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/video_source.h b/test/video_source.h
index 94a95ce..7fde59c 100644
--- a/test/video_source.h
+++ b/test/video_source.h
@@ -20,9 +20,9 @@
 #include <cstdlib>
 #include <string>
 #include "test/acm_random.h"
-#include "vpx/vpx_encoder.h"
+#include "aom/vpx_encoder.h"
 
-namespace libvpx_test {
+namespace libaom_test {
 
 // Helper macros to ensure LIBVPX_TEST_DATA_PATH is a quoted string.
 // These are undefined right below GetDataPath
@@ -250,6 +250,6 @@
   virtual unsigned int frame_number() const = 0;
 };
 
-}  // namespace libvpx_test
+}  // namespace libaom_test
 
 #endif  // TEST_VIDEO_SOURCE_H_