Remove PixelPackState from PackPixelsParams.

Only one flag ("reverseRowOrder") from PixelPackState was being used,
so instead of including the entire struct in PackPixelsParams, just
include the one flag.

BUG=angleproject:2718

Change-Id: I32e8b30383d198ecba9bf1719c32dda0938fc969
Reviewed-on: https://chromium-review.googlesource.com/1242210
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Yuly Novikov <ynovikov@google.com>
diff --git a/src/libANGLE/renderer/renderer_utils.h b/src/libANGLE/renderer/renderer_utils.h
index 9f0573c..64a258e 100644
--- a/src/libANGLE/renderer/renderer_utils.h
+++ b/src/libANGLE/renderer/renderer_utils.h
@@ -153,7 +153,7 @@
     PackPixelsParams(const gl::Rectangle &area,
                      const angle::Format &destFormat,
                      GLuint outputPitch,
-                     const gl::PixelPackState &pack,
+                     bool reverseRowOrderIn,
                      gl::Buffer *packBufferIn,
                      ptrdiff_t offset);
 
@@ -161,7 +161,7 @@
     const angle::Format *destFormat;
     GLuint outputPitch;
     gl::Buffer *packBuffer;
-    gl::PixelPackState pack;
+    bool reverseRowOrder;
     ptrdiff_t offset;
 };