Revert of Removed support deprecated (//@|/*@) source(URL|MappingURL)=...

Revert of Removed support deprecated (//@|/*@) source(URL|MappingURL)= (patchset #1 id:1 of https://codereview.chromium.org/1474543005/ )

Reason for revert:
Failing layout tests:

inspector/tracing/timeline-event-causes.html
virtual/syncpaint/inspector/tracing/timeline-event-causes.html
inspector/animation/animation-timeline-fill.html
virtual/threaded/inspector/tracing/timeline-event-causes.html
inspector/tracing/timeline-script-id.html
inspector/sources/debugger-ui/source-url-comment.html
inspector/console/console-log-linkify-stack-in-errors.html
virtual/syncpaint/inspector/tracing/timeline-script-id.html
virtual/threaded/inspector/tracing/timeline-script-id.html

Original issue's description:
> Removed support deprecated (//@|/*@) source(URL|MappingURL)=
>
> LOG=Y
> BUG=chromium:558998
> R=yangguo@chromium.org
>
> Committed: https://crrev.com/c1e5f005d79c436d90f474f8bc6448c4555a619f
> Cr-Commit-Position: refs/heads/master@{#32249}

TBR=machenbach@chromium.org,kozyatinskiy@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:558998

Review URL: https://codereview.chromium.org/1481513002

Cr-Commit-Position: refs/heads/master@{#32259}

include/v8.h

@@ -1604,7 +1604,8 @@ class V8_EXPORT StackFrame {
   /**
    * Returns the name of the resource that contains the script for the
    * function for this StackFrame or sourceURL value if the script name
-   * is undefined and its source ends with //# sourceURL=... string.
+   * is undefined and its source ends with //# sourceURL=... string or
+   * deprecated //@ sourceURL=... string.
    */
   Local<String> GetScriptNameOrSourceURL() const;
 

src/js/messages.js

@@ -448,10 +448,11 @@ function ScriptLineEnd(n) {
  * If sourceURL comment is available returns sourceURL comment contents.
  * Otherwise, script name is returned. See
  * http://fbug.googlecode.com/svn/branches/firebug1.1/docs/ReleaseNotes_1.1.txt
- * and Source Map Revision 3 proposal for details on using //# sourceURL
- * comment to identify scripts that don't have name.
+ * and Source Map Revision 3 proposal for details on using //# sourceURL and
+ * deprecated //@ sourceURL comment to identify scripts that don't have name.
  *
- * @return {?string} script name if present, value for //# sourceURL comment.
+ * @return {?string} script name if present, value for //# sourceURL or
+ * deprecated //@ sourceURL comment otherwise.
  */
 function ScriptNameOrSourceURL() {
   if (this.source_url) return this.source_url;

src/scanner.cc

@@ -356,7 +356,7 @@ Token::Value Scanner::SkipSourceURLComment() {
 
 
 void Scanner::TryToParseSourceURLComment() {
-  // Magic comments are of the form: //[#]\s<name>=\s*<value>\s*.* and this
+  // Magic comments are of the form: //[#@]\s<name>=\s*<value>\s*.* and this
   // function will just return if it cannot parse a magic comment.
   if (c0_ < 0 || !unicode_cache_->IsWhiteSpace(c0_)) return;
   Advance();
@@ -574,7 +574,7 @@ void Scanner::Scan() {
         Advance();
         if (c0_ == '/') {
           Advance();
-          if (c0_ == '#') {
+          if (c0_ == '@' || c0_ == '#') {
             Advance();
             token = SkipSourceURLComment();
           } else {

test/cctest/test-api.cc

@@ -15321,6 +15321,8 @@ TEST(SourceURLInStackTrace) {
   i::ScopedVector<char> code(1024);
   i::SNPrintF(code, source, "//# sourceURL=eval_url");
   CHECK(CompileRun(code.start())->IsUndefined());
+  i::SNPrintF(code, source, "//@ sourceURL=eval_url");
+  CHECK(CompileRun(code.start())->IsUndefined());
 }
 
 
@@ -15402,6 +15404,8 @@ TEST(InlineScriptWithSourceURLInStackTrace) {
   i::ScopedVector<char> code(1024);
   i::SNPrintF(code, source, "//# sourceURL=source_url");
   CHECK(CompileRunWithOrigin(code.start(), "url", 0, 1)->IsUndefined());
+  i::SNPrintF(code, source, "//@ sourceURL=source_url");
+  CHECK(CompileRunWithOrigin(code.start(), "url", 0, 1)->IsUndefined());
 }
 
 
@@ -15446,6 +15450,8 @@ TEST(DynamicWithSourceURLInStackTrace) {
   i::ScopedVector<char> code(1024);
   i::SNPrintF(code, source, "//# sourceURL=source_url");
   CHECK(CompileRunWithOrigin(code.start(), "url", 0, 0)->IsUndefined());
+  i::SNPrintF(code, source, "//@ sourceURL=source_url");
+  CHECK(CompileRunWithOrigin(code.start(), "url", 0, 0)->IsUndefined());
 }
 
 

test/mjsunit/regress/regress-conditional-position.js

@@ -86,9 +86,9 @@ test(test1, 58);
 test(test2, 65);
 test(test3, 72);
 
-eval(test1.toString() + "//# sourceUrl=foo");
-eval(test2.toString() + "//# sourceUrl=foo");
-eval(test3.toString() + "//# sourceUrl=foo");
+eval(test1.toString() + "//@ sourceUrl=foo");
+eval(test2.toString() + "//@ sourceUrl=foo");
+eval(test3.toString() + "//@ sourceUrl=foo");
 
 test(test1, 2);
 test(test2, 3);

test/mjsunit/regress/regress-crbug-109362.js

@@ -15,20 +15,20 @@ function test(expectation, f) {
 
 /*
 (function() {
-1 + reference_error //# sourceURL=evaltest
+1 + reference_error //@ sourceURL=evaltest
 })
 */
 test("2:5", new Function(
-    '1 + reference_error //# sourceURL=evaltest'));
+    '1 + reference_error //@ sourceURL=evaltest'));
 /*
 (function(x
 /\**\/) {
 
- 1 + reference_error //# sourceURL=evaltest
+ 1 + reference_error //@ sourceURL=evaltest
 })
 */
 test("4:6", new Function(
-    'x', '\n 1 + reference_error //# sourceURL=evaltest'));
+    'x', '\n 1 + reference_error //@ sourceURL=evaltest'));
 /*
 (function(x
 
@@ -36,24 +36,24 @@ test("4:6", new Function(
 ,y
 /\**\/) {
 
- 1 + reference_error //# sourceURL=evaltest
+ 1 + reference_error //@ sourceURL=evaltest
 })
 */
 test("7:6", new Function(
-    'x\n\n', "z//\n", "y", '\n 1 + reference_error //# sourceURL=evaltest'));
+    'x\n\n', "z//\n", "y", '\n 1 + reference_error //@ sourceURL=evaltest'));
 /*
 (function(x/\*,z//
 ,y*\/
 /\**\/) {
-1 + reference_error //# sourceURL=evaltest
+1 + reference_error //@ sourceURL=evaltest
 })
 */
 test("4:5", new Function(
-    'x/*', "z//\n", "y*/", '1 + reference_error //# sourceURL=evaltest'));
+    'x/*', "z//\n", "y*/", '1 + reference_error //@ sourceURL=evaltest'));
 /*
 (function () {
- 1 + reference_error //# sourceURL=evaltest5
+ 1 + reference_error //@ sourceURL=evaltest5
 })
 */
 test("2:6", eval(
-    '(function () {\n 1 + reference_error //# sourceURL=evaltest\n})'));
+    '(function () {\n 1 + reference_error //@ sourceURL=evaltest\n})'));

test/mjsunit/regress/regress-crbug-481896.js

@@ -29,7 +29,7 @@ function install() {
   eval("this.dynamic = function dynamic() { \n" +
        "  print(\"> dynamic\");  // Break\n" +
        "}\n" +
-       "//# sourceURL=dynamicScript");
+       "//@ sourceURL=dynamicScript");
 }
 
 install();
@@ -53,4 +53,4 @@ Debug.setListener(null);
 assertNull(exception);
 assertEquals(2, break_count);
 
-//# sourceURL=staticScript
+//@ sourceURL=staticScript

test/mjsunit/regress/regress-crbug-517592.js

@@ -8,7 +8,7 @@ var source =
   "var foo = function foo() {\n" +
   "  return 1;\n" +
   "}\n" +
-  "//# sourceURL=test";
+  "//@ sourceURL=test";
 
 Debug = debug.Debug;
 Debug.setListener(listener);

test/mjsunit/stack-traces.js

@@ -69,7 +69,7 @@ function testEvalWithSourceURL() {
 
 function testNestedEvalWithSourceURL() {
   var x = "FAIL";
-  var innerEval = 'function Inner() { eval(x); }\n//# sourceURL=res://inner-eval';
+  var innerEval = 'function Inner() { eval(x); }\n//@ sourceURL=res://inner-eval';
   eval("function Outer() { eval(innerEval); Inner(); }; Outer();\n//# sourceURL=res://outer-eval");
 }