"Bootstrap" a toolkit-views Typography spec.

ui/views/style/typography_provider.cc

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ui/views/style/typography_provider.h"
+
+#include "base/logging.h"
+#include "ui/base/default_style.h"
+#include "ui/base/resource/resource_bundle.h"
+#include "ui/views/style/typography.h"
+
+namespace views {
+namespace {
+std::unique_ptr<TypographyProvider>& Storage() {
+  CR_DEFINE_STATIC_LOCAL(std::unique_ptr<TypographyProvider>, storage,
+                         (new DefaultTypographyProvider));
+  return storage;
+}
+}  // namespace
+
+// static
+void TypographyProvider::Set(std::unique_ptr<TypographyProvider> provider) {
+  DCHECK(provider);
+  Storage() = std::move(provider);
+}
+
+// static
+const TypographyProvider& TypographyProvider::Get() {
+  return *Storage().get();
+}
+
+const gfx::FontList& DefaultTypographyProvider::GetFont(TextContext context,
+                                                        TextStyle style) const {
+  int size_delta;
+  gfx::Font::Weight font_weight;
+  GetDefaultFont(context, style, &size_delta, &font_weight);
+  constexpr gfx::Font::FontStyle kFontStyle = gfx::Font::NORMAL;
+  return ResourceBundle::GetSharedInstance().GetFontListWithDelta(
+      size_delta, kFontStyle, font_weight);
+}
+
+void DefaultTypographyProvider::GetDefaultFont(
+    TextContext context,
+    TextStyle style,
+    int* size_delta,
+    gfx::Font::Weight* font_weight) const {
+  switch (context.value()) {
+    case TextContext::DIALOG_TITLE:
+      *size_delta = ui::kTitleFontSizeDelta;
+      break;
+    default:
+      *size_delta = ui::kLabelFontSizeDelta;
+      break;
+  }
+
+  switch (style.value()) {
+    case TextStyle::ACTIVE_TAB:
+      *font_weight = gfx::Font::Weight::BOLD;
+      break;
+    default:
+      *font_weight = gfx::Font::Weight::NORMAL;
+      break;
+  }
+}
+
+SkColor DefaultTypographyProvider::GetColor(TextContext context,
+                                            TextStyle style) const {
+  return SK_ColorBLACK;
+}
+
+int DefaultTypographyProvider::GetLineSpacing(TextContext context,
+                                              TextStyle style) const {
+  return 0;
+}
+
+}  // namespace views