Fix tab strip rendering at non-integral scale factors in MD.

chrome/browser/ui/views/tabs/tab.cc

Index: chrome/browser/ui/views/tabs/tab.cc
diff --git a/chrome/browser/ui/views/tabs/tab.cc b/chrome/browser/ui/views/tabs/tab.cc
index 074495d401500b1416437c62f89643fa63176765..2a7aedc4eab57f351cb3217f2dc667613e40ab8d 100644
--- a/chrome/browser/ui/views/tabs/tab.cc
+++ b/chrome/browser/ui/views/tabs/tab.cc
@@ -1656,7 +1656,9 @@ void Tab::ScheduleIconPaint() {
 
 void Tab::GetFillPath(float scale, SkPath* fill) const {
   const float right = width() * scale;
-  const float bottom = height() * scale;
+  // The bottom of the tab needs to be pixel-aligned or else when we call
+  // ClipPath with anti-aliasing enabled it can cause artifacts.
+  const float bottom = std::ceil(height() * scale);
   const float unscaled_endcap_width = GetUnscaledEndcapWidth();
 
   fill->moveTo(right - 1, bottom);