Add prefix to empty param tests.

googletest will no longer support empty prefix
for parameterized INSTANTIATE_TEST_SUITE_P.
Adding "All" prefix to existing empty prefix test suites.

This CL was uploaded by git cl split.

R=kcwu@chromium.org

Bug: 1023677
Change-Id: I32c8ed6a484a6eafb0aa0e67cb393b9cae6c6275
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1926796
Auto-Submit: Ilia Samsonov <isamsonov@google.com>
Reviewed-by: Andres Calderon Jaramillo <andrescj@chromium.org>
Reviewed-by: Kuang-che Wu <kcwu@chromium.org>
Commit-Queue: Ilia Samsonov <isamsonov@google.com>
Cr-Commit-Position: refs/heads/master@{#717688}

media/gpu/vaapi/vaapi_webp_decoder_unittest.cc

@@ -209,7 +209,7 @@ TEST_P(VaapiWebPDecoderTest, DecodeAndExportAsNativePixmapDmaBuf) {
 // TODO(crbug.com/986073): expand test coverage. See
 // vaapi_jpeg_decoder_unittest.cc as reference:
 // cs.chromium.org/chromium/src/media/gpu/vaapi/vaapi_jpeg_decoder_unittest.cc
-INSTANTIATE_TEST_SUITE_P(,
+INSTANTIATE_TEST_SUITE_P(All,
                          VaapiWebPDecoderTest,
                          testing::ValuesIn(kTestCases),
                          vaapi_test_utils::TestParamToString);