Rename display_{size,width,height} to render_*.

The name "display_*" (or "d_*") is used for non-compatible information
(that is, the cropped frame dimensions in pixels, as opposed to the
intended screen rendering surface size). Therefore, continuing to use
display_* would be confusing to end users. Instead, rename the field
to render_*, so that struct vpx_image can include it.

Change-Id: Iab8d2eae96492b71c4ea60c4bce8121cb2a1fe2d
diff --git a/vp9/decoder/vp9_decodeframe.c b/vp9/decoder/vp9_decodeframe.c
index ba8c8dd..0cd1648 100644
--- a/vp9/decoder/vp9_decodeframe.c
+++ b/vp9/decoder/vp9_decodeframe.c
@@ -1181,11 +1181,11 @@
                              : literal_to_filter[vpx_rb_read_literal(rb, 2)];
 }
 
-static void setup_display_size(VP9_COMMON *cm, struct vpx_read_bit_buffer *rb) {
-  cm->display_width = cm->width;
-  cm->display_height = cm->height;
+static void setup_render_size(VP9_COMMON *cm, struct vpx_read_bit_buffer *rb) {
+  cm->render_width = cm->width;
+  cm->render_height = cm->height;
   if (vpx_rb_read_bit(rb))
-    vp9_read_frame_size(rb, &cm->display_width, &cm->display_height);
+    vp9_read_frame_size(rb, &cm->render_width, &cm->render_height);
 }
 
 static void resize_mv_buffer(VP9_COMMON *cm) {
@@ -1233,7 +1233,7 @@
   BufferPool *const pool = cm->buffer_pool;
   vp9_read_frame_size(rb, &width, &height);
   resize_context_buffers(cm, width, height);
-  setup_display_size(cm, rb);
+  setup_render_size(cm, rb);
 
   lock_buffer_pool(pool);
   if (vpx_realloc_frame_buffer(
@@ -1315,7 +1315,7 @@
   }
 
   resize_context_buffers(cm, width, height);
-  setup_display_size(cm, rb);
+  setup_render_size(cm, rb);
 
   lock_buffer_pool(pool);
   if (vpx_realloc_frame_buffer(