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vp9 svc: Make top layer non-ref: for 2 TL case

Only affects 2 temporal layer case.
Modified the flags for 2 temporal layers to make
top layer (top spatial, top temporal) a non-reference
frame, conistent with the 3 TL case.

Add mismatch check to the datarate test of changing
svc pattern on the fly, which is test for 2 temporal
layers.

This re-applies the change: 254e2f5501d,
that was reverted in: 658eb1d675.

Change-Id: Ib5fd4a7a0312c0c05329ae75baac480af34b4694

--- a/examples/vp9_spatial_svc_encoder.c

+++ b/examples/vp9_spatial_svc_encoder.c

@@ -589,6 +589,10 @@

       } else {

         ref_frame_config->frame_flags[sl] =

             VP8_EFLAG_NO_REF_ARF | VP8_EFLAG_NO_UPD_LAST | VP8_EFLAG_NO_UPD_GF;

+        if (sl == num_spatial_layers - 1)

+          ref_frame_config->frame_flags[sl] =

+              VP8_EFLAG_NO_UPD_ARF | VP8_EFLAG_NO_REF_ARF |

+              VP8_EFLAG_NO_UPD_LAST | VP8_EFLAG_NO_UPD_GF;

       }

     }

     if (tl == 0) {

--- a/test/datarate_test.cc

+++ b/test/datarate_test.cc

@@ -1879,6 +1879,13 @@

   ASSERT_NO_FATAL_FAILURE(RunLoop(&video));

   CheckLayerRateTargeting(&cfg_, number_spatial_layers_,

                           number_temporal_layers_, file_datarate_, 0.78, 1.15);

+#if CONFIG_VP9_DECODER

+  // Number of temporal layers > 1, so half of the frames in this SVC pattern

+  // will be non-reference frame and hence encoder will avoid loopfilter.

+  // Since frame dropper is off, we can expect 200 (half of the sequence)

+  // mismatched frames.

+  EXPECT_EQ(static_cast<unsigned int>(200), GetMismatchFrames());

+#endif

 }

 // Check basic rate targeting for 1 pass CBR SVC with 3 spatial layers and on

--- a/vp9/encoder/vp9_svc_layercontext.c

+++ b/vp9/encoder/vp9_svc_layercontext.c

@@ -549,6 +549,8 @@

     if (!spatial_id) {

       cpi->ref_frame_flags = VP9_LAST_FLAG;

     } else {

+      if (spatial_id == cpi->svc.number_spatial_layers - 1)

+        cpi->ext_refresh_alt_ref_frame = 0;

       cpi->ref_frame_flags = VP9_LAST_FLAG | VP9_GOLD_FLAG;

     }

   }