libvpx: Pull from upstream

source/libvpx/vp9/encoder/vp9_write_bit_buffer.h

Index: source/libvpx/vp9/encoder/vp9_write_bit_buffer.h
===================================================================
--- source/libvpx/vp9/encoder/vp9_write_bit_buffer.h	(revision 263011)
+++ source/libvpx/vp9/encoder/vp9_write_bit_buffer.h	(working copy)
@@ -24,29 +24,11 @@
   size_t bit_offset;
 };
 
-static size_t vp9_rb_bytes_written(struct vp9_write_bit_buffer *wb) {
-  return wb->bit_offset / CHAR_BIT + (wb->bit_offset % CHAR_BIT > 0);
-}
+size_t vp9_rb_bytes_written(struct vp9_write_bit_buffer *wb);
 
-static void vp9_wb_write_bit(struct vp9_write_bit_buffer *wb, int bit) {
-  const int off = (int)wb->bit_offset;
-  const int p = off / CHAR_BIT;
-  const int q = CHAR_BIT - 1 - off % CHAR_BIT;
-  if (q == CHAR_BIT -1) {
-    wb->bit_buffer[p] = bit << q;
-  } else {
-    wb->bit_buffer[p] &= ~(1 << q);
-    wb->bit_buffer[p] |= bit << q;
-  }
-  wb->bit_offset = off + 1;
-}
+void vp9_wb_write_bit(struct vp9_write_bit_buffer *wb, int bit);
 
-static void vp9_wb_write_literal(struct vp9_write_bit_buffer *wb,
-                              int data, int bits) {
-  int bit;
-  for (bit = bits - 1; bit >= 0; bit--)
-    vp9_wb_write_bit(wb, (data >> bit) & 1);
-}
+void vp9_wb_write_literal(struct vp9_write_bit_buffer *wb, int data, int bits);
 
 
 #ifdef __cplusplus