cc: Generalize raster task notifications

cc/resources/pixel_buffer_raster_worker_pool.cc

 // Copyright 2013 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.
 
 #include "cc/resources/pixel_buffer_raster_worker_pool.h"
 
 #include <algorithm>
 
 #include "base/containers/stack_container.h"
 #include "base/debug/trace_event.h"
 #include "base/debug/trace_event_argument.h"
+#include "base/strings/stringprintf.h"
 #include "cc/debug/traced_value.h"
 #include "cc/resources/resource.h"
 #include "gpu/command_buffer/client/gles2_interface.h"
 
 namespace cc {
 namespace {
 
 const int kCheckForCompletedRasterTasksDelayMs = 6;
 
 const size_t kMaxScheduledRasterTasks = 48;
 
 typedef base::StackVector<RasterTask*, kMaxScheduledRasterTasks>
     RasterTaskVector;
 
 }  // namespace
 
+PixelBufferRasterWorkerPool::RasterTaskState::RasterTaskState(
+    RasterTask* task,
+    const TaskSetCollection& task_sets)
+    : type(UNSCHEDULED), task(task), task_sets(task_sets) {
+}
+
 // static
 scoped_ptr<RasterWorkerPool> PixelBufferRasterWorkerPool::Create(
     base::SequencedTaskRunner* task_runner,
     TaskGraphRunner* task_graph_runner,
     ContextProvider* context_provider,
     ResourceProvider* resource_provider,
     size_t max_transfer_buffer_usage_bytes) {
   return make_scoped_ptr<RasterWorkerPool>(
       new PixelBufferRasterWorkerPool(task_runner,
                                       task_graph_runner,
                                       context_provider,
                                       resource_provider,
                                       max_transfer_buffer_usage_bytes));
 }
 
 PixelBufferRasterWorkerPool::PixelBufferRasterWorkerPool(
     base::SequencedTaskRunner* task_runner,
     TaskGraphRunner* task_graph_runner,
     ContextProvider* context_provider,
     ResourceProvider* resource_provider,
     size_t max_transfer_buffer_usage_bytes)
     : task_runner_(task_runner),
       task_graph_runner_(task_graph_runner),
       namespace_token_(task_graph_runner->GetNamespaceToken()),
       context_provider_(context_provider),
       resource_provider_(resource_provider),
       shutdown_(false),
       scheduled_raster_task_count_(0u),
-      raster_tasks_required_for_activation_count_(0u),
       bytes_pending_upload_(0u),
       max_bytes_pending_upload_(max_transfer_buffer_usage_bytes),
       has_performed_uploads_since_last_flush_(false),
-      should_notify_client_if_no_tasks_are_pending_(false),
-      should_notify_client_if_no_tasks_required_for_activation_are_pending_(
-          false),
-      raster_finished_task_pending_(false),
-      raster_required_for_activation_finished_task_pending_(false),
       check_for_completed_raster_task_notifier_(
           task_runner,
           base::Bind(&PixelBufferRasterWorkerPool::CheckForCompletedRasterTasks,
                      base::Unretained(this)),
           base::TimeDelta::FromMilliseconds(
               kCheckForCompletedRasterTasksDelayMs)),
       raster_finished_weak_ptr_factory_(this) {
   DCHECK(context_provider_);
 }
 
 PixelBufferRasterWorkerPool::~PixelBufferRasterWorkerPool() {
   DCHECK_EQ(0u, raster_task_states_.size());
   DCHECK_EQ(0u, raster_tasks_with_pending_upload_.size());
   DCHECK_EQ(0u, completed_raster_tasks_.size());
   DCHECK_EQ(0u, completed_image_decode_tasks_.size());
-  DCHECK_EQ(0u, raster_tasks_required_for_activation_count_);
+  DCHECK(task_set_sizes_ == TaskSetSizes());
 }
 
 Rasterizer* PixelBufferRasterWorkerPool::AsRasterizer() { return this; }
 
 void PixelBufferRasterWorkerPool::SetClient(RasterizerClient* client) {
   client_ = client;
 }
 
 void PixelBufferRasterWorkerPool::Shutdown() {
   TRACE_EVENT0("cc", "PixelBufferRasterWorkerPool::Shutdown");
@@ skipping 19 matching lines @@
       completed_raster_tasks_.push_back(state.task);
       state.type = RasterTaskState::COMPLETED;
     }
   }
   DCHECK_EQ(completed_raster_tasks_.size(), raster_task_states_.size());
 }
 
 void PixelBufferRasterWorkerPool::ScheduleTasks(RasterTaskQueue* queue) {
   TRACE_EVENT0("cc", "PixelBufferRasterWorkerPool::ScheduleTasks");
 
-  DCHECK_EQ(queue->required_for_activation_count,
-            static_cast<size_t>(
-                std::count_if(queue->items.begin(),
-                              queue->items.end(),
-                              RasterTaskQueue::Item::IsRequiredForActivation)));
-
-  if (!should_notify_client_if_no_tasks_are_pending_)
+  if (should_notify_client_if_no_tasks_in_set_are_pending_.none())
     TRACE_EVENT_ASYNC_BEGIN0("cc", "ScheduledTasks", this);
 
-  should_notify_client_if_no_tasks_are_pending_ = true;
-  should_notify_client_if_no_tasks_required_for_activation_are_pending_ = true;
-
-  raster_tasks_required_for_activation_count_ = 0u;
+  should_notify_client_if_no_tasks_in_set_are_pending_.set();
+  task_set_sizes_ = TaskSetSizes();
 
   // Update raster task state and remove items from old queue.
   for (RasterTaskQueue::Item::Vector::const_iterator it = queue->items.begin();
        it != queue->items.end();
        ++it) {
     const RasterTaskQueue::Item& item = *it;
     RasterTask* task = item.task;
 
     // Remove any old items that are associated with this task. The result is
     // that the old queue is left with all items not present in this queue,
     // which we use below to determine what tasks need to be canceled.
     RasterTaskQueue::Item::Vector::iterator old_it =
         std::find_if(raster_tasks_.items.begin(),
                      raster_tasks_.items.end(),
                      RasterTaskQueue::Item::TaskComparator(task));
     if (old_it != raster_tasks_.items.end()) {
       std::swap(*old_it, raster_tasks_.items.back());
       raster_tasks_.items.pop_back();
     }
 
     RasterTaskState::Vector::iterator state_it =
         std::find_if(raster_task_states_.begin(),
                      raster_task_states_.end(),
                      RasterTaskState::TaskComparator(task));
     if (state_it != raster_task_states_.end()) {
       RasterTaskState& state = *state_it;
 
-      state.required_for_activation = item.required_for_activation;
+      state.task_sets = item.task_sets;
       // |raster_tasks_required_for_activation_count| accounts for all tasks
       // that need to complete before we can send a "ready to activate" signal.
       // Tasks that have already completed should not be part of this count.
-      if (state.type != RasterTaskState::COMPLETED) {
-        raster_tasks_required_for_activation_count_ +=
-            item.required_for_activation;
-      }
+      if (state.type != RasterTaskState::COMPLETED)
+        task_set_sizes_ += item.task_sets;
+
       continue;
     }
 
     DCHECK(!task->HasBeenScheduled());
-    raster_task_states_.push_back(
-        RasterTaskState(task, item.required_for_activation));
-    raster_tasks_required_for_activation_count_ += item.required_for_activation;
+    raster_task_states_.push_back(RasterTaskState(task, item.task_sets));
+    task_set_sizes_ += item.task_sets;
   }
 
   // Determine what tasks in old queue need to be canceled.
   for (RasterTaskQueue::Item::Vector::const_iterator it =
            raster_tasks_.items.begin();
        it != raster_tasks_.items.end();
        ++it) {
     const RasterTaskQueue::Item& item = *it;
     RasterTask* task = item.task;
 
@@ skipping 11 matching lines @@
     // Unscheduled task can be canceled.
     if (state.type == RasterTaskState::UNSCHEDULED) {
       DCHECK(!task->HasBeenScheduled());
       DCHECK(std::find(completed_raster_tasks_.begin(),
                        completed_raster_tasks_.end(),
                        task) == completed_raster_tasks_.end());
       completed_raster_tasks_.push_back(task);
       state.type = RasterTaskState::COMPLETED;
     }
 
-    // No longer required for activation.
-    state.required_for_activation = false;
+    // No longer in any task set.
+    state.task_sets.reset();
   }
 
   raster_tasks_.Swap(queue);
 
   // Check for completed tasks when ScheduleTasks() is called as
   // priorities might have changed and this maximizes the number
   // of top priority tasks that are scheduled.
   CheckForCompletedRasterizerTasks();
   CheckForCompletedUploads();
   FlushUploads();
@@ skipping 53 matching lines @@
 }
 
 void PixelBufferRasterWorkerPool::ReleaseBufferForRaster(RasterTask* task) {
   DCHECK(std::find_if(raster_task_states_.begin(),
                       raster_task_states_.end(),
                       RasterTaskState::TaskComparator(task)) !=
          raster_task_states_.end());
   resource_provider_->ReleasePixelRasterBuffer(task->resource()->id());
 }
 
-void PixelBufferRasterWorkerPool::OnRasterFinished() {
-  TRACE_EVENT0("cc", "PixelBufferRasterWorkerPool::OnRasterFinished");
+void PixelBufferRasterWorkerPool::OnRasterTaskSetFinished(TaskSet task_set) {
+  TRACE_EVENT1("cc",
+               "PixelBufferRasterWorkerPool::OnRasterTaskSetFinished",
+               "task_set",
+               task_set);
 
-  // |should_notify_client_if_no_tasks_are_pending_| can be set to false as
-  // a result of a scheduled CheckForCompletedRasterTasks() call. No need to
-  // perform another check in that case as we've already notified the client.
-  if (!should_notify_client_if_no_tasks_are_pending_)
+  // There's no need to call CheckForCompletedRasterTasks() if the client has
+  // already been notified.
+  if (!should_notify_client_if_no_tasks_in_set_are_pending_[task_set])
     return;
-  raster_finished_task_pending_ = false;
-
-  // Call CheckForCompletedRasterTasks() when we've finished running all
-  // raster tasks needed since last time ScheduleTasks() was called.
-  // This reduces latency between the time when all tasks have finished
-  // running and the time when the client is notified.
-  CheckForCompletedRasterTasks();
-}
-
-void PixelBufferRasterWorkerPool::OnRasterRequiredForActivationFinished() {
-  TRACE_EVENT0(
-      "cc",
-      "PixelBufferRasterWorkerPool::OnRasterRequiredForActivationFinished");
-
-  // Analogous to OnRasterTasksFinished(), there's no need to call
-  // CheckForCompletedRasterTasks() if the client has already been notified.
-  if (!should_notify_client_if_no_tasks_required_for_activation_are_pending_)
-    return;
-  raster_required_for_activation_finished_task_pending_ = false;
+  task_set_finished_tasks_pending_[task_set] = false;
 
   // This reduces latency between the time when all tasks required for
   // activation have finished running and the time when the client is
   // notified.
   CheckForCompletedRasterTasks();
 }
 
 void PixelBufferRasterWorkerPool::FlushUploads() {
   if (!has_performed_uploads_since_last_flush_)
     return;
@@ skipping 19 matching lines @@
 
     // Uploads complete in the order they are issued.
     if (!resource_provider_->DidSetPixelsComplete(task->resource()->id()))
       break;
 
     tasks_with_completed_uploads.push_back(task);
     raster_tasks_with_pending_upload_.pop_front();
   }
 
   DCHECK(client_);
+  TaskSetCollection task_sets_forced_to_complete =
+      client_->TasksThatShouldBeForcedToComplete();
   bool should_force_some_uploads_to_complete =
-      shutdown_ || client_->ShouldForceTasksRequiredForActivationToComplete();
+      shutdown_ || task_sets_forced_to_complete.any();
 
   if (should_force_some_uploads_to_complete) {
     RasterTask::Vector tasks_with_uploads_to_force;
     RasterTaskDeque::iterator it = raster_tasks_with_pending_upload_.begin();
     while (it != raster_tasks_with_pending_upload_.end()) {
       RasterTask* task = it->get();
       RasterTaskState::Vector::const_iterator state_it =
           std::find_if(raster_task_states_.begin(),
                        raster_task_states_.end(),
                        RasterTaskState::TaskComparator(task));
       DCHECK(state_it != raster_task_states_.end());
       const RasterTaskState& state = *state_it;
 
       // Force all uploads required for activation to complete.
       // During shutdown, force all pending uploads to complete.
-      if (shutdown_ || state.required_for_activation) {
+      if (shutdown_ || (state.task_sets & task_sets_forced_to_complete).any()) {
         tasks_with_uploads_to_force.push_back(task);
         tasks_with_completed_uploads.push_back(task);
         it = raster_tasks_with_pending_upload_.erase(it);
         continue;
       }
 
       ++it;
     }
 
     // Force uploads in reverse order. Since forcing can cause a wait on
@@ skipping 32 matching lines @@
     // Async set pixels commands are not necessarily processed in-sequence with
     // drawing commands. Read lock fences are required to ensure that async
     // commands don't access the resource while used for drawing.
     resource_provider_->EnableReadLockFences(task->resource()->id());
 
     DCHECK(std::find(completed_raster_tasks_.begin(),
                      completed_raster_tasks_.end(),
                      task) == completed_raster_tasks_.end());
     completed_raster_tasks_.push_back(task);
     state.type = RasterTaskState::COMPLETED;
-    DCHECK_LE(static_cast<size_t>(state.required_for_activation),
-              raster_tasks_required_for_activation_count_);
-    raster_tasks_required_for_activation_count_ -=
-        state.required_for_activation;
+    // Triggers if the current task belongs to a set that should be empty.
+    DCHECK((state.task_sets & ~task_set_sizes_.ToTaskSetCollection()).none());
+    task_set_sizes_ -= state.task_sets;
   }
 }
 
 void PixelBufferRasterWorkerPool::CheckForCompletedRasterTasks() {
   TRACE_EVENT0("cc",
                "PixelBufferRasterWorkerPool::CheckForCompletedRasterTasks");
 
   // Since this function can be called directly, cancel any pending checks.
   check_for_completed_raster_task_notifier_.Cancel();
 
-  DCHECK(should_notify_client_if_no_tasks_are_pending_);
+  DCHECK(should_notify_client_if_no_tasks_in_set_are_pending_.any());
 
   CheckForCompletedRasterizerTasks();
   CheckForCompletedUploads();
   FlushUploads();
 
   // Determine what client notifications to generate.
-  bool will_notify_client_that_no_tasks_required_for_activation_are_pending =
-      (should_notify_client_if_no_tasks_required_for_activation_are_pending_ &&
-       !raster_required_for_activation_finished_task_pending_ &&
-       !HasPendingTasksRequiredForActivation());
-  bool will_notify_client_that_no_tasks_are_pending =
-      (should_notify_client_if_no_tasks_are_pending_ &&
-       !raster_required_for_activation_finished_task_pending_ &&
-       !raster_finished_task_pending_ && !HasPendingTasks());
+  TaskSetCollection will_notify_client_that_no_tasks_in_set_are_pending =
+      should_notify_client_if_no_tasks_in_set_are_pending_ &
+      ~task_set_finished_tasks_pending_ & ~HasPendingTasksInSets();
 
   // Adjust the need to generate notifications before scheduling more tasks.
-  should_notify_client_if_no_tasks_required_for_activation_are_pending_ &=
-      !will_notify_client_that_no_tasks_required_for_activation_are_pending;
-  should_notify_client_if_no_tasks_are_pending_ &=
-      !will_notify_client_that_no_tasks_are_pending;
+  should_notify_client_if_no_tasks_in_set_are_pending_ &=
+      ~will_notify_client_that_no_tasks_in_set_are_pending;
 
   scheduled_raster_task_count_ = 0;
   if (PendingRasterTaskCount())
     ScheduleMoreTasks();
 
   TRACE_EVENT_ASYNC_STEP_INTO1(
       "cc", "ScheduledTasks", this, StateName(), "state", StateAsValue());
 
   // Schedule another check for completed raster tasks while there are
   // pending raster tasks or pending uploads.
-  if (HasPendingTasks())
+  if (HasPendingTasksInSets().any())
     check_for_completed_raster_task_notifier_.Schedule();
 
+  if (should_notify_client_if_no_tasks_in_set_are_pending_.none())
+    TRACE_EVENT_ASYNC_END0("cc", "ScheduledTasks", this);
+
   // Generate client notifications.
-  if (will_notify_client_that_no_tasks_required_for_activation_are_pending) {
-    DCHECK(!HasPendingTasksRequiredForActivation());
-    client_->DidFinishRunningTasksRequiredForActivation();
-  }
-  if (will_notify_client_that_no_tasks_are_pending) {
-    TRACE_EVENT_ASYNC_END0("cc", "ScheduledTasks", this);
-    DCHECK(!HasPendingTasksRequiredForActivation());
-    client_->DidFinishRunningTasks();
+  for (TaskSet task_set = 0; task_set < kNumberOfTaskSets; task_set++) {
+    if (will_notify_client_that_no_tasks_in_set_are_pending[task_set]) {
+      DCHECK(!HasPendingTasksInSets()[task_set]);
+      client_->DidFinishRunningTaskSet(task_set);
+    }
   }
 }
 
 void PixelBufferRasterWorkerPool::ScheduleMoreTasks() {
   TRACE_EVENT0("cc", "PixelBufferRasterWorkerPool::ScheduleMoreTasks");
 
   RasterTaskVector tasks;
-  RasterTaskVector tasks_required_for_activation;
+  RasterTaskVector tasks_in_set[kNumberOfTaskSets];
 
   unsigned priority = kRasterTaskPriorityBase;
 
   graph_.Reset();
 
   size_t bytes_pending_upload = bytes_pending_upload_;
-  bool did_throttle_raster_tasks = false;
-  bool did_throttle_raster_tasks_required_for_activation = false;
+  TaskSetCollection did_throttle_raster_tasks_in_set;
 
   for (RasterTaskQueue::Item::Vector::const_iterator it =
            raster_tasks_.items.begin();
        it != raster_tasks_.items.end();
        ++it) {
     const RasterTaskQueue::Item& item = *it;
     RasterTask* task = item.task;
 
     // |raster_task_states_| contains the state of all tasks that we have not
     // yet run reply callbacks for.
@@ skipping 14 matching lines @@
       continue;
     }
 
     // All raster tasks need to be throttled by bytes of pending uploads,
     // but if it's the only task allow it to complete no matter what its size,
     // to prevent starvation of the task queue.
     size_t new_bytes_pending_upload = bytes_pending_upload;
     new_bytes_pending_upload += task->resource()->bytes();
     if (new_bytes_pending_upload > max_bytes_pending_upload_ &&
         bytes_pending_upload) {
-      did_throttle_raster_tasks = true;
-      if (item.required_for_activation)
-        did_throttle_raster_tasks_required_for_activation = true;
+      did_throttle_raster_tasks_in_set |= item.task_sets;
       continue;
     }
 
     // If raster has finished, just update |bytes_pending_upload|.
     if (state.type == RasterTaskState::UPLOADING) {
       DCHECK(!task->HasCompleted());
       bytes_pending_upload = new_bytes_pending_upload;
       continue;
     }
 
     // Throttle raster tasks based on kMaxScheduledRasterTasks.
     if (tasks.container().size() >= kMaxScheduledRasterTasks) {
-      did_throttle_raster_tasks = true;
-      if (item.required_for_activation)
-        did_throttle_raster_tasks_required_for_activation = true;
+      did_throttle_raster_tasks_in_set |= item.task_sets;
       continue;
     }
 
     // Update |bytes_pending_upload| now that task has cleared all
     // throttling limits.
     bytes_pending_upload = new_bytes_pending_upload;
 
     DCHECK(state.type == RasterTaskState::UNSCHEDULED ||
            state.type == RasterTaskState::SCHEDULED);
     state.type = RasterTaskState::SCHEDULED;
 
     InsertNodesForRasterTask(&graph_, task, task->dependencies(), priority++);
 
     tasks.container().push_back(task);
-    if (item.required_for_activation)
-      tasks_required_for_activation.container().push_back(task);
+    for (TaskSet task_set = 0; task_set < kNumberOfTaskSets; task_set++) {
+      if (item.task_sets[task_set])
+        tasks_in_set[task_set].container().push_back(task);
+    }
   }
 
   // Cancel existing OnRasterFinished callbacks.
   raster_finished_weak_ptr_factory_.InvalidateWeakPtrs();
 
-  scoped_refptr<RasterizerTask>
-      new_raster_required_for_activation_finished_task;
+  scoped_refptr<RasterizerTask> new_task_set_finished_tasks[kNumberOfTaskSets];
+  TaskSetSizes scheduled_task_set_sizes;
 
-  size_t scheduled_raster_task_required_for_activation_count =
-      tasks_required_for_activation.container().size();
-  DCHECK_LE(scheduled_raster_task_required_for_activation_count,
-            raster_tasks_required_for_activation_count_);
-  // Schedule OnRasterTasksRequiredForActivationFinished call only when
-  // notification is pending and throttling is not preventing all pending
-  // tasks required for activation from being scheduled.
-  if (!did_throttle_raster_tasks_required_for_activation &&
-      should_notify_client_if_no_tasks_required_for_activation_are_pending_) {
-    new_raster_required_for_activation_finished_task =
-        CreateRasterRequiredForActivationFinishedTask(
-            raster_tasks_.required_for_activation_count,
-            task_runner_.get(),
-            base::Bind(&PixelBufferRasterWorkerPool::
-                           OnRasterRequiredForActivationFinished,
-                       raster_finished_weak_ptr_factory_.GetWeakPtr()));
-    raster_required_for_activation_finished_task_pending_ = true;
-    InsertNodeForTask(&graph_,
-                      new_raster_required_for_activation_finished_task.get(),
-                      kRasterRequiredForActivationFinishedTaskPriority,
-                      scheduled_raster_task_required_for_activation_count);
-    for (RasterTaskVector::ContainerType::const_iterator it =
-             tasks_required_for_activation.container().begin();
-         it != tasks_required_for_activation.container().end();
-         ++it) {
-      graph_.edges.push_back(TaskGraph::Edge(
-          *it, new_raster_required_for_activation_finished_task.get()));
+  for (TaskSet task_set = 0; task_set < kNumberOfTaskSets; task_set++) {
+    scheduled_task_set_sizes[task_set] =
+        tasks_in_set[task_set].container().size();
+    DCHECK_LE(scheduled_task_set_sizes[task_set], task_set_sizes_[task_set]);
+    // Schedule OnRasterTasksRequiredForActivationFinished call only when
+    // notification is pending and throttling is not preventing all pending
+    // tasks required for activation from being scheduled.
+    if (!did_throttle_raster_tasks_in_set[task_set] &&
+        should_notify_client_if_no_tasks_in_set_are_pending_[task_set]) {
+      base::debug::TraceEventSyntheticDelay* synthetic_delay = NULL;
+      if (scheduled_task_set_sizes[task_set] > 0)
+        synthetic_delay = client_->SyntheticDelayForTaskSet(task_set);
+      new_task_set_finished_tasks[task_set] = CreateRasterFinishedTask(
+          task_runner_.get(),
+          base::Bind(&PixelBufferRasterWorkerPool::OnRasterTaskSetFinished,
+                     raster_finished_weak_ptr_factory_.GetWeakPtr(),
+                     task_set),
+          synthetic_delay);
+      task_set_finished_tasks_pending_[task_set] = true;
+      InsertNodeForTask(&graph_,
+                        new_task_set_finished_tasks[task_set].get(),
+                        kRasterTaskSetFinishedTaskPriority,
+                        scheduled_task_set_sizes[task_set]);
+      for (RasterTaskVector::ContainerType::const_iterator it =
+               tasks_in_set[task_set].container().begin();
+           it != tasks_in_set[task_set].container().end();
+           ++it) {
+        graph_.edges.push_back(
+            TaskGraph::Edge(*it, new_task_set_finished_tasks[task_set].get()));
+      }
     }
   }
 
-  scoped_refptr<RasterizerTask> new_raster_finished_task;
-
   size_t scheduled_raster_task_count = tasks.container().size();
   DCHECK_LE(scheduled_raster_task_count, PendingRasterTaskCount());
-  // Schedule OnRasterTasksFinished call only when notification is pending
-  // and throttling is not preventing all pending tasks from being scheduled.
-  if (!did_throttle_raster_tasks &&
-      should_notify_client_if_no_tasks_are_pending_) {
-    new_raster_finished_task = CreateRasterFinishedTask(
-        task_runner_.get(),
-        base::Bind(&PixelBufferRasterWorkerPool::OnRasterFinished,
-                   raster_finished_weak_ptr_factory_.GetWeakPtr()));
-    raster_finished_task_pending_ = true;
-    InsertNodeForTask(&graph_,
-                      new_raster_finished_task.get(),
-                      kRasterFinishedTaskPriority,
-                      scheduled_raster_task_count);
-    for (RasterTaskVector::ContainerType::const_iterator it =
-             tasks.container().begin();
-         it != tasks.container().end();
-         ++it) {
-      graph_.edges.push_back(
-          TaskGraph::Edge(*it, new_raster_finished_task.get()));
-    }
-  }
 
   ScheduleTasksOnOriginThread(this, &graph_);
   task_graph_runner_->ScheduleTasks(namespace_token_, &graph_);
 
   scheduled_raster_task_count_ = scheduled_raster_task_count;
 
-  raster_finished_task_ = new_raster_finished_task;
-  raster_required_for_activation_finished_task_ =
-      new_raster_required_for_activation_finished_task;
+  for (TaskSet task_set = 0; task_set < kNumberOfTaskSets; task_set++)
+    task_set_finished_tasks_[task_set] = new_task_set_finished_tasks[task_set];
 }
 
 unsigned PixelBufferRasterWorkerPool::PendingRasterTaskCount() const {
   unsigned num_completed_raster_tasks =
       raster_tasks_with_pending_upload_.size() + completed_raster_tasks_.size();
   DCHECK_GE(raster_task_states_.size(), num_completed_raster_tasks);
   return raster_task_states_.size() - num_completed_raster_tasks;
 }
 
-bool PixelBufferRasterWorkerPool::HasPendingTasks() const {
-  return PendingRasterTaskCount() || !raster_tasks_with_pending_upload_.empty();
-}
-
-bool PixelBufferRasterWorkerPool::HasPendingTasksRequiredForActivation() const {
-  return !!raster_tasks_required_for_activation_count_;
+TaskSetCollection PixelBufferRasterWorkerPool::HasPendingTasksInSets() const {
+  return task_set_sizes_.ToTaskSetCollection();
 }
 
 const char* PixelBufferRasterWorkerPool::StateName() const {
   if (scheduled_raster_task_count_)
     return "rasterizing";
   if (PendingRasterTaskCount())
     return "throttled";
   if (!raster_tasks_with_pending_upload_.empty())
     return "waiting_for_uploads";
 
@@ skipping 45 matching lines @@
       if (item_it != raster_tasks_.items.end()) {
         state.type = RasterTaskState::UNSCHEDULED;
         continue;
       }
 
       DCHECK(std::find(completed_raster_tasks_.begin(),
                        completed_raster_tasks_.end(),
                        raster_task) == completed_raster_tasks_.end());
       completed_raster_tasks_.push_back(raster_task);
       state.type = RasterTaskState::COMPLETED;
-      DCHECK_LE(static_cast<size_t>(state.required_for_activation),
-                raster_tasks_required_for_activation_count_);
-      raster_tasks_required_for_activation_count_ -=
-          state.required_for_activation;
+      // Triggers if the current task belongs to a set that should be empty.
+      DCHECK((state.task_sets & ~task_set_sizes_.ToTaskSetCollection()).none());
+      task_set_sizes_ -= state.task_sets;
       continue;
     }
 
     resource_provider_->BeginSetPixels(raster_task->resource()->id());
     has_performed_uploads_since_last_flush_ = true;
 
     bytes_pending_upload_ += raster_task->resource()->bytes();
     raster_tasks_with_pending_upload_.push_back(raster_task);
     state.type = RasterTaskState::UPLOADING;
   }
   completed_tasks_.clear();
 }
 
 scoped_refptr<base::debug::ConvertableToTraceFormat>
 PixelBufferRasterWorkerPool::StateAsValue() const {
   scoped_refptr<base::debug::TracedValue> state =
       new base::debug::TracedValue();
   state->SetInteger("completed_count", completed_raster_tasks_.size());
   state->SetInteger("pending_count", raster_task_states_.size());
   state->SetInteger("pending_upload_count",
                     raster_tasks_with_pending_upload_.size());
-  state->SetInteger("pending_required_for_activation_count",
-                    raster_tasks_required_for_activation_count_);
+  for (TaskSet task_set = 0; task_set < kNumberOfTaskSets; task_set++) {
+    state->SetInteger(
+        base::StringPrintf("pending_task_in_set_%u",
+                           static_cast<unsigned>(task_set)).c_str(),
+        task_set_sizes_[task_set]);
+  }
   state->BeginDictionary("throttle_state");
   ThrottleStateAsValueInto(state.get());
   state->EndDictionary();
   return state;
 }
 
 void PixelBufferRasterWorkerPool::ThrottleStateAsValueInto(
     base::debug::TracedValue* throttle_state) const {
   throttle_state->SetInteger("bytes_available_for_upload",
                              max_bytes_pending_upload_ - bytes_pending_upload_);
   throttle_state->SetInteger("bytes_pending_upload", bytes_pending_upload_);
   throttle_state->SetInteger("scheduled_raster_task_count",
                              scheduled_raster_task_count_);
 }
 
 }  // namespace cc