Add pause/resume for isolates in vmservice/observatory.

runtime/bin/vmservice/client/lib/src/elements/css/shared.css

Index: runtime/bin/vmservice/client/lib/src/elements/css/shared.css
diff --git a/runtime/bin/vmservice/client/lib/src/elements/css/shared.css b/runtime/bin/vmservice/client/lib/src/elements/css/shared.css
index 3245eb2abe67aa2ea4a16f76a5463b3fd92765c5..06f2c11492d4e3a52cdd404f35e6bf266243ab60 100644
--- a/runtime/bin/vmservice/client/lib/src/elements/css/shared.css
+++ b/runtime/bin/vmservice/client/lib/src/elements/css/shared.css
@@ -142,7 +142,7 @@ hr {
   flex-basis: 33.3333%;
 }
 
-.flex-item-fixed-6-12 {
+.flex-item-fixed-6-12, .flex-item-50-percent {
   flex-grow: 0;
   flex-shrink: 0;
   flex-basis: 50%;
@@ -167,6 +167,54 @@ hr {
   flex-basis: 100%;
 }
 
+.flex-item-10-percent {
+  flex-grow: 0;
+  flex-shrink: 0;
+  flex-basis: 10%;
+}
+
+.flex-item-15-percent {
+  flex-grow: 0;
+  flex-shrink: 0;
+  flex-basis: 15%;
+}
+
+.flex-item-20-percent {
+  flex-grow: 0;
+  flex-shrink: 0;
+  flex-basis: 20%;
+}
+
+.flex-item-30-percent {
+  flex-grow: 0;
+  flex-shrink: 0;
+  flex-basis: 30%;
+}
+
+.flex-item-40-percent {
+  flex-grow: 0;
+  flex-shrink: 0;
+  flex-basis: 40%;
+}
+
+.flex-item-60-percent {
+  flex-grow: 0;
+  flex-shrink: 0;
+  flex-basis: 60%;
+}
+
+.flex-item-70-percent {
+  flex-grow: 0;
+  flex-shrink: 0;
+  flex-basis: 70%;
+}
+
+.flex-item-80-percent {
+  flex-grow: 0;
+  flex-shrink: 0;
+  flex-basis: 80%;
+}
+
 .well {
   min-height: 20px;
   padding: 19px;