Parser: add usage counters for "use asm".

test/cctest/test-parsing.cc

Index: test/cctest/test-parsing.cc
diff --git a/test/cctest/test-parsing.cc b/test/cctest/test-parsing.cc
index b36621742ae2824c01b72a538145b6263d184c8c..32c515cc89899c17068cf28257610caa7d5a9b7a 100644
--- a/test/cctest/test-parsing.cc
+++ b/test/cctest/test-parsing.cc
@@ -2745,3 +2745,29 @@ TEST(InnerAssignment) {
     }
   }
 }
+
+namespace {
+
+int* global_use_counts = NULL;
+
+void MockUseCounterCallback(v8::Isolate* isolate,
+                            v8::Isolate::UseCounterFeature feature) {
+  ++global_use_counts[feature];
+}
+
+}
+
+
+TEST(UseAsmUseCount) {
+  i::Isolate* isolate = CcTest::i_isolate();
+  i::HandleScope scope(isolate);
+  LocalContext env;
+  int use_counts[v8::Isolate::kUseCounterFeatureCount] = {};
+  global_use_counts = use_counts;
+  CcTest::isolate()->SetUseCounterCallback(MockUseCounterCallback);
+  CompileRun("\"use asm\";\n"
+             "var foo = 1;\n"
+             "\"use asm\";\n"  // Only the first one counts.
+             "function bar() { \"use asm\"; var baz = 1; }");
+  CHECK_EQ(2, use_counts[v8::Isolate::kUseAsm]);
+}