[CCA] Tune camera folder announcement motion

This CL follows the spec mentioned in crbug.com/1133088.

Bug: 1133088
Test: Manually
Change-Id: I143bbf67ebec4c2757fffb4db9b2ab1b3d856e70
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2437995Reviewed-by: Inker Kuo <inker@chromium.org>
Commit-Queue: Inker Kuo <inker@chromium.org>
Commit-Queue: Wei Lee <wtlee@chromium.org>
Auto-Submit: Wei Lee <wtlee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812063}

chromeos/components/camera_app_ui/resources/css/main.css

@@ -1125,7 +1125,7 @@ body:not(.recording-ui-paused) #record-time [i18n-content=record_video_paused_ms
 }
 
 #banner.animate {
-  animation: emerge 12000ms ease-out;
+  animation: emerge 12000ms cubic-bezier(0.0, 0.0, 0.2, 1);
   display: block;
 }
 
@@ -1134,8 +1134,9 @@ body:not(.recording-ui-paused) #record-time [i18n-content=record_video_paused_ms
   100% {
     bottom: -130;
   }
-  10%,
-  90% {
+  4%,
+  96% {
+    animation-timing-function: cubic-bezier(0.4, 0.0, 1.0, 1.0);
     bottom: 31px;
   }
 }