[Blink-Scheduler] Distinguish between normal and foreground-only renderers for monitoring load.

third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_RENDERER_RENDERER_SCHEDULER_IMPL_H_
 #define THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_RENDERER_RENDERER_SCHEDULER_IMPL_H_
 
+#include <memory>
+
 #include "base/atomicops.h"
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
 #include "base/single_thread_task_runner.h"
 #include "base/synchronization/lock.h"
 #include "base/trace_event/trace_log.h"
 #include "device/base/synchronization/shared_memory_seqlock_buffer.h"
 #include "platform/scheduler/base/pollable_thread_safe_flag.h"
 #include "platform/scheduler/base/queueing_time_estimator.h"
@@ skipping 58 matching lines @@
     // A continuous gesture (e.g., scroll) which is being handled by the main
     // thread.
     MAIN_THREAD_GESTURE,
     // Must be the last entry.
     USE_CASE_COUNT,
     FIRST_USE_CASE = NONE,
   };
   static const char* UseCaseToString(UseCase use_case);
   static const char* RAILModeToString(v8::RAILMode rail_mode);
 
-  RendererSchedulerImpl(scoped_refptr<SchedulerTqmDelegate> main_task_runner);
+  RendererSchedulerImpl(
+      scoped_refptr<SchedulerTqmDelegate> main_task_runner,
+      RendererType type = RendererType::kForegroundAndBackground);
   ~RendererSchedulerImpl() override;
 
   // RendererScheduler implementation:
   std::unique_ptr<WebThread> CreateMainThread() override;
   scoped_refptr<SingleThreadIdleTaskRunner> IdleTaskRunner() override;
   std::unique_ptr<RenderWidgetSchedulingState> NewRenderWidgetSchedulingState()
       override;
   void WillBeginFrame(const cc::BeginFrameArgs& args) override;
   void BeginFrameNotExpectedSoon() override;
   void BeginMainFrameNotExpectedUntil(base::TimeTicks time) override;
@@ skipping 351 matching lines @@
 
   SeqLockQueueingTimeEstimator seqlock_queueing_time_estimator_;
 
   // We have decided to improve thread safety at the cost of some boilerplate
   // (the accessors) for the following data members.
 
   struct MainThreadOnly {
     MainThreadOnly(RendererSchedulerImpl* renderer_scheduler_impl,
                    const scoped_refptr<TaskQueue>& compositor_task_runner,
                    base::TickClock* time_source,
-                   base::TimeTicks now);
+                   base::TimeTicks now,
+                   RendererType type);
     ~MainThreadOnly();
 
     TaskCostEstimator loading_task_cost_estimator;
     TaskCostEstimator timer_task_cost_estimator;
     IdleTimeEstimator idle_time_estimator;
-    ThreadLoadTracker background_main_thread_load_tracker;
-    ThreadLoadTracker foreground_main_thread_load_tracker;
+    std::unique_ptr<ThreadLoadTracker> background_main_thread_load_tracker;
+    std::unique_ptr<ThreadLoadTracker> foreground_main_thread_load_tracker;
+    std::unique_ptr<ThreadLoadTracker> foreground_only_main_thread_load_tracker;
     UseCase current_use_case;
     Policy current_policy;
     base::TimeTicks current_policy_expiration_time;
     base::TimeTicks estimated_next_frame_begin;
     base::TimeTicks current_task_start_time;
     base::TimeTicks uma_last_queueing_time_report_window_start_time;
     base::TimeDelta compositor_frame_interval;
     base::TimeDelta longest_jank_free_task_duration;
     base::Optional<base::TimeTicks> last_audio_state_change;
     int timer_queue_suspend_count;  // TIMER_TASK_QUEUE suspended if non-zero.
@@ skipping 54 matching lines @@
 #if DCHECK_IS_ON()
       // We don't actually care which thread this called from, just so long as
       // its consistent.
       if (!compositor_thread_checker)
         compositor_thread_checker.reset(new base::ThreadChecker());
       DCHECK(compositor_thread_checker->CalledOnValidThread());
 #endif
     }
   };
 
+  RendererType type_;
+
   // Don't access main_thread_only_, instead use MainThreadOnly().
   MainThreadOnly main_thread_only_;
   MainThreadOnly& GetMainThreadOnly() {
     helper_.CheckOnValidThread();
     return main_thread_only_;
   }
   const struct MainThreadOnly& GetMainThreadOnly() const {
     helper_.CheckOnValidThread();
     return main_thread_only_;
   }
@@ skipping 21 matching lines @@
 
   base::WeakPtrFactory<RendererSchedulerImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RendererSchedulerImpl);
 };
 
 }  // namespace scheduler
 }  // namespace blink
 
 #endif  // THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_RENDERER_RENDERER_SCHEDULER_IMPL_H_