Revert of Revert "Post loading tasks on the appropriate WebFrameScheduler's queue."

content/child/web_url_loader_impl.cc

Index: content/child/web_url_loader_impl.cc
diff --git a/content/child/web_url_loader_impl.cc b/content/child/web_url_loader_impl.cc
index bf669cc597b3bf8fbfa27cea9852543012e7d3f6..68851d43ee3c555d325fe6d257e5a6bfa804fbab 100644
--- a/content/child/web_url_loader_impl.cc
+++ b/content/child/web_url_loader_impl.cc
@@ -16,6 +16,7 @@
 #include "base/strings/string_util.h"
 #include "base/time/time.h"
 #include "components/mime_util/mime_util.h"
+#include "components/scheduler/child/web_task_runner_impl.h"
 #include "content/child/child_thread_impl.h"
 #include "content/child/ftp_directory_listing_response_delegate.h"
 #include "content/child/multipart_response_delegate.h"
@@ -42,6 +43,7 @@
 #include "net/ssl/ssl_connection_status_flags.h"
 #include "net/url_request/url_request_data_job.h"
 #include "third_party/WebKit/public/platform/WebHTTPLoadInfo.h"
+#include "third_party/WebKit/public/platform/WebTraceLocation.h"
 #include "third_party/WebKit/public/platform/WebURL.h"
 #include "third_party/WebKit/public/platform/WebURLError.h"
 #include "third_party/WebKit/public/platform/WebURLLoadTiming.h"
@@ -254,7 +256,7 @@
  public:
   Context(WebURLLoaderImpl* loader,
           ResourceDispatcher* resource_dispatcher,
-          scoped_refptr<base::SingleThreadTaskRunner> task_runner);
+          scoped_ptr<blink::WebTaskRunner> task_runner);
 
   WebURLLoaderClient* client() const { return client_; }
   void set_client(WebURLLoaderClient* client) { client_ = client; }
@@ -267,6 +269,7 @@
       blink::WebThreadedDataReceiver* threaded_data_receiver);
   void Start(const WebURLRequest& request,
              SyncLoadResponse* sync_load_response);
+  void SetWebTaskRunner(scoped_ptr<blink::WebTaskRunner> task_runner);
 
   // RequestPeer methods:
   void OnUploadProgress(uint64 position, uint64 size) override;
@@ -295,6 +298,19 @@
   friend class base::RefCounted<Context>;
   ~Context() override;
 
+  class HandleDataURLTask : public blink::WebTaskRunner::Task {
+   public:
+    explicit HandleDataURLTask(scoped_refptr<Context> context)
+        : context_(context) {}
+
+    void run() override {
+      context_->HandleDataURL();
+    }
+
+   private:
+    scoped_refptr<Context> context_;
+  };
+
   // Called when the body data stream is detached from the reader side.
   void CancelBodyStreaming();
   // We can optimize the handling of data URLs in most cases.
@@ -305,7 +321,7 @@
   WebURLRequest request_;
   WebURLLoaderClient* client_;
   ResourceDispatcher* resource_dispatcher_;
-  scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
+  scoped_ptr<blink::WebTaskRunner> web_task_runner_;
   WebReferrerPolicy referrer_policy_;
   scoped_ptr<FtpDirectoryListingResponseDelegate> ftp_listing_delegate_;
   scoped_ptr<MultipartResponseDelegate> multipart_delegate_;
@@ -319,11 +335,11 @@
 WebURLLoaderImpl::Context::Context(
     WebURLLoaderImpl* loader,
     ResourceDispatcher* resource_dispatcher,
-    scoped_refptr<base::SingleThreadTaskRunner> task_runner)
+    scoped_ptr<blink::WebTaskRunner> web_task_runner)
     : loader_(loader),
       client_(NULL),
       resource_dispatcher_(resource_dispatcher),
-      task_runner_(task_runner),
+      web_task_runner_(web_task_runner.Pass()),
       referrer_policy_(blink::WebReferrerPolicyDefault),
       defers_loading_(NOT_DEFERRING),
       request_id_(-1) {
@@ -359,8 +375,11 @@
     defers_loading_ = SHOULD_DEFER;
   } else if (!value && defers_loading_ != NOT_DEFERRING) {
     if (defers_loading_ == DEFERRED_DATA) {
-      task_runner_->PostTask(FROM_HERE,
-                             base::Bind(&Context::HandleDataURL, this));
+      // TODO(alexclarke): Find a way to let blink and chromium FROM_HERE
+      // coexist.
+      web_task_runner_->postTask(
+          ::blink::WebTraceLocation(__FUNCTION__, __FILE__),
+          new HandleDataURLTask(this));
     }
     defers_loading_ = NOT_DEFERRING;
   }
@@ -418,8 +437,11 @@
           GetInfoFromDataURL(sync_load_response->url, sync_load_response,
                              &sync_load_response->data);
     } else {
-      task_runner_->PostTask(FROM_HERE,
-                             base::Bind(&Context::HandleDataURL, this));
+      // TODO(alexclarke): Find a way to let blink and chromium FROM_HERE
+      // coexist.
+      web_task_runner_->postTask(
+          ::blink::WebTraceLocation(__FUNCTION__, __FILE__),
+          new HandleDataURLTask(this));
     }
     return;
   }
@@ -482,6 +504,7 @@
       GetRequestContextFrameTypeForWebURLRequest(request);
   request_info.extra_data = request.extraData();
   request_info.report_raw_headers = request.reportRawHeaders();
+  request_info.loading_web_task_runner.reset(web_task_runner_->clone());
 
   scoped_refptr<ResourceRequestBody> request_body =
       GetRequestBodyForWebURLRequest(request).get();
@@ -494,6 +517,11 @@
 
   request_id_ = resource_dispatcher_->StartAsync(
       request_info, request_body.get(), this);
+}
+
+void WebURLLoaderImpl::Context::SetWebTaskRunner(
+    scoped_ptr<blink::WebTaskRunner> web_task_runner) {
+  web_task_runner_ = web_task_runner.Pass();
 }
 
 void WebURLLoaderImpl::Context::OnUploadProgress(uint64 position, uint64 size) {
@@ -841,8 +869,8 @@
 
 WebURLLoaderImpl::WebURLLoaderImpl(
     ResourceDispatcher* resource_dispatcher,
-    scoped_refptr<base::SingleThreadTaskRunner> task_runner)
-    : context_(new Context(this, resource_dispatcher, task_runner)) {
+    scoped_ptr<blink::WebTaskRunner> web_task_runner)
+    : context_(new Context(this, resource_dispatcher, web_task_runner.Pass())) {
 }
 
 WebURLLoaderImpl::~WebURLLoaderImpl() {
@@ -1059,4 +1087,11 @@
   return context_->AttachThreadedDataReceiver(threaded_data_receiver);
 }
 
+void WebURLLoaderImpl::setLoadingTaskRunner(
+    blink::WebTaskRunner* loading_task_runner) {
+  // There's no guarantee on the lifetime of |loading_task_runner| so we take a
+  // copy.
+  context_->SetWebTaskRunner(make_scoped_ptr(loading_task_runner->clone()));
+}
+
 }  // namespace content