media: Add fuzzer test for bit_reader

media/base/bit_reader_core.cc

Index: media/base/bit_reader_core.cc
diff --git a/media/base/bit_reader_core.cc b/media/base/bit_reader_core.cc
index 32d2d5301218e4c9c5a292b1fbec5bbff6303c91..237470c766943159e19dfb39b17b3da3ba4cc2ef 100644
--- a/media/base/bit_reader_core.cc
+++ b/media/base/bit_reader_core.cc
@@ -86,8 +86,11 @@ bool BitReaderCore::SkipBits(int num_bits) {
         byte_stream_provider_->GetBytes(nbytes, &byte_stream_window);
     DCHECK_GE(window_size, 0);
     DCHECK_LE(window_size, nbytes);
-    if (window_size < nbytes)
+    if (window_size < nbytes) {
+      // Note that some bytes were consumed.
+      bits_read_ += 8 * window_size;
       return false;
+    }
     num_bits -= 8 * nbytes;
     bits_read_ += 8 * nbytes;
   }