[MD Bookmarks] Add skeleton for MD Bookmarks.

chrome/browser/resources/md_bookmarks/shared_style.html

Index: chrome/browser/resources/md_bookmarks/shared_style.html
diff --git a/chrome/browser/resources/md_bookmarks/shared_style.html b/chrome/browser/resources/md_bookmarks/shared_style.html
new file mode 100644
index 0000000000000000000000000000000000000000..ea3eb829c34228e672ccc3364fcc5751246ca32b
--- /dev/null
+++ b/chrome/browser/resources/md_bookmarks/shared_style.html
@@ -0,0 +1,42 @@
+<link rel="import" href="chrome://bookmarks/shared_vars.html">
+<dom-module id="shared-style">

[tsergeant, 2016/12/22 04:33:01]

Nit: newline before this.

[angelayang, 2016/12/28 00:49:38]

Done.

+  <template>
+    <style>
+      [hidden] {
+        display: none !important;
+      }
+
+      button.more-vert-button {
+        height: 36px;
+        padding: 8px;
+        width: 36px;
+      }
+
+      button.more-vert-button div {
+        border: 2px solid var(--secondary-text-color);
+        border-radius: 2px;
+        margin: 1px 8px;
+        pointer-events: none;
+        transform: scale(0.8);
+      }
+
+      .dropdown-item {

[tsergeant, 2016/12/22 04:33:01]

As of this morning, these styles are no longer necessary. cr-action-menu handles
them itself, so you can just delete this block (you might have to rebase from
origin first, though?)

[angelayang, 2016/12/28 00:49:38]

Done.

+        background: none;
+        border: none;
+        cursor: pointer;
+        display: flex;
+        font: inherit;
+        min-height: 32px;
+        padding: 8px 24px;
+        width: 100%;
+      }
+
+      hr {
+        background: rgba(0, 0, 0, 0.11);
+        border-width: 0;
+        height: 1px;
+        margin: 8px 0;
+      }
+    </style>
+  </template>
+</dom-module>