DevTools: Introduce Landing page for Timeline panel.

third_party/WebKit/Source/devtools/front_end/timeline/timelineLandingPage.css

Index: third_party/WebKit/Source/devtools/front_end/timeline/timelineLandingPage.css
diff --git a/third_party/WebKit/Source/devtools/front_end/timeline/timelineLandingPage.css b/third_party/WebKit/Source/devtools/front_end/timeline/timelineLandingPage.css
new file mode 100644
index 0000000000000000000000000000000000000000..d6a652f1f7cc1cd79f36be7a8c8c7f1223dc8b18
--- /dev/null
+++ b/third_party/WebKit/Source/devtools/front_end/timeline/timelineLandingPage.css
@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2016 The Chromium Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+.timeline-landing-page {
+    align-self: center;
+    max-width: 500px;
+    font-size: 13px;
+}
+
+.timeline-landing-page .tabbed-pane {
+    padding: 10px 0 0 0;
+}
+
+.timeline-landing-page .timeline-perspective-body {
+    align-items: stretch;
+    line-height: 1.5;
+    padding: 12px;
+    white-space: pre-line;
+    width: 100%;
+    font-size: 12px;
+}
+
+.timeline-landing-page .timeline-perspective-body > div {
+    margin-bottom: 12px;
+    flex-shrink: 0;
+}
+
+.timeline-landing-page button {
+    min-width: 90px;
+    min-height: 26px;
+    margin: 10px 0 0 0;
+}
+
+.timeline-landing-page .recording-setting {
+    display: flex;
+    align-items: flex-start;
+    margin-bottom: 2px !important;
+}
+
+.timeline-landing-page .recording-setting label {
+    flex: 0 0 100px;
+}
+
+.timeline-landing-page .recording-setting-description {
+    color: #999;
+}