Add ProcessPowerCollector to audit power information.

chrome/browser/power/process_power_collector.cc

Index: chrome/browser/power/process_power_collector.cc
diff --git a/chrome/browser/power/process_power_collector.cc b/chrome/browser/power/process_power_collector.cc
new file mode 100644
index 0000000000000000000000000000000000000000..bb4b6a6747c2f3579270403a2babe2d5d8688c9f
--- /dev/null
+++ b/chrome/browser/power/process_power_collector.cc
@@ -0,0 +1,209 @@
+// 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 "chrome/browser/power/process_power_collector.h"
+
+#include "apps/app_window.h"
+#include "apps/app_window_registry.h"
+#include "base/process/process_handle.h"
+#include "base/process/process_metrics.h"
+#include "chrome/browser/browser_process.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/profiles/profile_manager.h"
+#include "chrome/browser/ui/tab_contents/tab_contents_iterator.h"
+#include "components/power/origin_power_map.h"
+#include "components/power/origin_power_map_factory.h"
+#include "content/public/browser/browser_context.h"
+#include "content/public/browser/render_process_host.h"
+#include "content/public/browser/web_contents.h"
+#include "url/gurl.h"
+
+#if defined(OS_CHROMEOS)
+#include "chromeos/dbus/dbus_thread_manager.h"
+#include "chromeos/dbus/power_manager/power_supply_properties.pb.h"
+#endif
+
+namespace {
+const int kSecondsPerSample = 30;
+}
+
+ProcessPowerCollector::PerProcessData::PerProcessData(
+    scoped_ptr<base::ProcessMetrics> metrics,
+    const GURL& origin,
+    Profile* profile)
+    : metrics_(metrics.Pass()),
+      profile_(profile),
+      last_origin_(origin),
+      last_cpu_percent_(0),
+      seen_this_cycle_(true) {
+}
+
+ProcessPowerCollector::PerProcessData::PerProcessData() {
+}
+
+ProcessPowerCollector::PerProcessData::~PerProcessData() {
+}
+
+ProcessPowerCollector::ProcessPowerCollector()
+#if defined(OS_CHROMEOS)
+    : should_update_(false),
+      battery_discharge_rate_(0.0)
+#endif
+{
+}
+
+ProcessPowerCollector::~ProcessPowerCollector() {
+}
+
+void ProcessPowerCollector::Initialize() {
+  DCHECK(!timer_.IsRunning());
+#if defined(OS_CHROMEOS)
+  chromeos::DBusThreadManager::Get()->GetPowerManagerClient()->AddObserver(
+      this);
+#endif
+  timer_.Start(FROM_HERE,
+               base::TimeDelta::FromSeconds(kSecondsPerSample),
+               this,
+               &ProcessPowerCollector::HandleUpdateTimeout);
+}
+
+void ProcessPowerCollector::Shutdown() {
+#if defined(OS_CHROMEOS)
+  chromeos::DBusThreadManager* dbus_manager =
+      chromeos::DBusThreadManager::Get();
+  dbus_manager->GetPowerManagerClient()->RemoveObserver(this);
+#endif
+}
+
+#if defined(OS_CHROMEOS)
+void ProcessPowerCollector::PowerChanged(
+    const power_manager::PowerSupplyProperties& prop) {
+  if (prop.battery_state() ==
+      power_manager::PowerSupplyProperties::DISCHARGING) {
+    should_update_ = true;
+    battery_discharge_rate_ = prop.battery_discharge_rate();
+  } else {
+    should_update_ = false;
+    battery_discharge_rate_ = 0.0;
+  }
+}
+#endif
+
+double ProcessPowerCollector::SynchronizeProcesses() {
+  // Update all tabs.
+  for (TabContentsIterator it; !it.done(); it.Next()) {
+    content::RenderProcessHost* render_process = it->GetRenderProcessHost();
+    // Skip incognito web contents.
+    if (render_process->GetBrowserContext()->IsOffTheRecord())
+      continue;
+    UpdateProcessInMap(render_process, it->GetLastCommittedURL().GetOrigin());
+  }
+
+  // Iterate over all profiles to find all app windows to attribute all apps.
+  ProfileManager* pm = g_browser_process->profile_manager();
+  std::vector<Profile*> open_profiles = pm->GetLoadedProfiles();
+  for (std::vector<Profile*>::const_iterator it = open_profiles.begin();
+       it != open_profiles.end();
+       ++it) {
+    const apps::AppWindowRegistry::AppWindowList& app_windows =
+        apps::AppWindowRegistry::Get(*it)->app_windows();
+    for (apps::AppWindowRegistry::AppWindowList::const_iterator itr =
+             app_windows.begin();
+         itr != app_windows.end();
+         ++itr) {
+      content::WebContents* web_contents = (*itr)->web_contents();
+
+      UpdateProcessInMap(web_contents->GetRenderProcessHost(),
+                         web_contents->GetLastCommittedURL().GetOrigin());
+    }
+  }
+
+  // Remove invalid processes and sum up the cpu cycle.
+  double total_cpu_percent = 0.0;
+  ProcessMetricsMap::iterator it = metrics_map_.begin();
+  while (it != metrics_map_.end()) {
+    if (!it->second->seen_this_cycle()) {
+      metrics_map_.erase(it++);
+      continue;
+    }
+
+    total_cpu_percent += it->second->last_cpu_percent();
+    it++;
+  }
+
+  return total_cpu_percent;
+}
+
+void ProcessPowerCollector::RecordCpuUsageByOrigin(double total_cpu_percent) {
+  if (total_cpu_percent <= 0)
+    return;
+
+#if defined(OS_CHROMEOS)
+  if (!should_update_)
+    return;
+#endif
+
+  for (ProcessMetricsMap::iterator it = metrics_map_.begin();
+       it != metrics_map_.end();
+       ++it) {
+    double last_process_power_usage = it->second->last_cpu_percent();
+#if defined(OS_CHROMEOS)
+    // Chrome OS scales by battery discharge rate.
+    last_process_power_usage *= battery_discharge_rate_ / total_cpu_percent;
+#endif
+
+    GURL origin = it->second->last_origin();
+    power::OriginPowerMap* origin_power_map =
+        power::OriginPowerMapFactory::GetForBrowserContext(
+            it->second->profile());
+    DCHECK(origin_power_map);
+    origin_power_map->AddPowerForOrigin(origin, last_process_power_usage);
+
+    // Invalidate |last_cpu| for the next cycle.
+    it->second->set_seen_this_cycle(false);
+  }
+}
+
+void ProcessPowerCollector::UpdateProcessInMap(
+    const content::RenderProcessHost* rph,
+    const GURL& origin) {
+  base::ProcessHandle handle = rph->GetHandle();
+  if (metrics_map_.find(handle) == metrics_map_.end()) {
+    metrics_map_[handle] = linked_ptr<PerProcessData>(new PerProcessData(
+#if defined(OS_MACOSX)
+        scoped_ptr<base::ProcessMetrics>(
+            base::ProcessMetrics::CreateProcessMetrics(handle, NULL)),
+#else
+        scoped_ptr<base::ProcessMetrics>(
+            base::ProcessMetrics::CreateProcessMetrics(handle)),
+#endif
+        origin,
+        Profile::FromBrowserContext(rph->GetBrowserContext())));
+  }
+
+  linked_ptr<PerProcessData>& process_data = metrics_map_[handle];
+  if (cpu_usage_callback_.is_null())
+    process_data->set_last_cpu_percent(process_data->metrics()->GetCPUUsage());
+  else
+    process_data->set_last_cpu_percent(cpu_usage_callback_.Run(handle));
+
+  // Skip errors.
+  if (process_data->last_cpu_percent() < 0) {
+    process_data->set_last_cpu_percent(0);
+  }
+  process_data->set_seen_this_cycle(true);
+}
+
+double ProcessPowerCollector::UpdatePowerConsumptionForTesting() {
+  return UpdatePowerConsumption();
+}
+
+double ProcessPowerCollector::UpdatePowerConsumption() {
+  double total_cpu_percent = SynchronizeProcesses();
+  RecordCpuUsageByOrigin(total_cpu_percent);
+  return total_cpu_percent;
+}
+
+void ProcessPowerCollector::HandleUpdateTimeout() {
+  UpdatePowerConsumption();
+}