cc: widen threshold for background filter pixeltests on Windows.

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 bd38dd0a8583e723aa6c5497cef0193089135e84..33a76830ab229051d1560f0545d0bb835fb0defb 100644
--- a/cc/trees/layer_tree_host_pixeltest_filters.cc
+++ b/cc/trees/layer_tree_host_pixeltest_filters.cc
@@ -75,8 +75,8 @@ TEST_F(LayerTreeHostFiltersPixelTest, BackgroundFilterBlurOutsets) {
   blur->SetBackgroundFilters(filters);
 
 #if defined(OS_WIN)
-  // Windows has 2596 pixels off by at most 2: crbug.com/259922
-  float percentage_pixels_large_error = 6.5f;  // 2596px / (200*200), rounded up
+  // Windows has 7.6975% pixels by at most 2: crbug.com/259922
+  float percentage_pixels_large_error = 7.7f;
   float percentage_pixels_small_error = 0.0f;
   float average_error_allowed_in_bad_pixels = 1.f;
   int large_error_allowed = 2;
@@ -385,8 +385,8 @@ class ImageBackgroundFilter : public LayerTreeHostFiltersPixelTest {
     filter->SetBackgroundFilters(filters);
 
 #if defined(OS_WIN)
-    // Windows has 994 pixels off by at most 2: crbug.com/225027
-    float percentage_pixels_large_error = 2.5f;  // 994px / (200*200)
+    // Windows has 2.5875% pixels off by at most 2: crbug.com/225027
+    float percentage_pixels_large_error = 2.6f;  // 994px / (200*200)

[danakj, 2015/12/14 21:40:59]

this comment is wrong now?

     float percentage_pixels_small_error = 0.0f;
     float average_error_allowed_in_bad_pixels = 1.f;
     int large_error_allowed = 2;