NOCOMMIT PROTOTYPE [GRC] Tab CPU Usage Observer

services/resource_coordinator/coordination_unit/process_coordination_unit_impl.cc

Index: services/resource_coordinator/coordination_unit/process_coordination_unit_impl.cc
diff --git a/services/resource_coordinator/coordination_unit/process_coordination_unit_impl.cc b/services/resource_coordinator/coordination_unit/process_coordination_unit_impl.cc
index 0bc6d1ab9088b4ddbb7e79e2aae23d4fe3991750..5dc448887369521f2a946fad0c53b78451bdfb06 100644
--- a/services/resource_coordinator/coordination_unit/process_coordination_unit_impl.cc
+++ b/services/resource_coordinator/coordination_unit/process_coordination_unit_impl.cc
@@ -37,7 +37,7 @@ const int kCPUProfilingIntervalInSeconds = 5;
 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)
@@ -63,15 +63,12 @@ ProcessCoordinationUnitImpl::ProcessCoordinationUnitImpl(
 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