WIP: Reland CompiledScript, prototype compiling in a separate task.

third_party/WebKit/Source/core/html/parser/HTMLParserScriptRunner.cpp

Index: third_party/WebKit/Source/core/html/parser/HTMLParserScriptRunner.cpp
diff --git a/third_party/WebKit/Source/core/html/parser/HTMLParserScriptRunner.cpp b/third_party/WebKit/Source/core/html/parser/HTMLParserScriptRunner.cpp
index 24066e601b88f18d3059da6ea6070b67cb270c1a..eb1a1817876a714d5639d9012222aa0e376862d4 100644
--- a/third_party/WebKit/Source/core/html/parser/HTMLParserScriptRunner.cpp
+++ b/third_party/WebKit/Source/core/html/parser/HTMLParserScriptRunner.cpp
@@ -79,14 +79,16 @@ std::unique_ptr<TracedValue> getTraceArgsForScriptElement(
 
 bool doExecuteScript(Element* scriptElement,
                      const ScriptSourceCode& sourceCode,
-                     const TextPosition& textPosition) {
+                     const TextPosition& textPosition,
+                     CompiledScript* compiledScript = nullptr) {
   ScriptLoader* scriptLoader = toScriptLoaderIfPossible(scriptElement);
   DCHECK(scriptLoader);
-  TRACE_EVENT_WITH_FLOW1(
+  TRACE_EVENT_WITH_FLOW2(
       "blink", "HTMLParserScriptRunner ExecuteScript", scriptElement,
       TRACE_EVENT_FLAG_FLOW_IN, "data",
-      getTraceArgsForScriptElement(scriptElement, textPosition));
-  return scriptLoader->executeScript(sourceCode);
+      getTraceArgsForScriptElement(scriptElement, textPosition),
+      "compiledScript", compiledScript);
+  return scriptLoader->executeScript(sourceCode, compiledScript);
 }
 
 void traceParserBlockingScript(const PendingScript* pendingScript,
@@ -226,6 +228,7 @@ void HTMLParserScriptRunner::executePendingScriptAndDispatchEvent(
   double scriptParserBlockingTime =
       pendingScript->parserBlockingLoadStartTime();
   Element* element = pendingScript->element();
+  CompiledScript* compiledScript = pendingScript->getCompiledScript();
 
   // 1. "Let the script be the pending parsing-blocking script.
   //     There is no longer a pending parsing-blocking script."
@@ -262,7 +265,8 @@ void HTMLParserScriptRunner::executePendingScriptAndDispatchEvent(
                 monotonicallyIncreasingTime() - scriptParserBlockingTime,
                 scriptLoader->wasCreatedDuringDocumentWrite());
       }
-      if (!doExecuteScript(element, sourceCode, scriptStartPosition)) {
+      if (!doExecuteScript(element, sourceCode, scriptStartPosition,
+                           compiledScript)) {
         scriptLoader->dispatchErrorEvent();
       } else {
         element->dispatchEvent(Event::create(EventTypeNames::load));
@@ -355,6 +359,9 @@ void HTMLParserScriptRunner::possiblyFetchBlockedDocWriteScript(
 
 void HTMLParserScriptRunner::pendingScriptFinished(
     PendingScript* pendingScript) {
+  LOG(ERROR) << "Finished loading pending script of size "
+             << pendingScript->resource()->size();
+
   // Handle cancellations of parser-blocking script loads without
   // notifying the host (i.e., parser) if these were initiated by nested
   // document.write()s. The cancellation may have been triggered by
@@ -666,6 +673,7 @@ void HTMLParserScriptRunner::processScriptElementInternal(
         // "Immediately execute the script block,
         //  even if other scripts are already executing."
         // TODO(hiroshige): Merge the block into ScriptLoader::prepareScript().
+        TRACE_EVENT0("blink", "HTMLParserScriptRunner immediate-execute");
         DCHECK_GT(m_reentryPermit->scriptNestingLevel(), 1u);
         if (m_parserBlockingScript)
           m_parserBlockingScript->dispose();