Plugin Power Saver: Make PepperPluginInstanceThrottler interface public.

content/public/renderer/plugin_instance_throttler.cc

 // 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.
 
-#ifndef COMPONENTS_HISTORY_CONTENT_BROWSER_HISTORY_CONTEXT_HELPER_H_
-#define COMPONENTS_HISTORY_CONTENT_BROWSER_HISTORY_CONTEXT_HELPER_H_
+#include "content/public/renderer/plugin_instance_throttler.h"
 
-#include "components/history/core/browser/history_context.h"
+#include "content/renderer/pepper/plugin_instance_throttler_impl.h"
 
 namespace content {
-class WebContents;
+
+// static
+scoped_ptr<PluginInstanceThrottler> PluginInstanceThrottler::Get(
+    RenderFrame* frame,
+    const GURL& plugin_url,
+    PluginPowerSaverMode power_saver_mode) {
+  if (power_saver_mode == PluginPowerSaverMode::POWER_SAVER_MODE_ESSENTIAL)
+    return nullptr;
+
+  bool power_saver_enabled =
+      power_saver_mode ==
+      PluginPowerSaverMode::POWER_SAVER_MODE_PERIPHERAL_THROTTLED;
+  return make_scoped_ptr(
+      new PluginInstanceThrottlerImpl(frame, plugin_url, power_saver_enabled));
+}
+
 }  // namespace content
-
-namespace history {
-
-// Helper function that associates a ContextID to a content::WebContents. The
-// ContextID will become invalid once the content::WebContents is destroyed.
-ContextID ContextIDForWebContents(content::WebContents* web_contents);
-
-}  // namespace history
-
-#endif  // COMPONENTS_HISTORY_CONTENT_BROWSER_HISTORY_CONTEXT_HELPER_H_