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

content/browser/power_profiler/power_profiler_service.cc

 // Copyright 2014 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 "content/browser/power_profiler/power_profiler_service.h"
 
 #include "base/bind.h"
 #include "base/message_loop/message_loop.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "content/public/browser/browser_thread.h"
@@ skipping 24 matching lines @@
       data_provider_(provider.Pass()) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
   if (data_provider_.get())
       status_ = INITIALIZED;
 }
 
 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();
 }
 
 void PowerProfilerService::AddObserver(PowerProfilerObserver* observer) {
   if (status_ == UNINITIALIZED)
     return;
 
   observers_.AddObserver(observer);
   if (status_ != PROFILING)
@@ skipping 41 matching lines @@
 
   // Get data and notify.
   PowerEventVector events = data_provider_->GetData();
   if (events.size() != 0) {
     BrowserThread::PostTask(BrowserThread::UI, FROM_HERE, base::Bind(
         &PowerProfilerService::Notify, base::Unretained(this), events));
   }
 }
 
 }  // namespace content