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Add USE_BUF_FRAME enum to FRAME_UPDATE_TYPE

This enum indicates the use of show existing frame, and conducts
no reference frame buffer update.

Change-Id: I8bf3121376640baf24b580ebea58e9ccbdd641da

--- a/vp9/encoder/vp9_firstpass.h

+++ b/vp9/encoder/vp9_firstpass.h

@@ -116,12 +116,13 @@

   GF_UPDATE = 2,

   ARF_UPDATE = 3,

   OVERLAY_UPDATE = 4,

-  BRF_UPDATE = 5,            // Backward Reference Frame

-  LAST_BIPRED_UPDATE = 6,    // Last Bi-predictive Frame

-  BIPRED_UPDATE = 7,         // Bi-predictive Frame, but not the last one

-  INTNL_OVERLAY_UPDATE = 8,  // Internal Overlay Frame

-  INTNL_ARF_UPDATE = 9,      // Internal Altref Frame (candidate for ALTREF2)

-  FRAME_UPDATE_TYPES = 10

+  USE_BUF_FRAME = 5,         // Use show existing frame, no ref buffer update

+  BRF_UPDATE = 6,            // Backward Reference Frame

+  LAST_BIPRED_UPDATE = 7,    // Last Bi-predictive Frame

+  BIPRED_UPDATE = 8,         // Bi-predictive Frame, but not the last one

+  INTNL_OVERLAY_UPDATE = 9,  // Internal Overlay Frame

+  INTNL_ARF_UPDATE = 10,     // Internal Altref Frame (candidate for ALTREF2)

+  FRAME_UPDATE_TYPES = 11

 } FRAME_UPDATE_TYPE;

 #define FC_ANIMATION_THRESH 0.15