Rework error handling in the service protocol and in Observatory.

runtime/observatory/lib/src/elements/css/shared.css

 /* Global styles */
 * {
   margin: 0;
   padding: 0;
   font: 400 14px 'Montserrat', sans-serif;
   color: #333;
   box-sizing: border-box;
 }
 
 .content {
@@ skipping 99 matching lines @@
   border-bottom-right-radius: 4px;
   border-bottom-left-radius:4px;
 }
 
 /* Flex row container */
 .flex-row {
   display: flex;
   flex-direction: row;
 }
 
+.flex-row-wrap {
+  display: flex;
+  flex-direction: row;
+  flex-wrap: wrap;
+}
+
 .inline-flex-row {
   display: inline-flex;
   flex-direction: row;
 }
 
 /* Flex column container */
 .flex-column {
   display: flex;
   flex-direction: column;
 }
@@ skipping 201 matching lines @@
     -webkit-transform: translate3d(10px, 0, 0);
     -ms-transform: translate3d(10px, 0, 0);
     transform: translate3d(10px, 0, 0);
   }
 }
 
 .shake {
   animation: shake 0.5s;
   -webkit-animation: shake 0.5s;
 }