[Chromium] [PowerProfiler] Support accuracy level attribute for power data provider.

content/browser/power_profiler/power_profiler_service.cc

Index: content/browser/power_profiler/power_profiler_service.cc
diff --git a/content/browser/power_profiler/power_profiler_service.cc b/content/browser/power_profiler/power_profiler_service.cc
index 951034c3918125a81e45b7f18ab92bb12ea33596..03bb6ca79914322fbeb056a299f4c772b878975f 100644
--- a/content/browser/power_profiler/power_profiler_service.cc
+++ b/content/browser/power_profiler/power_profiler_service.cc
@@ -42,10 +42,23 @@ PowerProfilerService::PowerProfilerService(
 PowerProfilerService::~PowerProfilerService() {
 }
 
-bool PowerProfilerService::IsAvailable() {
+bool PowerProfilerService::IsAvailable() const {
   return status_ !=  UNINITIALIZED;
 }
 
+std::string PowerProfilerService::AccuracyLevel() const {
+  DCHECK(IsAvailable());
+  switch (data_provider_->GetAccuracyLevel()) {
+    case PowerDataProvider::High:
+      return "High";
+    case PowerDataProvider::Medium:
+      return "Medium";
+    case PowerDataProvider::Low:
+      return "Low";
+  }
+  return "";
+}
+
 PowerProfilerService* PowerProfilerService::GetInstance() {
   return Singleton<PowerProfilerService>::get();
 }