gpu_tonemapper: Adjust sample points to maintain linearity

Adjust texture sample points to maintain linearity throughout the
sample range

CRs-Fixed: 1110654
Change-Id: I2c198c9f330a0b6001d2eda28c0355f2c9ecbde4
diff --git a/gpu_tonemapper/Tonemapper.h b/gpu_tonemapper/Tonemapper.h
index 1d6f808..88866d5 100644
--- a/gpu_tonemapper/Tonemapper.h
+++ b/gpu_tonemapper/Tonemapper.h
@@ -32,6 +32,8 @@
   unsigned int tonemapTexture;
   unsigned int lutXformTexture;
   unsigned int programID;
+  float lutXformScaleOffset[2];
+  float tonemapScaleOffset[2];
   EGLImageWrapper* eglImageWrapper;
   Tonemapper();