Increase minimum width of tab on touchable chrome

This patch increases the minimum width of the tab from 68px to 160 px.

Bug: 826380
Change-Id: I3aa3e96b09784bec3ed4e6b647f57785e7bac128
Component: Tabs, layout constant
Reviewed-on: https://chromium-review.googlesource.com/1044495
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#556116}

chrome/browser/ui/layout_constants.cc

@@ -83,7 +83,7 @@ int GetLayoutConstant(LayoutConstant constant) {
     case TAB_STACK_DISTANCE:
       return touch_optimized_material ? 4 : 6;
     case TAB_STACK_TAB_WIDTH:
-      return touch_optimized_material ? 68 : 120;
+      return touch_optimized_material ? 160 : 120;
     case TAB_STANDARD_WIDTH:
       return touch_optimized_material ? 245 : 193;
     case TOOLBAR_ELEMENT_PADDING: {