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Backport libaom bug fixes.

libaom commit 80a5b09337a80093e1e7ae5eb540020a22949805:
dec_free_mi: Reset cm->mi_alloc_size.

libaom commit fb0dd0bb80fc95ef016f1421b105a52fffa32816:
Clear cm->width and cm->height on alloc failure.

libaom commit ccb27264089a8cfa1334391ebbcb6a11b8dff442:
Misc. resize fixes along with the resize test
Note: only the change to enc_free_mi in av1/encoder/encoder.c
is merged.

Change-Id: I602813230d40125e59608fa013085dca3e160c33

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

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

@@ -1148,9 +1148,15 @@

     // Allocations in vp9_alloc_context_buffers() depend on individual

     // dimensions as well as the overall size.

     if (new_mi_cols > cm->mi_cols || new_mi_rows > cm->mi_rows) {

-      if (vp9_alloc_context_buffers(cm, width, height))

+      if (vp9_alloc_context_buffers(cm, width, height)) {

+        // The cm->mi_* values have been cleared and any existing context

+        // buffers have been freed. Clear cm->width and cm->height to be

+        // consistent and to force a realloc next time.

+        cm->width = 0;

+        cm->height = 0;

         vpx_internal_error(&cm->error, VPX_CODEC_MEM_ERROR,

                            "Failed to allocate context buffers");

+      }

     } else {

       vp9_set_mb_mi(cm, width, height);

     }

--- a/vp9/decoder/vp9_decoder.c

+++ b/vp9/decoder/vp9_decoder.c

@@ -69,6 +69,7 @@

   cm->mip = NULL;

   vpx_free(cm->mi_grid_base);

   cm->mi_grid_base = NULL;

+  cm->mi_alloc_size = 0;

 }

 VP9Decoder *vp9_decoder_create(BufferPool *const pool) {

--- a/vp9/encoder/vp9_encoder.c

+++ b/vp9/encoder/vp9_encoder.c

@@ -843,6 +843,7 @@

   cm->mi_grid_base = NULL;

   vpx_free(cm->prev_mi_grid_base);

   cm->prev_mi_grid_base = NULL;

+  cm->mi_alloc_size = 0;

 }

 static void vp9_swap_mi_and_prev_mi(VP9_COMMON *cm) {

-- 

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