NOCOMMIT PROTOTYPE [GRC] Tab CPU Usage Observer

services/resource_coordinator/coordination_unit/process_coordination_unit_impl.cc

 // Copyright 2017 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 "services/resource_coordinator/coordination_unit/process_coordination_unit_impl.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/process/process.h"
@@ skipping 19 matching lines @@
 
 namespace {
 
 const int kCPUProfilingIntervalInSeconds = 5;
 
 }  // namespace
 
 ProcessCoordinationUnitImpl::ProcessCoordinationUnitImpl(
     const CoordinationUnitID& id,
     std::unique_ptr<service_manager::ServiceContextRef> service_ref)
-    : CoordinationUnitImpl(id, std::move(service_ref)), cpu_usage_(-1.0) {
+    : CoordinationUnitImpl(id, std::move(service_ref)) {
   // ProcessCoordinationUnit ids should correspond to its pid
   base::ProcessId pid = id.id;
 #if defined(OS_WIN)
   base::Process process =
       base::Process::OpenWithAccess(pid, PROCESS_QUERY_INFORMATION);
 #else
   base::Process process = base::Process::Open(pid);
 #endif
   base::ProcessHandle process_handle = process.Handle();
 
 #if defined(OS_MACOSX)
   process_metrics_ = base::ProcessMetrics::CreateProcessMetrics(
       process_handle,
       service_manager::MachBroker::GetInstance()->port_provider());
 #else
   process_metrics_ = base::ProcessMetrics::CreateProcessMetrics(process_handle);
 #endif
 
   repeating_timer_.Start(FROM_HERE, base::TimeDelta(), this,
                          &ProcessCoordinationUnitImpl::MeasureProcessCPUUsage);
 }
 
 ProcessCoordinationUnitImpl::~ProcessCoordinationUnitImpl() = default;
 
 void ProcessCoordinationUnitImpl::MeasureProcessCPUUsage() {
-  cpu_usage_ = process_metrics_->GetPlatformIndependentCPUUsage();
+  double cpu_usage = process_metrics_->GetPlatformIndependentCPUUsage();
+  SetProperty(mojom::PropertyType::kProcessCPUUsage, base::Value(cpu_usage));
 
   repeating_timer_.Start(
       FROM_HERE, base::TimeDelta::FromSeconds(kCPUProfilingIntervalInSeconds),
       this, &ProcessCoordinationUnitImpl::MeasureProcessCPUUsage);
 }
 
-double ProcessCoordinationUnitImpl::GetCPUUsageForTesting() {
-  return cpu_usage_;
-}
-
 }  // namespace resource_coordinator