Devtools Animations: Update timeline controls and UI

Source/devtools/front_end/elements/animationTimeline.css

Index: Source/devtools/front_end/elements/animationTimeline.css
diff --git a/Source/devtools/front_end/elements/animationTimeline.css b/Source/devtools/front_end/elements/animationTimeline.css
index 100658bac3f40e9ceb98ca369cd9966a4fc90e1d..5d26646cab8f75aee482ff8877d39d8ea94e0742 100644
--- a/Source/devtools/front_end/elements/animationTimeline.css
+++ b/Source/devtools/front_end/elements/animationTimeline.css
@@ -19,10 +19,12 @@
     position: relative;
     transform-style: preserve-3d;
     line-height: 40px;
-}
-
-.animation-node-row:nth-child(odd) {
-    background-color: hsla(0, 0%, 0%, 0.05);
+    border-bottom: 1px solid hsl(0, 0%, 90%);
+    margin-bottom: -1px;
+    margin-right: 30px;
+    background-color: hsl(0, 0%, 98%);
+    text-overflow: ellipsis;
+    white-space: nowrap;
 }
 
 .animation-timeline-row {
@@ -34,6 +36,10 @@ path.animation-keyframe {
     fill-opacity: 0.3;
 }
 
+.animation-node-selected path.animation-keyframe {
+    fill-opacity: 0.4;
+}
+
 line.animation-line {
     stroke-width: 2px;
     stroke-linecap: round;
@@ -84,12 +90,25 @@ circle.animation-keyframe-point {
     flex-shrink: 0;
 }
 
-.animation-controls {
+.animation-timeline-header:after {
+    content: "";
+    height: 100%;
+    position: absolute;
     width: 200px;
-    max-width: 200px;
+    left: 0;
+    background-color: hsl(0, 0%, 98%);
+    z-index: -1;
+    border-right: 1px solid hsl(0, 0%, 90%);
+}
+
+.animation-controls {
+    width: 201px;
+    max-width: 201px;
     padding: 10px;
     height: 100%;
     line-height: 22px;
+    background-color: hsl(0, 0%, 98%);
+    border-right: 1px solid hsl(0, 0%, 90%);
 }
 
 .animation-timeline-markers {
@@ -106,8 +125,12 @@ circle.animation-keyframe-point {
     width: 100%;
 }
 
+.animation-timeline-end > .animation-time-overlay {
+    visibility: hidden;
+}
+
 input.animation-playback-slider {
-    width: 68px;
+    width: 89px;
     margin-left: 12px;
     -webkit-appearance: none;
     position: absolute;
@@ -139,25 +162,39 @@ input[type=range].animation-playback-slider::-webkit-slider-thumb {
 }
 
 .animation-playback-label {
-    width: 34px;
-    text-align: right;
-    font-family: 'DejaVu Sans';
     display: inline-block;
+    width: 40px;
+    height: 22px;
+    overflow: hidden;
+    text-align: center;
+    border: 1px solid #dadada;
+    border-radius: 2px;
+    line-height: 20px;
+    font-size: 11px;
+    padding: 0;
+    -webkit-user-modify: read-write-plaintext-only;
+    color: #333;
+    white-space: nowrap;
+    overflow: hidden;
 }
 
 .animation-scrubber {
     opacity: 1;
     position: absolute;
-    left: 200px;
+    left: 230px;
     height: calc(100% - 43px);
     width: calc(100% - 200px);
     top: 43px;
     border-left: 1px solid rgba(0,0,0,0.5);
 }
 
+.animation-scrubber.animation-timeline-end {
+    border: none;
+}
+
 .animation-scrubber-head {
-    background-color: rgba(0, 0, 0, 0.5);
-    width: 50px;
+    background-color: rgba(0, 0, 0, 0.7);
+    width: 60px;
     height: 23px;
     color: white;
     line-height: 23px;
@@ -165,11 +202,26 @@ input[type=range].animation-playback-slider::-webkit-slider-thumb {
     border-radius: 5px;
     position: relative;
     top: -29px;
-    left: -26px;
+    left: -30px;
     font-size: 10px;
     visibility: visible;
 }
 
+.animation-scrubber-head:before, .animation-scrubber-head:after {
+    content: "||";
+    position: absolute;
+    color: #999;
+    font-size: 8px;
+}
+
+.animation-scrubber-head:before {
+    left: 3px;
+}
+
+.animation-scrubber-head:after {
+    right: 3px;
+}
+
 .animation-timeline-capturing > .animation-scrubber-head {
     visibility: hidden;
 }
@@ -190,7 +242,7 @@ input[type=range].animation-playback-slider::-webkit-slider-thumb {
     top: -6px;
     left: -7px;
     -webkit-clip-path: polygon(0 0, 6px 6px, 12px 0px, 0px 0px);
-    background-color: rgba(0, 0, 0, 0.5);
+    background-color: rgba(0, 0, 0, 0.7);
 }
 
 .animation-timeline-timer {
@@ -248,15 +300,11 @@ input[type=range].animation-playback-slider::-webkit-slider-thumb {
 
 svg.animation-timeline-grid {
     position: absolute;
-    left: 200px;
+    left: 230px;
 }
 
 rect.animation-timeline-grid-line {
-    fill: #eee;
-}
-
-rect.animation-timeline-grid-line:first-child {
-    fill: #ccc;
+    fill: hsl(0, 0%, 90%);
 }
 
 .animation-timeline-row > svg.animation-ui {
@@ -313,5 +361,22 @@ text.animation-timeline-grid-label {
 }
 
 .animation-node-row.animation-node-selected {
-    background-color: hsla(218, 78%, 66%, 0.1);
+    background-color: hsla(216, 71%, 53%, 0.08);
+}
+
+.animation-node-selected > .animation-node-description {
+    background-color: #EFF4FD;
+}
+
+.animation-timeline-empty-message {
+    padding-left: 230px;
+    padding-right: 30px;
+    text-align: center;
+    position: absolute;
+    font-size: 20px;
+    line-height: 32px;
+    align-items: center;   justify-content: center;
+    width: 100%;
+    height: calc(100% - 44px);
+    display: flex;
 }