DevTools: Add closure compile to buildbot to type check devtools front-end

third_party/WebKit/Source/devtools/BUILD.gn

Index: third_party/WebKit/Source/devtools/BUILD.gn
diff --git a/third_party/WebKit/Source/devtools/BUILD.gn b/third_party/WebKit/Source/devtools/BUILD.gn
index 0cba489c0580beb7eb30cbc6d24da931136bfe7e..31e98f157f1605a3ca104fd6ea284be2ed586343 100644
--- a/third_party/WebKit/Source/devtools/BUILD.gn
+++ b/third_party/WebKit/Source/devtools/BUILD.gn
@@ -1156,3 +1156,19 @@ if (debug_devtools) {
     ]
   }
 }
+
+group("devtools_closure_compile") {
+  data = [
+    # Needed for isolate script to execute.
+    "front_end/",
+    "scripts/build/",
+    "scripts/closure/",
+    "scripts/compile_frontend.py",
+    "scripts/jsdoc_validator/",
+    "//testing/scripts/run_devtools_closure_compile.py",
+    "//testing/scripts/common.py",
+    "//testing/xvfb.py",
+    "//third_party/WebKit/Source/core/inspector/browser_protocol.json",
+    "//v8/src/inspector/js_protocol.json",
+  ]
+}