Replace manual case/switch with PlatformEnumToCSSValueID

This code previously had a hard-coded list of border styles,
which can instead be retrieved from the CSS value tables.

No behavior changes are expected.

Change-Id: Ib416ba444e5a99b28457007b41a09db83f5e16cb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2373422
Auto-Submit: Mason Freed <masonfreed@chromium.org>
Commit-Queue: Philip Rogers <pdr@chromium.org>
Reviewed-by: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801534}

third_party/blink/renderer/core/layout/layout_tree_as_text.cc

@@ -26,6 +26,7 @@
 #include "third_party/blink/renderer/core/layout/layout_tree_as_text.h"
 
 #include "third_party/blink/renderer/core/css/css_property_value_set.h"
+#include "third_party/blink/renderer/core/css/css_value_id_mappings.h"
 #include "third_party/blink/renderer/core/display_lock/display_lock_context.h"
 #include "third_party/blink/renderer/core/dom/document.h"
 #include "third_party/blink/renderer/core/dom/pseudo_element.h"
@@ -72,40 +73,7 @@ namespace blink {
 
 static void PrintBorderStyle(WTF::TextStream& ts,
                              const EBorderStyle border_style) {
-  switch (border_style) {
-    case EBorderStyle::kNone:
-      ts << "none";
-      break;
-    case EBorderStyle::kHidden:
-      ts << "hidden";
-      break;
-    case EBorderStyle::kInset:
-      ts << "inset";
-      break;
-    case EBorderStyle::kGroove:
-      ts << "groove";
-      break;
-    case EBorderStyle::kRidge:
-      ts << "ridge";
-      break;
-    case EBorderStyle::kOutset:
-      ts << "outset";
-      break;
-    case EBorderStyle::kDotted:
-      ts << "dotted";
-      break;
-    case EBorderStyle::kDashed:
-      ts << "dashed";
-      break;
-    case EBorderStyle::kSolid:
-      ts << "solid";
-      break;
-    case EBorderStyle::kDouble:
-      ts << "double";
-      break;
-  }
-
-  ts << " ";
+  ts << getValueName(PlatformEnumToCSSValueID(border_style)) << " ";
 }
 
 static String GetTagName(Node* n) {