contrib/tweaks/visual/thinner-tabbar-toolbar-bookmarkbar-downloadbar.patch

## This patch makes the tabbar, toolbar, bookmarkbar, and downloadbar thinner.  
#
# These are the values that I'm comfortable with, adjust to your liking.  
#
# Even though the download items are set to 24px, that's really a minimum.  
# Their height is based on the height of two rows of text using your current
# font, so that could vary depending on your settings.  

--- a/chrome/browser/ui/views/download/download_item_view.cc
+++ b/chrome/browser/ui/views/download/download_item_view.cc
@@ -134,7 +134,7 @@
 
 // The vertical distance between the item's visual upper bound (as delineated
 // by the separator on the right) and the edge of the shelf.
-constexpr int kTopBottomPadding = 6;
+constexpr int kTopBottomPadding = 0;
 
 // The minimum vertical padding above and below contents of the download item.
 // This is only used when the text size is large.
@@ -555,7 +555,7 @@
   }
 
   // The normal height of the item which may be exceeded if text is large.
-  constexpr int kDefaultDownloadItemHeight = 48;
+  constexpr int kDefaultDownloadItemHeight = 24;
   return gfx::Size(width, std::max(kDefaultDownloadItemHeight,
                                    2 * kMinimumVerticalPadding + height));
 }
--- a/chrome/browser/ui/layout_constants.cc
+++ b/chrome/browser/ui/layout_constants.cc
@@ -33,13 +33,13 @@
     case BOOKMARK_BAR_HEIGHT:
       // The fixed margin ensures the bookmark buttons appear centered relative
       // to the white space above and below.
-      static constexpr int kBookmarkBarAttachedVerticalMargin = 4;
+      static constexpr int kBookmarkBarAttachedVerticalMargin = 0;
       return GetLayoutConstant(BOOKMARK_BAR_BUTTON_HEIGHT) +
              kBookmarkBarAttachedVerticalMargin;
     case BOOKMARK_BAR_BUTTON_HEIGHT:
-      return touch_ui ? 36 : 28;
+      return touch_ui ? 36 : 24;
     case BOOKMARK_BAR_NTP_HEIGHT:
-      return touch_ui ? GetLayoutConstant(BOOKMARK_BAR_HEIGHT) : 39;
+      return touch_ui ? GetLayoutConstant(BOOKMARK_BAR_HEIGHT) : 27;
     case WEB_APP_MENU_BUTTON_SIZE:
       return 24;
     case WEB_APP_PAGE_ACTION_ICON_SIZE:
@@ -47,18 +47,18 @@
       // stretching the container view.
       return 16;
     case LOCATION_BAR_BUBBLE_FONT_VERTICAL_PADDING:
-      return 2;
+      return 0;
     case LOCATION_BAR_BUBBLE_ANCHOR_VERTICAL_INSET:
       return 1;
     case LOCATION_BAR_CHILD_INTERIOR_PADDING:
-      return 3;
+      return 1;
     case LOCATION_BAR_ELEMENT_PADDING:
       return touch_ui ? 3 : 2;
     case LOCATION_BAR_HEIGHT:
       if (OmniboxFieldTrial::RichAutocompletionShowAdditionalText() &&
           OmniboxFieldTrial::RichAutocompletionTwoLineOmnibox())
         return touch_ui ? 52 : 40;
-      return touch_ui ? 36 : 28;
+      return touch_ui ? 36 : 24;
     case LOCATION_BAR_ICON_SIZE:
       return touch_ui ? 20 : 16;
     case TAB_AFTER_TITLE_PADDING:
@@ -68,7 +68,7 @@
     case TAB_ALERT_INDICATOR_ICON_WIDTH:
       return touch_ui ? 12 : 16;
     case TAB_HEIGHT:
-      return (touch_ui ? 41 : 34) + GetLayoutConstant(TABSTRIP_TOOLBAR_OVERLAP);
+      return (touch_ui ? 41 : 30) + GetLayoutConstant(TABSTRIP_TOOLBAR_OVERLAP);
     case TAB_PRE_TITLE_PADDING:
       return 8;
     case TAB_STACK_DISTANCE:
@@ -76,7 +76,7 @@
     case TABSTRIP_TOOLBAR_OVERLAP:
       return 1;
     case TOOLBAR_BUTTON_HEIGHT:
-      return touch_ui ? 48 : 28;
+      return touch_ui ? 48 : 24;
     case TOOLBAR_ELEMENT_PADDING:
       return touch_ui ? 0 : 4;
     case TOOLBAR_STANDARD_SPACING:
@@ -104,7 +104,7 @@
     }
 
     case TOOLBAR_INTERIOR_MARGIN:
-      return touch_ui ? gfx::Insets() : gfx::Insets(4, 8);
+      return touch_ui ? gfx::Insets() : gfx::Insets(0, 8);
   }
   NOTREACHED();
   return gfx::Insets();