Broke out layout metric information from ViewsDelegate to LayoutProvider

ui/views/layout/layout_delegate.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/layout/layout_delegate.h"
+
+#include "base/logging.h"
+#include "base/memory/ptr_util.h"
+#include "ui/base/material_design/material_design_controller.h"
+#include "ui/views/layout/layout_constants.h"
+#include "ui/views/views_delegate.h"
+
+namespace views {
+
+namespace {
+static LayoutDelegate* g_layout_delegate = nullptr;
+static DefaultTypographyProvider g_typography_provider;
+}
+
+LayoutDelegate::LayoutDelegate() {
+  g_layout_delegate = this;
+}
+
+LayoutDelegate::~LayoutDelegate() {
+  if (this == g_layout_delegate)
+    g_layout_delegate = nullptr;
+}
+
+// static
+LayoutDelegate* LayoutDelegate::Get() {
+  return g_layout_delegate;
+}
+
+gfx::Insets LayoutDelegate::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);
+    case InsetsMetric::PANEL:
+      return gfx::Insets(kPanelVertMargin, kButtonHEdgeMarginNew);
+    case InsetsMetric::VECTOR_IMAGE_BUTTON:
+      return gfx::Insets(kVectorButtonExtraTouchSize);
+  }
+  NOTREACHED();
+  return gfx::Insets();
+}
+
+int LayoutDelegate::GetDistanceMetric(DistanceMetric metric) const {
+  switch (metric) {
+    case DistanceMetric::CLOSE_BUTTON_MARGIN:
+      return kCloseButtonMargin;
+    case DistanceMetric::RELATED_BUTTON_HORIZONTAL:
+      return kRelatedButtonHSpacing;
+    case DistanceMetric::RELATED_CONTROL_HORIZONTAL:
+      return kRelatedControlHorizontalSpacing;
+    case DistanceMetric::RELATED_CONTROL_VERTICAL:
+      return kRelatedControlVerticalSpacing;
+    case DistanceMetric::DIALOG_BUTTON_MINIMUM_WIDTH:
+      return kDialogMinimumButtonWidth;
+    case DistanceMetric::BUTTON_HORIZONTAL_PADDING:
+      return kButtonHorizontalPadding;
+  }
+  NOTREACHED();
+  return 0;
+}
+
+const TypographyProvider& LayoutDelegate::GetTypographyProvider() const {
+  return g_typography_provider;
+}
+
+}  // namespace views