Add extra DCHECKing to try to catch subpixel rendering on a non-opaque

chrome/browser/ui/views/bookmarks/bookmark_bar_view_test.cc

Index: chrome/browser/ui/views/bookmarks/bookmark_bar_view_test.cc
diff --git a/chrome/browser/ui/views/bookmarks/bookmark_bar_view_test.cc b/chrome/browser/ui/views/bookmarks/bookmark_bar_view_test.cc
index 8e29d52b214d5df9b26559ab06c1e6b10fd4c7fb..19f6df13fd9d93b8262db30c9d1ce3a2ffd7dc0a 100644
--- a/chrome/browser/ui/views/bookmarks/bookmark_bar_view_test.cc
+++ b/chrome/browser/ui/views/bookmarks/bookmark_bar_view_test.cc
@@ -301,6 +301,10 @@ class BookmarkBarViewEventTestBase : public ViewEventTestBase {
 
     bb_view_.reset(new BookmarkBarView(browser_.get(), NULL));
     bb_view_->set_owned_by_client();
+    // Real bookmark bars get a BookmarkBarViewBackground. Set a non-null

[msw, 2017/02/11 00:49:37]

optional nit: s/a non-null/an opaque/?

[Evan Stade, 2017/02/11 01:42:37]

Done.

+    // background here just to avoid triggering subpixel rendering issues.
+    bb_view_->set_background(
+        views::Background::CreateSolidBackground(SK_ColorWHITE));
     bb_view_->SetPageNavigator(&navigator_);
 
     AddTestData(CreateBigMenu());