Pass through files with {.i,.ii} extension (pre-processed) to clang instead of aborting.
Pass through files with {.i,.ii} extension (pre-processed) to clang
instead of aborting.

BUG=none (tried to compile a pre-processed file downloaded from a bug tracker, and failed)

Review URL: https://chromiumcodereview.appspot.com/10916164

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@9710 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

sbc100/native_client,nacl-webkit/native_client,sbc100/native_client,sbc100/native_client,nacl-webkit/native_client,sbc100/native_client,sbc100/native_client,nacl-webkit/native_client,nacl-webkit/native_client,sbc100/native_client,nacl-webkit/native_client