Increase allowed percentage of pixels that differ in ImageBackgroundFilter.BackgroundFilterRotated_…

cc/trees/layer_tree_host_pixeltest_filters.cc

Index: cc/trees/layer_tree_host_pixeltest_filters.cc
diff --git a/cc/trees/layer_tree_host_pixeltest_filters.cc b/cc/trees/layer_tree_host_pixeltest_filters.cc
index 92abb20a8572b23754d4025ab68a60baa3945198..27f8e2c9aff16851bd08cb3ebec67e8625ae1c63 100644
--- a/cc/trees/layer_tree_host_pixeltest_filters.cc
+++ b/cc/trees/layer_tree_host_pixeltest_filters.cc
@@ -438,7 +438,7 @@ class ImageBackgroundFilter : public LayerTreeHostFiltersPixelTest {
 
     // Allow some fuzziness so that this doesn't fail when Skia makes minor
     // changes to blur or rectangle rendering.
-    float percentage_pixels_large_error = 3.1f;
+    float percentage_pixels_large_error = 4.f;
     float percentage_pixels_small_error = 0.0f;
     float average_error_allowed_in_bad_pixels = 2.f;
     int large_error_allowed = 2;