Key frame non-RD mode decision process

This commit makes a non-RD coding mode decision process for key
frame coding. It can be optionally turned on in speed -6 and above.

Change-Id: I0847258b392877a0210b4768bef88ebc9ad009b5
diff --git a/vp9/encoder/vp9_pickmode.h b/vp9/encoder/vp9_pickmode.h
index 23d347d..57a1cf9 100644
--- a/vp9/encoder/vp9_pickmode.h
+++ b/vp9/encoder/vp9_pickmode.h
@@ -17,6 +17,9 @@
 extern "C" {
 #endif
 
+void vp9_pick_intra_mode(VP9_COMP *cpi, MACROBLOCK *x, RD_COST *rd_cost,
+                         BLOCK_SIZE bsize, PICK_MODE_CONTEXT *ctx);
+
 void vp9_pick_inter_mode(VP9_COMP *cpi, MACROBLOCK *x,
                          TileDataEnc *tile_data,
                          int mi_row, int mi_col, RD_COST *rd_cost,