Draw infobar arrow border with width of 1px on any scale factor.

chrome/browser/ui/infobar_container_delegate.cc

Index: chrome/browser/ui/infobar_container_delegate.cc
diff --git a/chrome/browser/ui/infobar_container_delegate.cc b/chrome/browser/ui/infobar_container_delegate.cc
index f033de3b678b2c77ae996819092053b412789ad2..86da9d850467f6b31c868809d03da14085e3a2fe 100644
--- a/chrome/browser/ui/infobar_container_delegate.cc
+++ b/chrome/browser/ui/infobar_container_delegate.cc
@@ -12,6 +12,22 @@
 #include "ui/views/window/non_client_view.h"
 #endif
 
+namespace {
+
+int GetDefaultArrowTargetHeight() {
+  return ui::MaterialDesignController::IsModeMaterial()
+             ? InfoBarContainerDelegate::kDefaultArrowTargetHeightMd
+             : InfoBarContainerDelegate::kDefaultArrowTargetHeight;
+}
+
+int GetDefaultArrowTargetHalfWidth() {
+  return ui::MaterialDesignController::IsModeMaterial()
+             ? InfoBarContainerDelegate::kDefaultArrowTargetHalfWidthMd
+             : InfoBarContainerDelegate::kDefaultArrowTargetHalfWidth;
+}
+
+}  // namespace
+
 // static
 #if defined(OS_MACOSX)
 const int InfoBarContainerDelegate::kSeparatorLineHeight = 1;
@@ -21,6 +37,7 @@ const int InfoBarContainerDelegate::kDefaultArrowTargetHeight = 11;
 const int InfoBarContainerDelegate::kSeparatorLineHeight =
     views::NonClientFrameView::kClientEdgeThickness;
 const int InfoBarContainerDelegate::kDefaultArrowTargetHeight = 9;
+const int InfoBarContainerDelegate::kDefaultArrowTargetHeightMd = 11;
 #endif
 
 const int InfoBarContainerDelegate::kDefaultBarTargetHeight = 36;
@@ -28,6 +45,8 @@ const int InfoBarContainerDelegate::kDefaultBarTargetHeightMd = 40;
 const int InfoBarContainerDelegate::kMaximumArrowTargetHeight = 24;
 const int InfoBarContainerDelegate::kDefaultArrowTargetHalfWidth =
     kDefaultArrowTargetHeight;
+const int InfoBarContainerDelegate::kDefaultArrowTargetHalfWidthMd =
+    kDefaultArrowTargetHeightMd;
 const int InfoBarContainerDelegate::kMaximumArrowTargetHalfWidth = 14;
 
 InfoBarContainerDelegate::InfoBarContainerDelegate()
@@ -55,13 +74,14 @@ int InfoBarContainerDelegate::ArrowTargetHeightForInfoBar(
   if (index == 0)
     return top_arrow_target_height_;
   if ((index > 1) || animation.IsShowing())
-    return kDefaultArrowTargetHeight;
+    return GetDefaultArrowTargetHeight();
   // When the first infobar is animating closed, we animate the second infobar's
   // arrow target height from the default to the top target height.  Note that
   // the animation values here are going from 1.0 -> 0.0 as the top bar closes.
-  return top_arrow_target_height_ + static_cast<int>(
-      (kDefaultArrowTargetHeight - top_arrow_target_height_) *
-          animation.GetCurrentValue());
+  return top_arrow_target_height_ +
+         static_cast<int>(
+             (GetDefaultArrowTargetHeight() - top_arrow_target_height_) *
+             animation.GetCurrentValue());
 }
 
 void InfoBarContainerDelegate::ComputeInfoBarElementSizes(
@@ -86,8 +106,9 @@ void InfoBarContainerDelegate::ComputeInfoBarElementSizes(
     // When the infobar is not animating (i.e. fully open), we set the
     // half-width to be proportionally the same distance between its default and
     // maximum values as the height is between its.
-    *arrow_half_width = kDefaultArrowTargetHalfWidth +
-        ((kMaximumArrowTargetHalfWidth - kDefaultArrowTargetHalfWidth) *
+    *arrow_half_width =
+        GetDefaultArrowTargetHalfWidth() +
+        ((kMaximumArrowTargetHalfWidth - GetDefaultArrowTargetHalfWidth()) *
          ((*arrow_height - kDefaultArrowTargetHeight) /
           (kMaximumArrowTargetHeight - kDefaultArrowTargetHeight)));
   }