Plugin Power Saver: Record PPS UMAs only for users with PPS enabled.

content/renderer/pepper/plugin_instance_throttler_impl.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/renderer/pepper/plugin_instance_throttler_impl.h"
 
 #include "base/metrics/histogram.h"
 #include "base/time/time.h"
 #include "content/public/common/content_constants.h"
 #include "content/public/renderer/render_thread.h"
@@ skipping 19 matching lines @@
 // video frames. We use this timeout to prevent waiting forever for a good
 // poster image. Chosen arbitrarily.
 const int kAudioThrottledFrameTimeoutMilliseconds = 500;
 
 }  // namespace
 
 // static
 const int PluginInstanceThrottlerImpl::kMaximumFramesToExamine = 150;
 
 // static
-scoped_ptr<PluginInstanceThrottler> PluginInstanceThrottler::Create(
-    bool power_saver_enabled) {
-  return make_scoped_ptr(new PluginInstanceThrottlerImpl(power_saver_enabled));
+scoped_ptr<PluginInstanceThrottler> PluginInstanceThrottler::Create() {
+  return make_scoped_ptr(new PluginInstanceThrottlerImpl);
 }
 
 // static
 void PluginInstanceThrottler::RecordUnthrottleMethodMetric(
     PluginInstanceThrottlerImpl::PowerSaverUnthrottleMethod method) {
   UMA_HISTOGRAM_ENUMERATION(
       "Plugin.PowerSaver.Unthrottle", method,
       PluginInstanceThrottler::UNTHROTTLE_METHOD_NUM_ITEMS);
 }
 
-PluginInstanceThrottlerImpl::PluginInstanceThrottlerImpl(
-    bool power_saver_enabled)
-    : state_(power_saver_enabled ? THROTTLER_STATE_AWAITING_KEYFRAME
-                                 : THROTTLER_STATE_POWER_SAVER_DISABLED),
+PluginInstanceThrottlerImpl::PluginInstanceThrottlerImpl()
+    : state_(THROTTLER_STATE_AWAITING_KEYFRAME),
       is_hidden_for_placeholder_(false),
       web_plugin_(nullptr),
       consecutive_interesting_frames_(0),
       frames_examined_(0),
       audio_throttled_(false),
       audio_throttled_frame_timeout_(
           FROM_HERE,
           base::TimeDelta::FromMilliseconds(
               kAudioThrottledFrameTimeoutMilliseconds),
           this,
@@ skipping 140 matching lines @@
 
     // Release our reference to the underlying pixel data.
     last_received_frame_.reset();
   }
 
   state_ = THROTTLER_STATE_PLUGIN_THROTTLED;
   FOR_EACH_OBSERVER(Observer, observer_list_, OnThrottleStateChange());
 }
 
 }  // namespace content