Fix sourceURL & sourceMapURL handling in case of background parsing

BUG=

Review URL: https://codereview.chromium.org/821723002

Cr-Commit-Position: refs/heads/master@{#25980}

src/api.cc

@@ -1780,6 +1780,7 @@ Local<Script> ScriptCompiler::Compile(Isolate* v8_isolate,
     // Do the parsing tasks which need to be done on the main thread. This will
     // also handle parse errors.
     source->parser->Internalize();
+    source->parser->HandleSourceURLComments();
 
     i::Handle<i::SharedFunctionInfo> result =
         i::Handle<i::SharedFunctionInfo>::null();

src/parser.h

@@ -682,6 +682,7 @@ class Parser : public ParserBase<ParserTraits> {
   // Handle errors detected during parsing, move statistics to Isolate,
   // internalize strings (move them to the heap).
   void Internalize();
+  void HandleSourceURLComments();
 
  private:
   friend class ParserTraits;
@@ -879,8 +880,6 @@ class Parser : public ParserBase<ParserTraits> {
       const AstRawString* function_name, int pos, Variable* fvar,
       Token::Value fvar_init_op, bool is_generator, bool* ok);
 
-  void HandleSourceURLComments();
-
   void ThrowPendingError();
 
   TemplateLiteralState OpenTemplateLiteral(int pos);

test/cctest/test-api.cc

@@ -23999,10 +23999,8 @@ TEST(ScriptNameAndLineNumber) {
   CHECK_EQ(13, line_number);
 }
 
-
-void SourceURLHelper(const char* source, const char* expected_source_url,
-                     const char* expected_source_mapping_url) {
-  Local<Script> script = v8_compile(source);
+void CheckMagicComments(Handle<Script> script, const char* expected_source_url,
+                        const char* expected_source_mapping_url) {
   if (expected_source_url != NULL) {
     v8::String::Utf8Value url(script->GetUnboundScript()->GetSourceURL());
     CHECK_EQ(expected_source_url, *url);
@@ -24018,6 +24016,12 @@ void SourceURLHelper(const char* source, const char* expected_source_url,
   }
 }
 
+void SourceURLHelper(const char* source, const char* expected_source_url,
+                     const char* expected_source_mapping_url) {
+  Local<Script> script = v8_compile(source);
+  CheckMagicComments(script, expected_source_url, expected_source_mapping_url);
+}
+
 
 TEST(ScriptSourceURLAndSourceMappingURL) {
   LocalContext env;
@@ -24209,7 +24213,9 @@ class TestSourceStream : public v8::ScriptCompiler::ExternalSourceStream {
 void RunStreamingTest(const char** chunks,
                       v8::ScriptCompiler::StreamedSource::Encoding encoding =
                           v8::ScriptCompiler::StreamedSource::ONE_BYTE,
-                      bool expected_success = true) {
+                      bool expected_success = true,
+                      const char* expected_source_url = NULL,
+                      const char* expected_source_mapping_url = NULL) {
   LocalContext env;
   v8::Isolate* isolate = env->GetIsolate();
   v8::HandleScope scope(isolate);
@@ -24238,6 +24244,8 @@ void RunStreamingTest(const char** chunks,
     v8::Handle<Value> result(script->Run());
     // All scripts are supposed to return the fixed value 13 when ran.
     CHECK_EQ(13, result->Int32Value());
+    CheckMagicComments(script, expected_source_url,
+                       expected_source_mapping_url);
   } else {
     CHECK(script.IsEmpty());
     CHECK(try_catch.HasCaught());
@@ -24727,3 +24735,27 @@ TEST(ClassPrototypeCreationContext) {
       CompileRun("'use strict'; class Example { }; Example.prototype"));
   CHECK(env.local() == result->CreationContext());
 }
+
+
+TEST(SimpleStreamingScriptWithSourceURL) {
+  const char* chunks[] = {"function foo() { ret", "urn 13; } f", "oo();\n",
+                          "//# sourceURL=bar2.js\n", NULL};
+  RunStreamingTest(chunks, v8::ScriptCompiler::StreamedSource::UTF8, true,
+                   "bar2.js");
+}
+
+
+TEST(StreamingScriptWithSplitSourceURL) {
+  const char* chunks[] = {"function foo() { ret", "urn 13; } f",
+                          "oo();\n//# sourceURL=b", "ar2.js\n", NULL};
+  RunStreamingTest(chunks, v8::ScriptCompiler::StreamedSource::UTF8, true,
+                   "bar2.js");
+}
+
+
+TEST(StreamingScriptWithSourceMappingURLInTheMiddle) {
+  const char* chunks[] = {"function foo() { ret", "urn 13; }\n//#",
+                          " sourceMappingURL=bar2.js\n", "foo();", NULL};
+  RunStreamingTest(chunks, v8::ScriptCompiler::StreamedSource::UTF8, true, NULL,
+                   "bar2.js");
+}