[scheduler]: Expose agent ClusterId in FrameSchedulerImpl.

This will be used in follow up to compute agent
interference metric.
https://chromium-review.googlesource.com/c/chromium/src/+/1888091

Bug: 1019856
Change-Id: I493a253a4370cc24455efb0290a13f1579d7773e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1881726Reviewed-by: Alexander Timin <altimin@chromium.org>
Reviewed-by: David Bokan <bokan@chromium.org>
Reviewed-by: Yuta Kitamura <yutak@chromium.org>
Commit-Queue: Etienne Pierre-Doray <etiennep@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711428}

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

@@ -69,6 +69,7 @@
 #include "third_party/blink/renderer/core/editing/spellcheck/spell_checker.h"
 #include "third_party/blink/renderer/core/editing/suggestion/text_suggestion_controller.h"
 #include "third_party/blink/renderer/core/editing/surrounding_text.h"
+#include "third_party/blink/renderer/core/execution_context/window_agent.h"
 #include "third_party/blink/renderer/core/exported/web_plugin_container_impl.h"
 #include "third_party/blink/renderer/core/frame/ad_tracker.h"
 #include "third_party/blink/renderer/core/frame/csp/content_security_policy.h"
@@ -1471,6 +1472,11 @@ void LocalFrame::UpdateActiveSchedulerTrackedFeatures(uint64_t features_mask) {
   Client()->DidChangeActiveSchedulerTrackedFeatures(features_mask);
 }
 
+const base::UnguessableToken& LocalFrame::GetAgentClusterId() const {
+  return GetDocument() ? GetDocument()->GetWindowAgent().cluster_id()
+                       : base::UnguessableToken::Null();
+}
+
 const mojo::Remote<mojom::blink::ReportingServiceProxy>&
 LocalFrame::GetReportingService() const {
   if (!reporting_service_) {

third_party/blink/renderer/core/frame/local_frame.h

@@ -33,6 +33,7 @@
 
 #include "base/macros.h"
 #include "base/time/default_tick_clock.h"
+#include "base/unguessable_token.h"
 #include "mojo/public/cpp/bindings/associated_receiver.h"
 #include "mojo/public/cpp/bindings/associated_remote.h"
 #include "mojo/public/cpp/bindings/pending_associated_receiver.h"
@@ -484,6 +485,7 @@ class CORE_EXPORT LocalFrame final : public Frame,
   ukm::SourceId GetUkmSourceId() override;
   void UpdateTaskTime(base::TimeDelta time) override;
   void UpdateActiveSchedulerTrackedFeatures(uint64_t features_mask) override;
+  const base::UnguessableToken& GetAgentClusterId() const override;
 
   // Activates the user activation states of this frame and all its ancestors.
   void NotifyUserActivation(bool need_browser_verification);

third_party/blink/renderer/platform/scheduler/main_thread/frame_scheduler_impl.cc

@@ -1146,6 +1146,10 @@ FrameSchedulerImpl::CreateWebSchedulingTaskQueue(
                                                       task_queue.get());
 }
 
+const base::UnguessableToken& FrameSchedulerImpl::GetAgentClusterId() const {
+  return delegate_->GetAgentClusterId();
+}
+
 // static
 MainThreadTaskQueue::QueueTraits
 FrameSchedulerImpl::ThrottleableTaskQueueTraits() {

third_party/blink/renderer/platform/scheduler/main_thread/frame_scheduler_impl.h

@@ -187,6 +187,8 @@ class PLATFORM_EXPORT FrameSchedulerImpl : public FrameScheduler,
   std::unique_ptr<WebSchedulingTaskQueue> CreateWebSchedulingTaskQueue(
       WebSchedulingPriority) override;
 
+  const base::UnguessableToken& GetAgentClusterId() const;
+
  protected:
   FrameSchedulerImpl(MainThreadSchedulerImpl* main_thread_scheduler,
                      PageSchedulerImpl* parent_page_scheduler,

third_party/blink/renderer/platform/scheduler/main_thread/frame_scheduler_impl_unittest.cc

@@ -17,6 +17,7 @@
 #include "base/task/sequence_manager/test/sequence_manager_for_test.h"
 #include "base/test/scoped_feature_list.h"
 #include "base/test/task_environment.h"
+#include "base/unguessable_token.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/blink/public/common/features.h"
@@ -54,6 +55,10 @@ class FrameSchedulerDelegateForTesting : public FrameScheduler::Delegate {
     update_task_time_calls_++;
   }
 
+  const base::UnguessableToken& GetAgentClusterId() const override {
+    return base::UnguessableToken::Null();
+  }
+
   MOCK_METHOD1(UpdateActiveSchedulerTrackedFeatures, void(uint64_t));
 
   int update_task_time_calls_ = 0;

third_party/blink/renderer/platform/scheduler/public/frame_scheduler.h

@@ -9,6 +9,7 @@
 
 #include "base/memory/scoped_refptr.h"
 #include "base/single_thread_task_runner.h"
+#include "base/unguessable_token.h"
 #include "services/metrics/public/cpp/ukm_source_id.h"
 #include "third_party/blink/public/mojom/loader/pause_subresource_loading_handle.mojom-blink.h"
 #include "third_party/blink/public/platform/scheduler/web_resource_loading_task_runner_handle.h"
@@ -49,6 +50,8 @@ class FrameScheduler : public FrameOrWorkerScheduler {
     // accordingly.
     virtual void UpdateActiveSchedulerTrackedFeatures(
         uint64_t features_mask) = 0;
+
+    virtual const base::UnguessableToken& GetAgentClusterId() const = 0;
   };
 
   ~FrameScheduler() override = default;

third_party/blink/renderer/platform/scheduler/worker/worker_thread_scheduler_unittest.cc

@@ -464,6 +464,10 @@ class FrameSchedulerDelegateWithUkmSourceId : public FrameScheduler::Delegate {
 
   void UpdateActiveSchedulerTrackedFeatures(uint64_t features_mask) override {}
 
+  const base::UnguessableToken& GetAgentClusterId() const override {
+    return base::UnguessableToken::Null();
+  }
+
  private:
   ukm::SourceId source_id_;
 };