libvpx: Pull from upstream

source/libvpx/test/vp8_decrypt_test.cc

Index: source/libvpx/test/vp8_decrypt_test.cc
===================================================================
--- source/libvpx/test/vp8_decrypt_test.cc	(revision 263011)
+++ source/libvpx/test/vp8_decrypt_test.cc	(working copy)
@@ -26,9 +26,9 @@
   0x89, 0x9a, 0xab, 0xbc, 0xcd, 0xde, 0xef, 0xf0
 };
 
-void encrypt_buffer(const uint8_t *src, uint8_t *dst,
-                    int size, int offset = 0) {
-  for (int i = 0; i < size; ++i) {
+void encrypt_buffer(const uint8_t *src, uint8_t *dst, size_t size,
+                    ptrdiff_t offset) {
+  for (size_t i = 0; i < size; ++i) {
     dst[i] = src[i] ^ test_key[(offset + i) & 15];
   }
 }
@@ -61,7 +61,7 @@
 
 #if CONFIG_DECRYPT
   std::vector<uint8_t> encrypted(video.frame_size());
-  encrypt_buffer(video.cxdata(), &encrypted[0], video.frame_size());
+  encrypt_buffer(video.cxdata(), &encrypted[0], video.frame_size(), 0);
   vp8_decrypt_init di = { test_decrypt_cb, &encrypted[0] };
   decoder.Control(VP8D_SET_DECRYPTOR, &di);
 #endif  // CONFIG_DECRYPT