Script streaming: turn off cached data to prevent crashes.

Cached data was turned on by r184826, and it seems we're producing invalid
cached data. Disabling the cached data for now; this needs to be debugged before
enabling it again.

In addition, it can be that we try to invoke streaming for already loaded async
scripts; handle that gracefully too.

BUG=

Review URL: https://codereview.chromium.org/705953002

git-svn-id: svn://svn.chromium.org/blink/trunk@184911 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/bindings/core/v8/ScriptStreamer.cpp

@@ -506,7 +506,8 @@ bool ScriptStreamer::startStreamingInternal(PendingScript& script, Settings* set
         return false;
 
     ScriptResource* resource = script.resource();
-    ASSERT(!resource->isLoaded());
+    if (resource->isLoaded())
+        return false;
     if (!resource->url().protocolIsInHTTPFamily())
         return false;
     if (resource->resourceToRevalidate()) {

third_party/WebKit/Source/bindings/core/v8/V8ScriptRunner.cpp

@@ -127,7 +127,9 @@ v8::Local<v8::Script> V8ScriptRunner::compileScript(v8::Handle<v8::String> code,
         const v8::ScriptCompiler::CachedData* newCachedData = streamer->source()->GetCachedData();
         if (newCachedData) {
             resource->clearCachedMetadata();
-            resource->setCachedMetadata(streamer->cachedDataType(), reinterpret_cast<const char*>(newCachedData->data), newCachedData->length);
+            // Temporarily disable cached metadata for streaming; it's
+            // producing broken data. FIXME: enable it again.
+            // resource->setCachedMetadata(streamer->cachedDataType(), reinterpret_cast<const char*>(newCachedData->data), newCachedData->length);
         }
     } else if (!resource || !resource->url().protocolIsInHTTPFamily() || code->Length() < 1024) {
         v8::ScriptCompiler::Source source(code, origin);