Roll src/third_party/libvpx/source/libvpx/ d6197b621..18c7f46c1 (40 commits).

third_party/libvpx/source/config/mac/x64/vpx_dsp_rtcd.h

Index: third_party/libvpx/source/config/mac/x64/vpx_dsp_rtcd.h
diff --git a/third_party/libvpx/source/config/mac/x64/vpx_dsp_rtcd.h b/third_party/libvpx/source/config/mac/x64/vpx_dsp_rtcd.h
index 2972cef83268e0845bb4abe9a4018dc4d562c5ae..a39f1d470df3d9e5ee07f205281df5abaaede04e 100644
--- a/third_party/libvpx/source/config/mac/x64/vpx_dsp_rtcd.h
+++ b/third_party/libvpx/source/config/mac/x64/vpx_dsp_rtcd.h
@@ -492,8 +492,8 @@ unsigned int vpx_mse8x8_c(const uint8_t *src_ptr, int  source_stride, const uint
 unsigned int vpx_mse8x8_sse2(const uint8_t *src_ptr, int  source_stride, const uint8_t *ref_ptr, int  recon_stride, unsigned int *sse);
 #define vpx_mse8x8 vpx_mse8x8_sse2
 
-void vpx_plane_add_noise_c(uint8_t *Start, char *noise, char blackclamp[16], char whiteclamp[16], char bothclamp[16], unsigned int Width, unsigned int Height, int Pitch);
-void vpx_plane_add_noise_sse2(uint8_t *Start, char *noise, char blackclamp[16], char whiteclamp[16], char bothclamp[16], unsigned int Width, unsigned int Height, int Pitch);
+void vpx_plane_add_noise_c(uint8_t *start, const int8_t *noise, int blackclamp, int whiteclamp, int width, int height, int pitch);
+void vpx_plane_add_noise_sse2(uint8_t *start, const int8_t *noise, int blackclamp, int whiteclamp, int width, int height, int pitch);
 #define vpx_plane_add_noise vpx_plane_add_noise_sse2
 
 void vpx_post_proc_down_and_across_mb_row_c(unsigned char *src, unsigned char *dst, int src_pitch, int dst_pitch, int cols, unsigned char *flimits, int size);