vp8: fix decoder crash with invalid leading keyframes

decoding the same invalid keyframe twice would result in a crash as the
second time through the decoder would be assumed to have been
initialized as there was no resolution change. in this case the
resolution was itself invalid (0x6), but vp8_peek_si() was only failing
in the case of 0x0.
invalid-vp80-00-comprehensive-018.ivf.2kf_0x6.ivf tests this case by
duplicating the first keyframe and additionally adds a valid one to
ensure decoding can resume without error.

BUG=b/30593765

Change-Id: If0859035908b7870d67a7f3f646b5a080252eb6d

test/invalid_file_test.cc

@@ -158,6 +158,13 @@ class InvalidFileInvalidPeekTest : public InvalidFileTest {
 
 TEST_P(InvalidFileInvalidPeekTest, ReturnCode) { RunTest(); }
 
+const DecodeParam kVP8InvalidFileTests[] = {
+  { 1, "invalid-vp80-00-comprehensive-018.ivf.2kf_0x6.ivf" },
+};
+
+VP8_INSTANTIATE_TEST_CASE(InvalidFileInvalidPeekTest,
+                          ::testing::ValuesIn(kVP8InvalidFileTests));
+
 const DecodeParam kVP9InvalidFileInvalidPeekTests[] = {
   { 1, "invalid-vp90-01-v3.webm" },
 };
@@ -165,6 +172,7 @@ const DecodeParam kVP9InvalidFileInvalidPeekTests[] = {
 VP9_INSTANTIATE_TEST_CASE(InvalidFileInvalidPeekTest,
                           ::testing::ValuesIn(kVP9InvalidFileInvalidPeekTests));
 
+#if CONFIG_VP9_DECODER
 const DecodeParam kMultiThreadedVP9InvalidFileTests[] = {
   { 4, "invalid-vp90-2-08-tile_1x4_frame_parallel_all_key.webm" },
   { 4,
@@ -182,4 +190,5 @@ INSTANTIATE_TEST_CASE_P(
         ::testing::Values(
             static_cast<const libvpx_test::CodecFactory *>(&libvpx_test::kVP9)),
         ::testing::ValuesIn(kMultiThreadedVP9InvalidFileTests)));
+#endif  // CONFIG_VP9_DECODER
 }  // namespace