[MD Bookmarks] Support elision of bookmark names in the bookmark toast.

chrome/browser/resources/md_bookmarks/toast_manager.html

Index: chrome/browser/resources/md_bookmarks/toast_manager.html
diff --git a/chrome/browser/resources/md_bookmarks/toast_manager.html b/chrome/browser/resources/md_bookmarks/toast_manager.html
index 44120044e2e0151ac7d26f4f507e8c13f3b79e02..77d4ae274115e446844103188d722253b4d368c3 100644
--- a/chrome/browser/resources/md_bookmarks/toast_manager.html
+++ b/chrome/browser/resources/md_bookmarks/toast_manager.html
@@ -7,6 +7,7 @@
   <template>
     <style include="shared-style">
       #content {
+        display: flex;
         flex: 1;
         margin-right: 32px;
         overflow: hidden;
@@ -23,6 +24,16 @@
         padding: 8px;
       }
 
+      .collapsible {
+        flex: 1;
+        overflow: hidden;
+        text-overflow: ellipsis;
+      }
+
+      span {
+        white-space: pre;
+      }
+
       #toast {
         align-items: center;
         background-color: #323232;