Refactor ViewsDelegate and MD-ify the icon-to-text spacing for checkbox and radiobutton

ui/views/views_delegate.cc

Index: ui/views/views_delegate.cc
diff --git a/ui/views/views_delegate.cc b/ui/views/views_delegate.cc
index 8a78a96dedebbfa88229cb5d34284fd31393e216..a9e138ce064185e5796528644fbeb13d5b0f8b89 100644
--- a/ui/views/views_delegate.cc
+++ b/ui/views/views_delegate.cc
@@ -19,6 +19,9 @@ namespace {
 
 ViewsDelegate* views_delegate = nullptr;
 
+// Horizontal spacing between the image of a label button and its text. This
+// affects checkboxes and radiobuttons.
+constexpr int kIconTextSpacing = 5;
 }
 
 ViewsDelegate::~ViewsDelegate() {
@@ -126,42 +129,38 @@ scoped_refptr<base::TaskRunner> ViewsDelegate::GetBlockingPoolTaskRunner() {
   return nullptr;
 }
 
-gfx::Insets ViewsDelegate::GetDialogButtonInsets() const {
-  return gfx::Insets(0, kButtonHEdgeMarginNew, kButtonVEdgeMarginNew,
-                     kButtonHEdgeMarginNew);
-}
-
-int ViewsDelegate::GetDialogCloseButtonMargin() const {
-  return kCloseButtonMargin;
-}
-
-int ViewsDelegate::GetDialogRelatedButtonHorizontalSpacing() const {
-  return kRelatedButtonHSpacing;
-}
-
-int ViewsDelegate::GetDialogRelatedControlVerticalSpacing() const {
-  return kRelatedControlVerticalSpacing;
-}
-
-gfx::Insets ViewsDelegate::GetDialogFrameViewInsets() const {
-  return gfx::Insets(kPanelVertMargin, kButtonHEdgeMarginNew, 0,
-                     kButtonHEdgeMarginNew);
-}
-
-gfx::Insets ViewsDelegate::GetBubbleDialogMargins() const {
-  return gfx::Insets(kPanelVertMargin, kPanelHorizMargin);
-}
-
-int ViewsDelegate::GetButtonMinimumWidth() const {
-  return kMinimumButtonWidth;
-}
-
-int ViewsDelegate::GetDialogButtonMinimumWidth() const {
-  return kDialogMinimumButtonWidth;
-}
-
-int ViewsDelegate::GetButtonHorizontalPadding() const {
-  return kButtonHorizontalPadding;
+gfx::Insets ViewsDelegate::GetInsetsMetric(InsetsMetric metric) const {
+  switch (metric) {
+    case InsetsMetric::DIALOG_BUTTON:
+      return gfx::Insets(0, kButtonHEdgeMarginNew, kButtonVEdgeMarginNew,
+                         kButtonHEdgeMarginNew);
+    case InsetsMetric::DIALOG_FRAME_VIEW:
+      return gfx::Insets(kPanelVertMargin, kButtonHEdgeMarginNew, 0,
+                         kButtonHEdgeMarginNew);
+    case InsetsMetric::BUBBLE_DIALOG:
+      return gfx::Insets(kPanelVertMargin, kPanelHorizMargin);
+  }
+  NOTREACHED();
+  return gfx::Insets();
+}
+
+int ViewsDelegate::GetSpacingMetric(SpacingMetric metric) const {
+  switch (metric) {
+    case SpacingMetric::CLOSE_BUTTON_MARGIN:
+      return kCloseButtonMargin;
+    case SpacingMetric::ICON_TO_TEXT:
+      return kIconTextSpacing;
+    case SpacingMetric::RELATED_HORIZONTAL_BUTTON:
+      return kRelatedButtonHSpacing;
+    case SpacingMetric::RELATED_VERTICAL_CONTROL:
+      return kRelatedControlVerticalSpacing;
+    case SpacingMetric::DIALOG_BUTTON_MINIMUM_WIDTH:
+      return kDialogMinimumButtonWidth;
+    case SpacingMetric::BUTTON_HORIZONTAL_PADDING:
+      return kButtonHorizontalPadding;
+  }
+  NOTREACHED();
+  return 0;
 }
 
 ViewsDelegate::ViewsDelegate()