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Force show_frame=1 when show_existing_frame=1

When showing a previously decoded frame, we need to
explicitly set the show_frame flag.

For the current frame being decoded this flag is
explicitly set in the frame header.

This should fix WebM Issue 696:
http://code.google.com/p/webm/issues/detail?id=696

Change-Id: I5751a809813f88d2ca6f62c47c3878475ff9ba8d

--- a/vp9/decoder/vp9_decodeframe.c

+++ b/vp9/decoder/vp9_decodeframe.c

@@ -1129,11 +1129,12 @@

   cm->show_existing_frame = vp9_rb_read_bit(rb);

   if (cm->show_existing_frame) {

-    // show an existing frame directly

+    // Show an existing frame directly.

     int frame_to_show = cm->ref_frame_map[vp9_rb_read_literal(rb, 3)];

     ref_cnt_fb(cm->fb_idx_ref_cnt, &cm->new_fb_idx, frame_to_show);

     pbi->refresh_frame_flags = 0;

     cm->lf.filter_level = 0;

+    cm->show_frame = 1;

     return 0;

   }