Make ipc_tests file structure a little saner and add an ipc_perftests target.

This means that the (one, semi-manual) IPC perf test that we have will build
without manual hackery (and do so separately from the ipc_tests target).


Review URL: https://chromiumcodereview.appspot.com/11819041

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@176341 0039d316-1c4b-4281-b951-d872f2087c98

• build/android/gtest_filter/ipc_tests_disabled[diff]
• ipc/ipc.gyp[diff]
• ipc/ipc_channel_unittest.cc[Added - diff]
• ipc/ipc_fuzzing_tests.cc[diff]
• ipc/ipc_perftests.cc[Added - diff]
• ipc/ipc_send_fds_test.cc[diff]
• ipc/ipc_test_base.cc[Added - diff]
• ipc/ipc_test_base.h[Renamed from ipc/ipc_tests.h - diff]
• ipc/ipc_tests.cc[Deleted - diff]
• ipc/sync_socket_unittest.cc[diff]