Timeline: add layer tree outline to layer details view

Source/devtools/front_end/layersPanel.css

Index: Source/devtools/front_end/layersPanel.css
diff --git a/Source/devtools/front_end/layersPanel.css b/Source/devtools/front_end/layersPanel.css
deleted file mode 100644
index 3c61809b3164df9805714d87213b3256109775d3..0000000000000000000000000000000000000000
--- a/Source/devtools/front_end/layersPanel.css
+++ /dev/null
@@ -1,55 +0,0 @@
-/*
- * Copyright (C) 2013 Google Inc. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *     * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *     * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- *     * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-.layers.panel .outline-disclosure {
-    z-index: 10;
-}
-
-.layers.panel div.outline-disclosure > ol {
-    margin-left: -12px;
-}
-
-.layers.panel .outline-disclosure ol.children {
-    padding-left: 12px;
-}
-
-.layers.panel .outline-disclosure li {
-    margin-top: 0;
-    margin-bottom: 0;
-    padding: 1 1 1 14px;
-    white-space: nowrap;
-    overflow: hidden;
-    text-overflow: ellipsis;
-}
-
-.layers.panel .outline-disclosure .dimmed {
-    opacity: 0.6;
-}
-