Wire the scheduler up in TestBlinkWebUnitTestSupport

This is needed to make the webkit_unit_tests pass when the HTML parseing
tasks are posted on the loading task queue. Required for patch
https://codereview.chromium.org/876623002

BUG=391005

Review URL: https://codereview.chromium.org/878413002

Cr-Commit-Position: refs/heads/master@{#314002}

content/renderer/scheduler/web_scheduler_impl.h

@@ -8,6 +8,7 @@
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/time/time.h"
+#include "content/common/content_export.h"
 #include "third_party/WebKit/public/platform/WebScheduler.h"
 #include "third_party/WebKit/public/platform/WebThread.h"
 
@@ -16,7 +17,7 @@ namespace content {
 class RendererScheduler;
 class SingleThreadIdleTaskRunner;
 
-class WebSchedulerImpl : public blink::WebScheduler {
+class CONTENT_EXPORT WebSchedulerImpl : public blink::WebScheduler {
  public:
   WebSchedulerImpl(RendererScheduler* renderer_scheduler);
   ~WebSchedulerImpl() override;

content/test/test_blink_web_unit_test_support.cc

@@ -12,6 +12,8 @@
 #include "base/path_service.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/public/common/content_switches.h"
+#include "content/renderer/scheduler/renderer_scheduler.h"
+#include "content/renderer/scheduler/web_scheduler_impl.h"
 #include "content/test/mock_webclipboard_impl.h"
 #include "content/test/web_gesture_curve_mock.h"
 #include "content/test/web_layer_tree_view_impl_for_testing.h"
@@ -319,4 +321,14 @@ bool TestBlinkWebUnitTestSupport::getBlobItems(
   return blob_registry_.GetBlobItems(uuid, items);
 }
 
+blink::WebScheduler* TestBlinkWebUnitTestSupport::scheduler() {
+  // Lazily create the WebSchedulerImpl and RendererScheduler if needed.
+  if (!web_scheduler_) {
+    if (!renderer_scheduler_)
+      renderer_scheduler_ = RendererScheduler::Create();
+    web_scheduler_.reset(new WebSchedulerImpl(renderer_scheduler_.get()));
+  }
+  return web_scheduler_.get();
+}
+
 }  // namespace content

content/test/test_blink_web_unit_test_support.h

@@ -25,6 +25,8 @@ class WebLayerTreeView;
 }
 
 namespace content {
+class RendererScheduler;
+class WebSchedulerImpl;
 
 // An implementation of blink::WebUnitTestSupport and BlinkPlatformImpl for
 // tests.
@@ -83,6 +85,7 @@ class TestBlinkWebUnitTestSupport : public blink::WebUnitTestSupport,
   virtual blink::WebData readFromFile(const blink::WebString& path);
   virtual bool getBlobItems(const blink::WebString& uuid,
                             blink::WebVector<blink::WebBlobData::Item*>* items);
+  virtual blink::WebScheduler* scheduler();
 
  private:
   MockWebBlobRegistryImpl blob_registry_;
@@ -93,6 +96,8 @@ class TestBlinkWebUnitTestSupport : public blink::WebUnitTestSupport,
   scoped_ptr<WebURLLoaderMockFactory> url_loader_factory_;
   cc_blink::WebCompositorSupportImpl compositor_support_;
   scoped_ptr<base::StatsTable> stats_table_;
+  scoped_ptr<RendererScheduler> renderer_scheduler_;
+  scoped_ptr<WebSchedulerImpl> web_scheduler_;
 
 #if defined(OS_WIN) || defined(OS_MACOSX)
   blink::WebThemeEngine* active_theme_engine_;