Add source annotations for breakpoints.

runtime/observatory/lib/src/elements/script_inset.html

Index: runtime/observatory/lib/src/elements/script_inset.html
diff --git a/runtime/observatory/lib/src/elements/script_inset.html b/runtime/observatory/lib/src/elements/script_inset.html
index b3f6cd592b23fca37f6304740f6f0aa1ac02d24d..ac2c08c752152675643a2456ebd6d07c2bd839f9 100644
--- a/runtime/observatory/lib/src/elements/script_inset.html
+++ b/runtime/observatory/lib/src/elements/script_inset.html
@@ -39,6 +39,10 @@
       .currentCol {
         background-color: #6cf;
       }
+      .breakAnnotation {
+        background-color: #e66;
+        color: white;
+      }
       .hitsNone, .hitsNotExecuted, .hitsExecuted {
         display: table-cell;
         vertical-align: top;
@@ -49,10 +53,10 @@
         color: #a8a8a8;
       }
       .hitsNotExecuted {
-        background-color: #EEA7A7;
+        background-color: #faa;
       }
       .hitsExecuted {
-        background-color: #9BDD9B;
+        background-color: #aea;
       }
       .noCopy {}
       .emptyBreakpoint, .possibleBreakpoint, .busyBreakpoint, .unresolvedBreakpoint, .resolvedBreakpoint  {