Add fuzzer-collapse-function-sk and demo

fuzzer/res/imp/fuzzer-collapse-details-sk.html

 <!--
   The common.js file must be included before this file.
 
   This in an HTML Import-able file that contains the definition
   of the following elements:
 
     <fuzzer-collapse-details-sk>
 
   To use this file import it:
 
     <link href="/res/imp/fuzzer-collapse-details-sk.html" rel="import" />
 
   Usage:
 
     <fuzzer-collapse-details-sk></fuzzer-collapse-details-sk>
 
   Properties:
     details - The details object.  Expected to have the following attributes:
       lineNumber: Number,
       apiCount: Number,
       binaryCount: Number,
-      binaryReports: [optional] Array of Reports. If supplied,
+      binaryReports: Array of Reports. If non-empty,
         an expandable details panel will be created containing representations of the reports.
-        If omitted, just the summary will be shown.
+        If empty, just the summary will be shown.
         Reports are objects and have the following attributes:
         - binaryName: String, The name of the binary, likely an md5 hash
         - binaryType: String, The type of the binary
         - flags: Array of String, The flags associated with the run (e.g. DebugDumped)
         - debugStackTrace: Object (see fuzzer-stacktrace-sk.html for schema)
         - releaseStackTrace: Object (see fuzzer-stacktrace-sk.html for schema)
 
   Methods:
     setDetails(details) - Programmatically set the details object.
     showMore() - Programmatically show up to 6 more details panels.
@@ skipping 212 matching lines @@
       return "/dump/" + type + "/" + report.binaryName;
     },
 
     toggleDetails: function() {
       this.$$("#detailsPanel").toggle();
       this.$$("#indicator").toggleClass("toggled");
     }
   });
   </script>
 </dom-module>