vp8_impl.cc: Make it possible to base postproc deblocking level for arm on qp.

webrtc/modules/video_coding/codecs/vp8/vp8_impl.h

Index: webrtc/modules/video_coding/codecs/vp8/vp8_impl.h
diff --git a/webrtc/modules/video_coding/codecs/vp8/vp8_impl.h b/webrtc/modules/video_coding/codecs/vp8/vp8_impl.h
index 376dde1280819bb8fee321754bfd3fbf2a6a59ba..7b5e000d235870984efeffe3d0a4dae1c269d3d9 100644
--- a/webrtc/modules/video_coding/codecs/vp8/vp8_impl.h
+++ b/webrtc/modules/video_coding/codecs/vp8/vp8_impl.h
@@ -135,7 +135,14 @@ class VP8DecoderImpl : public VP8Decoder {
 
   const char* ImplementationName() const override;
 
+  struct DeblockParams {
+    int max_level = 6;   // Deblocking strength: [0, 16].
+    int degrade_qp = 1;  // If QP value is below, start lowering |max_level|.
+    int min_qp = 0;      // If QP value is below, turn off deblocking.
+  };
+
  private:
+  class QpSmoother;
   int ReturnFrame(const vpx_image_t* img,
                   uint32_t timeStamp,
                   int64_t ntp_time_ms,
@@ -151,6 +158,8 @@ class VP8DecoderImpl : public VP8Decoder {
   int last_frame_width_;
   int last_frame_height_;
   bool key_frame_required_;
+  DeblockParams deblock_;
+  const std::unique_ptr<QpSmoother> qp_smoother_;
 };
 }  // namespace webrtc