Show InkDrops on toolbar-button focus outside Mac

Highlights the ToolbarButton inkdrop on platforms where focus rings are
not used. Before this change toolbar buttons were not highlighted to
reflect their focused state (outside of Mac where focus rings are used).

Bug: chromium:856505
Change-Id: Iab3578ff75a12477afa11ce34a09836acc3514d9
Reviewed-on: https://chromium-review.googlesource.com/1115737Reviewed-by: Bret Sepulveda <bsep@chromium.org>
Commit-Queue: Peter Boström <pbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#570561}

chrome/browser/ui/views/toolbar/toolbar_ink_drop_util.h

@@ -19,6 +19,7 @@
 #include "ui/views/animation/ink_drop_impl.h"
 #include "ui/views/animation/ink_drop_mask.h"
 #include "ui/views/animation/ink_drop_ripple.h"
+#include "ui/views/style/platform_style.h"
 
 constexpr float kToolbarInkDropVisibleOpacity = 0.06f;
 constexpr float kToolbarInkDropHighlightVisibleOpacity = 0.08f;
@@ -72,6 +73,8 @@ std::unique_ptr<views::InkDrop> CreateToolbarInkDrop(
   ink_drop->SetAutoHighlightMode(
       views::InkDropImpl::AutoHighlightMode::SHOW_ON_RIPPLE);
   ink_drop->SetShowHighlightOnHover(true);
+  ink_drop->SetShowHighlightOnFocus(!views::PlatformStyle::kPreferFocusRings);
+
   return ink_drop;
 }