Use FORCE_64BIT_ALIGN to make sure that aes_cbc_ctx_t allocated by aes_cbc_alloc is 64-bit aligned.

libsrtp.gyp

 # 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.
 
 {
   'variables': {
     'use_system_libsrtp%': 0,
   },
   'target_defaults': {
     'defines': [
@@ skipping 43 matching lines @@
           # just work just fine, it has been tested on android/arm with srtp
           # test applications and libjingle.
           'CPU_CISC',
         ],
       }],
       ['target_arch=="mipsel" or target_arch=="mips64el"', {
         'defines': [
           'CPU_RISC',
         ],
       }],
+      ['target_arch=="mipsel" or target_arch=="arm" or target_arch=="armv7" or target_arch=="ia32"', {
+        'defines': [
+          # Define FORCE_64BIT_ALIGN to avoid alignment-related-crashes like
+          # crbug/414919.

[Sergey Ulanov, 2014/09/22 21:57:52]

It would be useful to have more details here to explain what it does and why it
is necessary. Currently one has to read the bug to figure it out. 

+          'FORCE_64BIT_ALIGN',
+        ],
+      }],
     ],
     'direct_dependent_settings': {
       'include_dirs': [
         './config',
         'srtp/include',
         'srtp/crypto/include',
       ],
       'conditions': [
         ['os_posix==1', {
           'defines': [
@@ skipping 293 matching lines @@
           'link_settings': {
             'libraries': [
               '-lsrtp',
             ],
           },
         }, # target libsrtp
       ], # targets
     }],
   ],
 }