MD History: Improve styling of grouped history toolbar during page load

chrome/browser/resources/md_history/lazy_load.vulcanized.html

Index: chrome/browser/resources/md_history/lazy_load.vulcanized.html
diff --git a/chrome/browser/resources/md_history/lazy_load.vulcanized.html b/chrome/browser/resources/md_history/lazy_load.vulcanized.html
index d804ed4792247034e969742a2b91a69ac2182747..a35ac98cf73ddb8b1e75eee6e7c604c7de5321e8 100644
--- a/chrome/browser/resources/md_history/lazy_load.vulcanized.html
+++ b/chrome/browser/resources/md_history/lazy_load.vulcanized.html
@@ -97,6 +97,7 @@ a {
 button.icon-button {
   background: none;
         border: none;
+        color: inherit;
         height: 36px;
         outline: none;
         width: 36px;
@@ -472,6 +473,7 @@ a {
 button.icon-button {
   background: none;
         border: none;
+        color: inherit;
         height: 36px;
         outline: none;
         width: 36px;
@@ -655,6 +657,7 @@ a {
 button.icon-button {
   background: none;
         border: none;
+        color: inherit;
         height: 36px;
         outline: none;
         width: 36px;
@@ -863,6 +866,8 @@ paper-icon-button.subpage-arrow {
   border: 0;
         border-radius: 2px;
         bottom: 0;
+        box-shadow: 0px 0px 16px rgba(0, 0, 0, 0.12),
+                    0px 16px 16px rgba(0, 0, 0, 0.24);
         color: inherit;
         padding: 0;
         top: 0;