always scale to an integer; compensate for fractional image sizes by leaving the fractional scale i…

tests/ScaledImageCache.cpp

Index: tests/ScaledImageCache.cpp
diff --git a/tests/ScaledImageCache.cpp b/tests/ScaledImageCache.cpp
index 276a3cc17a4549b1d39d09af1277ab0b576a88a8..ffab2adee7c29e201354fb19560ec1108072ff5b 100644
--- a/tests/ScaledImageCache.cpp
+++ b/tests/ScaledImageCache.cpp
@@ -17,7 +17,9 @@ static bool is_in_scaled_image_cache(const SkBitmap& orig,
                                      SkScalar xScale,
                                      SkScalar yScale) {
     SkBitmap scaled;
-    return SkBitmapCache::Find(orig, SkScalarInvert(xScale), SkScalarInvert(yScale), &scaled);
+    float roundedImageWidth = SkScalarRoundToScalar(orig.width() * xScale);
+    float roundedImageHeight = SkScalarRoundToScalar(orig.height() * xScale);
+    return SkBitmapCache::Find(orig, roundedImageWidth, roundedImageHeight, &scaled);
 }
 
 // Draw a scaled bitmap, then return true iff it has been cached.