bench: Fix a couple presumed copy/paste errors

We switch to FILTER_HEIGHT_SMALL when fIsSmall.

Change-Id: I5d21eacbee29a349caa96815b2059c0bebd819e2
Reviewed-on: https://skia-review.googlesource.com/c/190563
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
diff --git a/bench/DisplacementBench.cpp b/bench/DisplacementBench.cpp
index 37d53d1..97c008a 100644
--- a/bench/DisplacementBench.cpp
+++ b/bench/DisplacementBench.cpp
@@ -32,7 +32,7 @@
 
     void makeBitmap() {
         const int w = this->isSmall() ? FILTER_WIDTH_SMALL : FILTER_WIDTH_LARGE;
-        const int h = this->isSmall() ? FILTER_HEIGHT_LARGE : FILTER_HEIGHT_LARGE;
+        const int h = this->isSmall() ? FILTER_HEIGHT_SMALL : FILTER_HEIGHT_LARGE;
         fBitmap.allocN32Pixels(w, h);
         SkCanvas canvas(fBitmap);
         canvas.clear(0x00000000);
@@ -46,7 +46,7 @@
 
     void makeCheckerboard() {
         const int w = this->isSmall() ? FILTER_WIDTH_SMALL : FILTER_WIDTH_LARGE;
-        const int h = this->isSmall() ? FILTER_HEIGHT_LARGE : FILTER_HEIGHT_LARGE;
+        const int h = this->isSmall() ? FILTER_HEIGHT_SMALL : FILTER_HEIGHT_LARGE;
         auto surface(SkSurface::MakeRasterN32Premul(w, h));
         SkCanvas* canvas = surface->getCanvas();
         canvas->clear(0x00000000);