libvpx: Pull from upstream

source/libvpx/test/sad_test.cc

Index: source/libvpx/test/sad_test.cc
===================================================================
--- source/libvpx/test/sad_test.cc	(revision 177019)
+++ source/libvpx/test/sad_test.cc	(working copy)
@@ -21,6 +21,7 @@
 }
 
 #include "test/acm_random.h"
+#include "test/register_state_check.h"
 #include "test/util.h"
 #include "third_party/googletest/src/include/gtest/gtest.h"
 
@@ -65,9 +66,11 @@
 
   sad_m_by_n_fn_t sad_fn_;
   virtual unsigned int SAD(unsigned int max_sad) {
-    return sad_fn_(source_data_, source_stride_,
-                   reference_data_, reference_stride_,
-                   max_sad);
+    unsigned int ret;
+    REGISTER_STATE_CHECK(ret = sad_fn_(source_data_, source_stride_,
+                                       reference_data_, reference_stride_,
+                                       max_sad));
+    return ret;
   }
 
   // Sum of Absolute Differences. Given two blocks, calculate the absolute