Adding 3D lut color filter

include/gpu/GrTypes.h

Index: include/gpu/GrTypes.h
diff --git a/include/gpu/GrTypes.h b/include/gpu/GrTypes.h
index 22b2e224f6edd3dbe513adb6215d1502d569403a..7df2e6022134719ac746a5c64aec636bf44d064d 100644
--- a/include/gpu/GrTypes.h
+++ b/include/gpu/GrTypes.h
@@ -471,6 +471,7 @@ struct GrTextureDesc {
     , fOrigin(kDefault_GrSurfaceOrigin)
     , fWidth(0)
     , fHeight(0)
+    , fDepth(0)
     , fConfig(kUnknown_GrPixelConfig)
     , fSampleCnt(0) {
     }
@@ -479,6 +480,7 @@ struct GrTextureDesc {
     GrSurfaceOrigin        fOrigin; //!< origin of the texture
     int                    fWidth;  //!< Width of the texture
     int                    fHeight; //!< Height of the texture
+    int                    fDepth;  //!< Depth of the texture
 
     /**
      * Format of source data of the texture. Not guaranteed to be the same as