[MBI] Use per-AgentSchedulingGroup task runners for WidgetBase's mojo interfaces

Context:

per-AgentSchedulingGroup task runners should be used where appropriate.

What this CL does:

Use per-AgentSchedulingGroup task runners for WidgetBase's mojo interfaces instead of per-thread task runners.

Bug: 1105403
Change-Id: I5e59d59520320e50ebccce460da1735b8ee071d4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2497784Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Alexander Timin <altimin@chromium.org>
Reviewed-by: Kouhei Ueno <kouhei@chromium.org>
Commit-Queue: Minoru Chikamune <chikamune@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821533}

content/renderer/render_view_impl.cc

@@ -542,7 +542,8 @@ blink::WebPagePopup* RenderViewImpl::CreatePopup(
   // an owning pointer. It is de-referenced by calling Close().
   blink::WebPagePopup* popup_web_widget = blink::WebPagePopup::Create(
       popup_widget, std::move(blink_popup_widget_host),
-      std::move(blink_widget_host), std::move(blink_widget_receiver));
+      std::move(blink_widget_host), std::move(blink_widget_receiver),
+      agent_scheduling_group_.agent_group_scheduler().DefaultTaskRunner());
 
   // Adds a self-reference on the |popup_widget| so it will not be destroyed
   // when leaving scope. The WebPagePopup takes responsibility for Close()ing

third_party/blink/public/web/web_page_popup.h

@@ -60,7 +60,8 @@ class WebPagePopup : public WebWidget {
           popup_widget_host,
       CrossVariantMojoAssociatedRemote<mojom::WidgetHostInterfaceBase>
           widget_host,
-      CrossVariantMojoAssociatedReceiver<mojom::WidgetInterfaceBase> widget);
+      CrossVariantMojoAssociatedReceiver<mojom::WidgetInterfaceBase> widget,
+      scoped_refptr<base::SingleThreadTaskRunner> task_runner);
 
   // The popup's accessibility tree is connected to the main document's
   // accessibility tree. Access to the popup document is needed to ensure the

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

@@ -253,13 +253,15 @@ WebPagePopupImpl::WebPagePopupImpl(
     CrossVariantMojoAssociatedRemote<mojom::blink::WidgetHostInterfaceBase>
         widget_host,
     CrossVariantMojoAssociatedReceiver<mojom::blink::WidgetInterfaceBase>
-        widget)
+        widget,
+    scoped_refptr<base::SingleThreadTaskRunner> task_runner)
     : web_page_popup_client_(client),
       popup_widget_host_(std::move(popup_widget_host)),
       widget_base_(
           std::make_unique<WidgetBase>(this,
                                        std::move(widget_host),
                                        std::move(widget),
+                                       task_runner,
                                        /*hidden=*/false,
                                        /*never_composited=*/false,
                                        /*is_for_child_local_root=*/false)) {
@@ -980,7 +982,8 @@ WebPagePopup* WebPagePopup::Create(
     CrossVariantMojoAssociatedRemote<mojom::blink::WidgetHostInterfaceBase>
         widget_host,
     CrossVariantMojoAssociatedReceiver<mojom::blink::WidgetInterfaceBase>
-        widget) {
+        widget,
+    scoped_refptr<base::SingleThreadTaskRunner> task_runner) {
   CHECK(client);
   // A WebPagePopupImpl instance usually has two references.
   //  - One owned by the instance itself. It represents the visible widget.
@@ -988,9 +991,9 @@ WebPagePopup* WebPagePopup::Create(
   //    WebPagePopupImpl to close.
   // We need them because the closing operation is asynchronous and the widget
   // can be closed while the WebViewImpl is unaware of it.
-  auto popup = base::AdoptRef(
-      new WebPagePopupImpl(client, std::move(popup_widget_host),
-                           std::move(widget_host), std::move(widget)));
+  auto popup = base::AdoptRef(new WebPagePopupImpl(
+      client, std::move(popup_widget_host), std::move(widget_host),
+      std::move(widget), task_runner));
   popup->AddRef();
   return popup.get();
 }

third_party/blink/renderer/core/exported/web_page_popup_impl.h

@@ -217,7 +217,8 @@ class CORE_EXPORT WebPagePopupImpl final : public WebPagePopup,
       CrossVariantMojoAssociatedRemote<mojom::blink::WidgetHostInterfaceBase>
           widget_host,
       CrossVariantMojoAssociatedReceiver<mojom::blink::WidgetInterfaceBase>
-          widget);
+          widget,
+      scoped_refptr<base::SingleThreadTaskRunner> task_runner);
   void DestroyPage();
   void SetRootLayer(scoped_refptr<cc::Layer>);
   void SetWebView(WebViewImpl* web_view);

third_party/blink/renderer/core/frame/web_frame_widget_base.cc

@@ -173,6 +173,7 @@ WebFrameWidgetBase::WebFrameWidgetBase(
     : widget_base_(std::make_unique<WidgetBase>(this,
                                                 std::move(widget_host),
                                                 std::move(widget),
+                                                task_runner,
                                                 hidden,
                                                 never_composited,
                                                 is_for_child_local_root)),

third_party/blink/renderer/platform/widget/compositing/widget_compositor_unittest.cc

@@ -79,6 +79,7 @@ class WidgetCompositorTest : public cc::LayerTreeTest {
 
     widget_base_ = std::make_unique<WidgetBase>(
         &client_, widget_host_remote.Unbind(), std::move(widget_receiver),
+        base::ThreadTaskRunnerHandle::Get(),
         /*is_hidden=*/false,
         /*never_composited=*/false,
         /*is_for_child_local_root=*/false);

third_party/blink/renderer/platform/widget/widget_base.cc

@@ -141,12 +141,13 @@ WidgetBase::WidgetBase(
     CrossVariantMojoAssociatedRemote<mojom::WidgetHostInterfaceBase>
         widget_host,
     CrossVariantMojoAssociatedReceiver<mojom::WidgetInterfaceBase> widget,
+    scoped_refptr<base::SingleThreadTaskRunner> task_runner,
     bool hidden,
     bool never_composited,
     bool is_for_child_local_root)
     : client_(client),
-      widget_host_(std::move(widget_host)),
-      receiver_(this, std::move(widget)),
+      widget_host_(std::move(widget_host), task_runner),
+      receiver_(this, std::move(widget), task_runner),
       next_previous_flags_(kInvalidNextPreviousFlagsValue),
       use_zoom_for_dsf_(Platform::Current()->IsUseZoomForDSFEnabled()),
       is_hidden_(hidden),

third_party/blink/renderer/platform/widget/widget_base.h

@@ -65,6 +65,7 @@ class PLATFORM_EXPORT WidgetBase : public mojom::blink::Widget,
       CrossVariantMojoAssociatedRemote<mojom::WidgetHostInterfaceBase>
           widget_host,
       CrossVariantMojoAssociatedReceiver<mojom::WidgetInterfaceBase> widget,
+      scoped_refptr<base::SingleThreadTaskRunner> task_runner,
       bool hidden,
       bool never_composited,
       bool is_for_child_local_root);