Add new blink_perf benchmark to test-info.json

tools/perf/test-info.json

 {
   "_description": "This file contains info about our performance test suites, used by the perf dashboard (http://chromeperf.appspot.com).",
+  "blink_perf": {
+    "description": "Runs all enabled benchmarks in third_party/WebKit/PerformanceTests/",
+    "code": [
+      "chrome/src/tools/perf/perf_tools/blink_perf.py",
+      "third_party/WebKit/PerformanceTests/"
+    ]
+  },
   "bloat": {
     "description": "Load an image many times and ensure memory usage stays low.",
     "code": [
       "chrome/src/tools/perf/page_sets/page_cycler/bloat.json",
       "chrome/src/tools/perf/perf_tools/page_cycler.py"
     ]
   },
   "cc_perftests": {
     "description": "Microbenchmarks for compositor (cc/) component.",
     "code": [
@@ skipping 241 matching lines @@
     "code": ["chrome/src/tools/perf/perf_tools/sunspider.py"]
   },
   "typical_25": {
     "description": "Page load time benchmark for a 25 typical web pages. Designed to represent typical, not highly optimized or highly popular web sites. Runs against pages recorded in April, 2013.",
     "code": [
       "chrome/src/tools/perf/perf_tools/page_cycler.py",
       "chrome/src/tools/perf/page_sets/typical_25.json"
     ]
   }
 }