Revert of Plugin Power Saver: Improve Poster behavior for essential plugins.

chrome/renderer/plugins/power_saver_info.cc

Index: chrome/renderer/plugins/power_saver_info.cc
diff --git a/chrome/renderer/plugins/power_saver_info.cc b/chrome/renderer/plugins/power_saver_info.cc
deleted file mode 100644
index 600a29c123cafad2486501efb1451be1c29b880d..0000000000000000000000000000000000000000
--- a/chrome/renderer/plugins/power_saver_info.cc
+++ /dev/null
@@ -1,124 +0,0 @@
-// Copyright 2015 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 "base/command_line.h"
-#include "base/metrics/histogram_macros.h"
-#include "base/strings/utf_string_conversions.h"
-#include "chrome/renderer/plugins/power_saver_info.h"
-#include "content/public/common/content_constants.h"
-#include "content/public/common/content_switches.h"
-#include "content/public/common/webplugininfo.h"
-#include "content/public/renderer/render_frame.h"
-#include "third_party/WebKit/public/platform/WebSecurityOrigin.h"
-#include "third_party/WebKit/public/web/WebLocalFrame.h"
-#include "third_party/WebKit/public/web/WebPluginParams.h"
-#include "url/origin.h"
-
-namespace {
-
-// Presence of the poster param within plugin object tags.
-// These numeric values are used in UMA logs; do not change them.
-enum PosterParamPresence {
-  POSTER_PRESENCE_NO_PARAM_PPS_DISABLED = 0,
-  POSTER_PRESENCE_NO_PARAM_PPS_ENABLED = 1,
-  POSTER_PRESENCE_PARAM_EXISTS_PPS_DISABLED = 2,
-  POSTER_PRESENCE_PARAM_EXISTS_PPS_ENABLED = 3,
-  POSTER_PRESENCE_NUM_ITEMS
-};
-
-const char kPluginPowerSaverPosterParamPresenceHistogram[] =
-    "Plugin.PowerSaver.PosterParamPresence";
-
-void RecordPosterParamPresence(PosterParamPresence presence) {
-  UMA_HISTOGRAM_ENUMERATION(kPluginPowerSaverPosterParamPresenceHistogram,
-                            presence, POSTER_PRESENCE_NUM_ITEMS);
-}
-
-void TrackPosterParamPresence(const blink::WebPluginParams& params,
-                              bool power_saver_enabled) {
-  DCHECK_EQ(params.attributeNames.size(), params.attributeValues.size());
-
-  for (size_t i = 0; i < params.attributeNames.size(); ++i) {
-    if (params.attributeNames[i].utf8() == "poster") {
-      RecordPosterParamPresence(
-          power_saver_enabled ? POSTER_PRESENCE_PARAM_EXISTS_PPS_ENABLED
-                              : POSTER_PRESENCE_PARAM_EXISTS_PPS_DISABLED);
-      return;
-    }
-  }
-
-  RecordPosterParamPresence(power_saver_enabled
-                                ? POSTER_PRESENCE_NO_PARAM_PPS_ENABLED
-                                : POSTER_PRESENCE_NO_PARAM_PPS_DISABLED);
-}
-
-std::string GetPluginInstancePosterAttribute(
-    const blink::WebPluginParams& params) {
-  DCHECK_EQ(params.attributeNames.size(), params.attributeValues.size());
-
-  for (size_t i = 0; i < params.attributeNames.size(); ++i) {
-    if (params.attributeNames[i].utf8() == "poster" &&
-        !params.attributeValues[i].isEmpty()) {
-      return params.attributeValues[i].utf8();
-    }
-  }
-  return std::string();
-}
-
-}  // namespace
-
-PowerSaverInfo::PowerSaverInfo()
-    : power_saver_enabled(false), blocked_for_background_tab(false) {}
-
-PowerSaverInfo PowerSaverInfo::Get(content::RenderFrame* render_frame,
-                                   bool power_saver_setting_on,
-                                   const blink::WebPluginParams& params,
-                                   const content::WebPluginInfo& plugin_info,
-                                   const GURL& document_url) {
-  base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
-  std::string override_for_testing = command_line->GetSwitchValueASCII(
-      switches::kOverridePluginPowerSaverForTesting);
-
-  // This feature has only been tested thoroughly with Flash thus far.
-  // It is also enabled for the Power Saver test plugin for browser tests.
-  bool is_flash =
-      plugin_info.name == base::ASCIIToUTF16(content::kFlashPluginName);
-  bool can_throttle_plugin_type =
-      is_flash || override_for_testing == "ignore-list";
-
-  PowerSaverInfo info;
-  info.power_saver_enabled =
-      override_for_testing == "always" ||
-      (power_saver_setting_on && can_throttle_plugin_type);
-
-  if (info.power_saver_enabled) {
-    // Even if we disable PPS in the next block because content is same-origin,
-    // it should still be eligible for background tab deferral if PPS is on.
-    info.blocked_for_background_tab = render_frame->IsHidden();
-
-    auto status = render_frame->GetPeripheralContentStatus(
-        render_frame->GetWebFrame()->top()->securityOrigin(),
-        url::Origin(params.url), gfx::Size());
-
-    // Early-exit from the whole Power Saver system if the content is
-    // same-origin or whitelisted-origin. We ignore the other possibilities,
-    // because we don't know the unobscured size of the plugin content yet.
-    //
-    // Once the plugin is loaded, the peripheral content status is re-tested
-    // with the actual unobscured plugin size.
-    if (status == content::RenderFrame::CONTENT_STATUS_ESSENTIAL_SAME_ORIGIN ||
-        status == content::RenderFrame::
-                      CONTENT_STATUS_ESSENTIAL_CROSS_ORIGIN_WHITELISTED) {
-      info.power_saver_enabled = false;
-    } else {
-      info.poster_attribute = GetPluginInstancePosterAttribute(params);
-      info.base_url = document_url;
-    }
-  }
-
-  if (is_flash)
-    TrackPosterParamPresence(params, info.power_saver_enabled);
-
-  return info;
-}