bluetooth: Add notification system to internals page.

chrome/browser/resources/bluetooth_internals/bluetooth_internals.css

Index: chrome/browser/resources/bluetooth_internals/bluetooth_internals.css
diff --git a/chrome/browser/resources/bluetooth_internals/bluetooth_internals.css b/chrome/browser/resources/bluetooth_internals/bluetooth_internals.css
index b33ee950239a13b9d5f9ec8226ea3ddc89a26896..b71954eda2059db1d69aee5c429c78c74075e926 100644
--- a/chrome/browser/resources/bluetooth_internals/bluetooth_internals.css
+++ b/chrome/browser/resources/bluetooth_internals/bluetooth_internals.css
@@ -4,6 +4,7 @@
  */
 
 :root {
+  --fade-duration: 225ms;
   --md-timing-function: cubic-bezier(.4, 0, .6, 1);
   --sidebar-width: 155px;
   --sidebar-neg-width: calc(var(--sidebar-width) * -1);
@@ -137,7 +138,6 @@ h1 {
 }
 
 .overlay {
-  --fade-duration: 225ms;
   background-color: rgba(0, 0, 0, .5);
   bottom: 0;
   left: 0;
@@ -206,3 +206,66 @@ table .removed {
     font-weight: bold;
   }
 }
+
+/** Snackbar */
+.snackbar {
+  background-color: #F0F0F0;
+  border-radius: 2px;
+  bottom: 0;
+  display: flex;
+  font-size: 14pt;
+  justify-content: center;
+  left: 0;
+  margin: 0 auto;
+  max-width: 568px;
+  min-height: 20px;
+  min-width: 288px;
+  padding: 14px 24px;
+  position: fixed;
+  right: 0;
+  transform: translate3d(0, 48px, 0);
+  transition: transform var(--fade-duration), visibility var(--fade-duration);
+  transition-timing-function: var(--md-timing-function);
+  visibility: hidden;
+}
+
+.snackbar a {
+  -webkit-margin-start: auto;
+  display: flex;
+  flex-direction: column;
+  justify-content: center;
+}
+
+@media screen and (max-width: 600px) {
+  .snackbar {
+    border-radius: 0;
+    max-width: unset;
+    min-width: unset;
+  }
+}
+
+.snackbar div {
+  align-self: flex-start;
+  color: white;
+}
+
+.snackbar.info div {
+  color: black;
+}
+
+.snackbar.success {
+  background-color: rgb(76, 175, 80);
+}
+
+.snackbar.warning {
+  background-color: rgb(255, 152, 0);
+}
+
+.snackbar.danger {
+  background-color: rgb(244, 67, 54);
+}
+
+.snackbar.open {
+  transform: translate3d(0, 0, 0);
+  visibility: visible;
+}