Maybe from https://codereview.chromium.org/1809183002?

I ran chrome with asan enabled and got this:

=================================================================
==32632==ERROR: AddressSanitizer: odr-violation (0x7faa896de0c0):
  [1] size=48 'vtable for gpu::CommandBufferHelper' ../../gpu/command_buffer/client/cmd_buffer_helper.cc
  [2] size=48 'vtable for gpu::CommandBufferHelper' ../../gpu/command_buffer/client/cmd_buffer_helper.cc
These globals were registered at these points:
  [1]:
    #0 0x7faa9552c7c7 in __asan_register_globals (/usr/local/google/home/danakj/s/c/src/out_desktop/Release/chrome+0x13187c7)
    #1 0x7faa7857644b in asan.module_ctor (/usr/local/google/home/danakj/s/c/src/out_desktop/Release/./libclient_sources_for_ppapi.so+0x2144b)

  [2]:
    #0 0x7faa9552c7c7 in __asan_register_globals (/usr/local/google/home/danakj/s/c/src/out_desktop/Release/chrome+0x13187c7)
    #1 0x7faa892623eb in asan.module_ctor (/usr/local/google/home/danakj/s/c/src/out_desktop/Release/./libgpu.so+0xe83eb)

==32632==HINT: if you don't care about these errors you may set ASAN_OPTIONS=detect_odr_violation=0
SUMMARY: AddressSanitizer: odr-violation: global 'vtable for gpu::CommandBufferHelper' at ../../gpu/command_buffer/client/cmd_buffer_helper.cc
==32632==ABORTING