Reland of h264_decoder_unittests: Initial Change.

media/gpu/h264_dpb.h

Index: media/gpu/h264_dpb.h
diff --git a/media/gpu/h264_dpb.h b/media/gpu/h264_dpb.h
index e8f119f6f6a1dd3983a3ff3e63b4ff0168b57073..2af8a778379832045f7544983dd1cfcac335ead7 100644
--- a/media/gpu/h264_dpb.h
+++ b/media/gpu/h264_dpb.h
@@ -15,6 +15,7 @@
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "media/filters/h264_parser.h"
+#include "media/gpu/media_gpu_export.h"
 #include "ui/gfx/geometry/rect.h"
 
 namespace media {
@@ -24,7 +25,7 @@ class VaapiH264Picture;
 
 // A picture (a frame or a field) in the H.264 spec sense.
 // See spec at http://www.itu.int/rec/T-REC-H.264
-class H264Picture : public base::RefCounted<H264Picture> {
+class MEDIA_GPU_EXPORT H264Picture : public base::RefCounted<H264Picture> {
  public:
   using Vector = std::vector<scoped_refptr<H264Picture>>;