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

libsrtp.gyp

Index: libsrtp.gyp
===================================================================
--- libsrtp.gyp	(revision 292049)
+++ libsrtp.gyp	(working copy)
@@ -61,6 +61,16 @@
           '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. Without this, aes_cbc_alloc will allocate an
+          # aes_cbc_ctx_t not 64-bit aligned and the v128_t members of
+          # aes_cbc_ctx_t will not be 64-bit aligned, which breaks the
+          # compiler optimizations that assume 64-bit alignment of v128_t.
+          'FORCE_64BIT_ALIGN',
+        ],
+      }],
     ],
     'direct_dependent_settings': {
       'include_dirs': [