Pass approprite task runners to AssociatedBinding::Bind via DevToolsAgent

This is part of efforts to replace base::ThreadTaskRunnerHandle::Get()
and SequencedTaskRunnerHandle::Get() with other appropriate task runners
in the renderer.

Bug: 786332
Change-Id: I91647355e2e9d955fcf62020fca175182f35e467
Reviewed-on: https://chromium-review.googlesource.com/c/1293258Reviewed-by: Alexander Timin <altimin@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Hajime Hoshi <hajimehoshi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601875}

third_party/blink/renderer/core/exported/web_dev_tools_agent_impl.cc

@@ -353,7 +353,9 @@ void WebDevToolsAgentImpl::WillBeDestroyed() {
 void WebDevToolsAgentImpl::BindRequest(
     mojom::blink::DevToolsAgentHostAssociatedPtrInfo host_ptr_info,
     mojom::blink::DevToolsAgentAssociatedRequest request) {
-  agent_->BindRequest(std::move(host_ptr_info), std::move(request));
+  agent_->BindRequest(
+      std::move(host_ptr_info), std::move(request),
+      web_local_frame_impl_->GetTaskRunner(blink::TaskType::kInternalDefault));
 }
 
 void WebDevToolsAgentImpl::DetachSession(InspectorSession* session) {

third_party/blink/renderer/core/inspector/devtools_agent.cc

@@ -89,7 +89,7 @@ class DevToolsAgent::Session::IOSession : public mojom::blink::DevToolsSession {
   ~IOSession() override {}
 
   void BindInterface(mojom::blink::DevToolsSessionRequest request) {
-    binding_.Bind(std::move(request));
+    binding_.Bind(std::move(request), io_task_runner_);
   }
 
   void DeleteSoon() { io_task_runner_->DeleteSoon(FROM_HERE, this); }
@@ -220,9 +220,10 @@ void DevToolsAgent::Dispose() {
 
 void DevToolsAgent::BindRequest(
     mojom::blink::DevToolsAgentHostAssociatedPtrInfo host_ptr_info,
-    mojom::blink::DevToolsAgentAssociatedRequest request) {
+    mojom::blink::DevToolsAgentAssociatedRequest request,
+    scoped_refptr<base::SingleThreadTaskRunner> task_runner) {
   DCHECK(!binding_);
-  binding_.Bind(std::move(request));
+  binding_.Bind(std::move(request), std::move(task_runner));
   host_ptr_.Bind(std::move(host_ptr_info));
   host_ptr_.set_connection_error_handler(
       WTF::Bind(&DevToolsAgent::CleanupConnection, WrapWeakPersistent(this)));

third_party/blink/renderer/core/inspector/devtools_agent.h

@@ -42,7 +42,8 @@ class CORE_EXPORT DevToolsAgent
   void Dispose();
   void FlushProtocolNotifications();
   void BindRequest(mojom::blink::DevToolsAgentHostAssociatedPtrInfo,
-                   mojom::blink::DevToolsAgentAssociatedRequest);
+                   mojom::blink::DevToolsAgentAssociatedRequest,
+                   scoped_refptr<base::SingleThreadTaskRunner> task_runner);
   virtual void Trace(blink::Visitor*);
 
  private: