[blink] Allow in-order scripts to be streamed

Currently, in-order scripts (i.e. <script> tags that are inserted
dynamically instead of by the parser) never request streaming. Given
recent streaming improvements, we can now afford to stream these
scripts.

As a drive-by, also allow async scripts encountered while the script
runner is suspended to also be streamed, since otherwise they will
never stream.

Bug: 865098
Change-Id: I095deb4ac8ceab86c8db0473357b093822cb3b61
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1630159Reviewed-by: Kouhei Ueno <kouhei@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#664204}

third_party/blink/renderer/core/script/script_runner.cc

@@ -47,12 +47,10 @@ ScriptRunner::ScriptRunner(Document* document)
 void ScriptRunner::QueueScriptForExecution(PendingScript* pending_script) {
   DCHECK(pending_script);
   document_->IncrementLoadEventDelayCount();
+  pending_script->StartStreamingIfPossible();
   switch (pending_script->GetSchedulingType()) {
     case ScriptSchedulingType::kAsync:
       pending_async_scripts_.insert(pending_script);
-      if (!is_suspended_) {
-        pending_script->StartStreamingIfPossible();
-      }
       break;
 
     case ScriptSchedulingType::kInOrder: