Port folder renaming changes from AOM

Manually cherry-picked commits:
ceef058 libvpx->libaom part2
3d26d91 libvpx -> libaom
cfea7dd vp10/ -> av1/
3a8eff7 Fix a build issue for a test
bf4202e Rename vpx to aom

Change-Id: I1b0eb5a40796e3aaf41c58984b4229a439a597dc
diff --git a/test/masked_sad_test.cc b/test/masked_sad_test.cc
index c5b5081..b9af5ad 100644
--- a/test/masked_sad_test.cc
+++ b/test/masked_sad_test.cc
@@ -20,9 +20,9 @@
 
 #include "./vpx_config.h"
 #include "./vpx_dsp_rtcd.h"
-#include "vpx/vpx_integer.h"
+#include "aom/vpx_integer.h"
 
-using libvpx_test::ACMRandom;
+using libaom_test::ACMRandom;
 
 namespace {
 const int number_of_iterations = 500;
@@ -40,7 +40,7 @@
     ref_maskedSAD_op_ = GET_PARAM(1);
   }
 
-  virtual void TearDown() { libvpx_test::ClearSystemState(); }
+  virtual void TearDown() { libaom_test::ClearSystemState(); }
 
  protected:
   MaskedSADFunc maskedSAD_op_;
@@ -97,7 +97,7 @@
     ref_maskedSAD_op_ = GET_PARAM(1);
   }
 
-  virtual void TearDown() { libvpx_test::ClearSystemState(); }
+  virtual void TearDown() { libaom_test::ClearSystemState(); }
 
  protected:
   HighbdMaskedSADFunc maskedSAD_op_;