Parametrize a variety of constants in preparation for changing them in MD.

chrome/browser/ui/views/layout_constants.h

Index: chrome/browser/ui/views/layout_constants.h
diff --git a/chrome/browser/ui/views/layout_constants.h b/chrome/browser/ui/views/layout_constants.h
index a23bf0a47797d1e38d1a418d5c734c8beb8d1d6f..49032246741f19bab0676a78a0bea4d64a0cc551 100644
--- a/chrome/browser/ui/views/layout_constants.h
+++ b/chrome/browser/ui/views/layout_constants.h
@@ -37,6 +37,29 @@ enum LayoutConstant {
   // The font size to use in the location bar and omnibox dropdown, in pixels.
   OMNIBOX_FONT_PIXEL_SIZE,
 
+  // The amount of overlap between two adjacent tabs.
+  TABSTRIP_TAB_OVERLAP,
+
+  // The vertical overlap of the tabstrip atop the toolbar.
+  TABSTRIP_TOOLBAR_OVERLAP,
+
+  // The height of the shadow region above the top of the tabs.
+  TABSTRIP_TOP_SHADOW_HEIGHT,
+
+  // The amount by which the tab close button should overlap the trailing
+  // padding region after the tab's contents region.
+  TAB_CLOSE_BUTTON_TRAILING_PADDING_OVERLAP,
+
+  // The horizontal space between a tab's favicon and its title.
+  TAB_FAVICON_TITLE_SPACING,
+
+  // The maximum width we'll allow for a tab's title, when the tabstrip is wide
+  // enough for tabs to take as much space as they want.
+  TAB_MAXIMUM_TITLE_WIDTH,
+
+  // Width available for content inside a pinned tab.
+  TAB_PINNED_CONTENT_WIDTH,
+
   // Non-ash uses a rounded content area with no shadow in the assets.
   // Ash doesn't use a rounded content area and its top edge has an extra
   // shadow.
@@ -62,6 +85,9 @@ enum LayoutInset {
   // row edge.
   OMNIBOX_DROPDOWN_TEXT,
 
+  // The padding inside the tab bounds that defines the tab contents region.
+  TAB,
+
   // The spacing between a ToolbarButton's image and its border.
   TOOLBAR_BUTTON,