Adds functionality to pack an extension / app from the app.

chrome/browser/resources/apps_debugger/pack_item_overlay.html

Index: chrome/browser/resources/apps_debugger/pack_item_overlay.html
diff --git a/chrome/browser/resources/apps_debugger/pack_item_overlay.html b/chrome/browser/resources/apps_debugger/pack_item_overlay.html
new file mode 100644
index 0000000000000000000000000000000000000000..d000e581ed921539600245e58076fbb1d47c6e7f
--- /dev/null
+++ b/chrome/browser/resources/apps_debugger/pack_item_overlay.html
@@ -0,0 +1,28 @@
+<div id="packItemOverlay" class="page">
+  <h1 i18n-content="packExtensionOverlay"></h1>
+  <div id="cbd-content-area" class="content-area">
+    <div class="pack-item-heading" i18n-content="packExtensionHeading">
+    </div>
+    <div class="pack-item-text-boxes">
+      <label i18n-content="packExtensionRootDir"></label>
+      <input class="pack-item-text-area" id="itemRootDir" type="text">
+      <button id="browseItemDir"
+              i18n-content="packExtensionBrowseButton"></button>
+    </div>
+    <div class="pack-item-text-boxes">
+      <label i18n-content="packExtensionPrivateKey"></label>
+      <input class="pack-item-text-area" id="itemPrivateKey" type="text">
+      <button id="browsePrivateKey"
+              i18n-content="packExtensionBrowseButton"></button>
+    </div>
+  </div>
+  <div class="action-area">
+    <div class="action-area-right">
+      <div class="button-strip">
+        <button id="packItemDismiss" i18n-content="cancel"></button>
+        <button id="packItemCommit"
+                i18n-content="packExtensionCommit"></button>
+      </div>
+    </div>
+  </div>
+</div>