gpu: Implement idle async pixel transfers.

gpu/command_buffer/service/gpu_scheduler.cc

 // Copyright (c) 2012 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 "gpu/command_buffer/service/gpu_scheduler.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/debug/trace_event.h"
@@ skipping 150 matching lines @@
     }
   }
 }
 
 bool GpuScheduler::IsScheduled() {
   return unscheduled_count_ == 0;
 }
 
 bool GpuScheduler::HasMoreWork() {
   return !unschedule_fences_.empty() ||
-         (decoder_ && decoder_->ProcessPendingQueries());
+         (decoder_ && decoder_->ProcessPendingQueries()) ||
+         HasMoreIdleWork();
 }
 
 void GpuScheduler::SetSchedulingChangedCallback(
     const SchedulingChangedCallback& callback) {
   scheduling_changed_callback_ = callback;
 }
 
 Buffer GpuScheduler::GetSharedMemoryBuffer(int32 shm_id) {
   return command_buffer_->GetTransferBuffer(shm_id);
 }
@@ skipping 80 matching lines @@
     TRACE_COUNTER_ID1("gpu", "GpuScheduler::Preempted", this, 1);
     was_preempted_ = true;
   } else if (was_preempted_ && !preemption_flag_->IsSet()) {
     TRACE_COUNTER_ID1("gpu", "GpuScheduler::Preempted", this, 0);
     was_preempted_ = false;
   }
 
   return preemption_flag_->IsSet();
 }
 
+bool GpuScheduler::HasMoreIdleWork() {
+  return (decoder_ && decoder_->HasMoreIdleWork());
+}
+
+void GpuScheduler::PerformIdleWork() {
+  if (!decoder_)
+    return;
+  decoder_->PerformIdleWork();
+}
+
 void GpuScheduler::RescheduleTimeOut() {
   int new_count = unscheduled_count_ + rescheduled_count_;
 
   rescheduled_count_ = 0;
 
   while (unscheduled_count_)
     SetScheduled(true);
 
   rescheduled_count_ = new_count;
 }
 
 GpuScheduler::UnscheduleFence::UnscheduleFence(
     gfx::GLFence* fence_, base::Closure task_): fence(fence_), task(task_) {
 }
 
 GpuScheduler::UnscheduleFence::~UnscheduleFence() {
 }
 
 }  // namespace gpu