': '<(use_cras)',
     'use_libpci%': '<(use_libpci)',
     'use_openssl%': '<(use_openssl)',
     'use_openssl_certs%': '<(use_openssl_certs)',
     'use_nss_certs%': '<(use_nss_certs)',
+    'use_nss_verifier%': '<(use_nss_verifier)',
     'use_udev%': '<(use_udev)',
     'os_bsd%': '<(os_bsd)',
     'os_posix%': '<(os_posix)',
     'use_dbus%': '<(use_dbus)',
     'use_glib%': '<(use_glib)',
     'use_pango%': '<(use_pango)',
     'use_cairo%': '<(use_cairo)',
     'use_ozone%': '<(use_ozone)',
     'use_ozone_evdev%': '<(use_ozone_evdev)',
     'use_xkbcommon%': '<(use_xkbcommon)',
@@ skipping 946 matching lines @@
       }],
       ['use_aura==1', {
         'grit_defines': ['-D', 'use_aura'],
       }],
       ['use_ash==1', {
         'grit_defines': ['-D', 'use_ash'],
       }],
       ['use_nss_certs==1', {
         'grit_defines': ['-D', 'use_nss_certs'],
       }],
+      ['use_nss_verifier==1', {
+        'grit_defines': ['-D', 'use_nss_verifier'],
+      }],
       ['use_ozone==1', {
         'grit_defines': ['-D', 'use_ozone'],
       }],
       ['image_loader_extension==1', {
         'grit_defines': ['-D', 'image_loader_extension'],
       }],
       ['use_titlecase_in_grd==1', {
         'grit_defines': ['-D', 'use_titlecase'],
       }],
       ['OS=="android"', {
@@ skipping 941 matching lines @@
           'USE_OPENSSL=1',
           'USE_OPENSSL_CERTS=1',
         ],
       }],
       ['<(use_glib)==1 and >(nacl_untrusted_build)==0', {
         'defines': ['USE_GLIB=1'],
       }],
       ['<(use_nss_certs)==1 and >(nacl_untrusted_build)==0', {
         'defines': ['USE_NSS_CERTS=1'],
       }],
+      ['<(use_nss_verifier)==1 and >(nacl_untrusted_build)==0', {
+        'defines': ['USE_NSS_VERIFIER=1'],
+      }],
       ['<(chromeos)==1 and >(nacl_untrusted_build)==0', {
         'defines': ['OS_CHROMEOS=1'],
       }],
       ['enable_wexit_time_destructors==1 and OS!="win"', {
         # TODO: Enable on Windows too, http://crbug.com/404525
         'variables': { 'clang_warning_flags': ['-Wexit-time-destructors']},
       }],
       ['chromium_code==0', {
         'variables': {
           'clang_warning_flags': [
@@ skipping 3277 matching lines @@
     # settings in target dicts.  SYMROOT is a special case, because many other
     # Xcode variables depend on it, including variables such as
     # PROJECT_DERIVED_FILE_DIR.  When a source group corresponding to something
     # like PROJECT_DERIVED_FILE_DIR is added to a project, in order for the
     # files to appear (when present) in the UI as actual files and not red
     # red "missing file" proxies, the correct path to PROJECT_DERIVED_FILE_DIR,
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }