Flash: Use better APIs for preventing sleep

chrome/browser/renderer_host/pepper/pepper_flash_browser_host.cc

 // Copyright (c) 2012 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/renderer_host/pepper/pepper_flash_browser_host.h"
 
 #include "base/time/time.h"
 #include "build/build_config.h"
 #include "chrome/browser/content_settings/cookie_settings_factory.h"
 #include "chrome/browser/profiles/profile.h"
 #include "components/content_settings/core/browser/cookie_settings.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/browser_ppapi_host.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/render_process_host.h"
+#include "device/power_save_blocker/power_save_blocker.h"
 #include "ipc/ipc_message_macros.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/c/private/ppb_flash.h"
 #include "ppapi/host/dispatch_host_message.h"
 #include "ppapi/proxy/ppapi_messages.h"
 #include "ppapi/proxy/resource_message_params.h"
 #include "ppapi/shared_impl/time_conversion.h"
 #include "url/gurl.h"
 
 #if defined(OS_WIN)
@@ skipping 24 matching lines @@
   return NULL;
 }
 
 }  // namespace
 
 PepperFlashBrowserHost::PepperFlashBrowserHost(BrowserPpapiHost* host,
                                                PP_Instance instance,
                                                PP_Resource resource)
     : ResourceHost(host->GetPpapiHost(), instance, resource),
       host_(host),
+      delay_timer_(FROM_HERE, base::TimeDelta::FromSeconds(45), this,
+                   &PepperFlashBrowserHost::OnDelayTimerFired),
       weak_factory_(this) {
   int unused;
   host->GetRenderFrameIDsForInstance(instance, &render_process_id_, &unused);
 }
 
 PepperFlashBrowserHost::~PepperFlashBrowserHost() {}
 
 int32_t PepperFlashBrowserHost::OnResourceMessageReceived(
     const IPC::Message& msg,
     ppapi::host::HostMessageContext* context) {
   PPAPI_BEGIN_MESSAGE_MAP(PepperFlashBrowserHost, msg)
     PPAPI_DISPATCH_HOST_RESOURCE_CALL_0(PpapiHostMsg_Flash_UpdateActivity,
                                         OnUpdateActivity)
     PPAPI_DISPATCH_HOST_RESOURCE_CALL(PpapiHostMsg_Flash_GetLocalTimeZoneOffset,
                                       OnGetLocalTimeZoneOffset)
     PPAPI_DISPATCH_HOST_RESOURCE_CALL_0(
         PpapiHostMsg_Flash_GetLocalDataRestrictions, OnGetLocalDataRestrictions)
   PPAPI_END_MESSAGE_MAP()
   return PP_ERROR_FAILED;
 }
 
+void PepperFlashBrowserHost::OnDelayTimerFired() {
+  power_save_blocker_.reset();
+}
+
 int32_t PepperFlashBrowserHost::OnUpdateActivity(
     ppapi::host::HostMessageContext* host_context) {
-#if defined(OS_WIN)
-  // Reading then writing back the same value to the screensaver timeout system
-  // setting resets the countdown which prevents the screensaver from turning
-  // on "for a while". As long as the plugin pings us with this message faster
-  // than the screensaver timeout, it won't go on.
-  int value = 0;
-  if (SystemParametersInfo(SPI_GETSCREENSAVETIMEOUT, 0, &value, 0))
-    SystemParametersInfo(SPI_SETSCREENSAVETIMEOUT, value, NULL, 0);
-#elif defined(OS_MACOSX)
-  UpdateSystemActivity(OverallAct);
-#else
-// TODO(brettw) implement this for other platforms.
-#endif
+  if (!power_save_blocker_) {
+    power_save_blocker_.reset(new device::PowerSaveBlocker(
+        device::PowerSaveBlocker::kPowerSaveBlockPreventAppSuspension,
+        device::PowerSaveBlocker::kReasonOther, "Requested By PepperFlash",
+        BrowserThread::GetTaskRunnerForThread(BrowserThread::UI),
+        BrowserThread::GetTaskRunnerForThread(BrowserThread::FILE)));
+  }
+  // There is no specification for how long OnUpdateActivity should prevent the
+  // screen from going to sleep. Empirically, twitch.tv calls this method every
+  // 10 seconds. Be conservative and allow 45 seconds (set in |delay_timer_|'s
+  // ctor) before deleting the block.
+  delay_timer_.Reset();
   return PP_OK;
 }
 
 int32_t PepperFlashBrowserHost::OnGetLocalTimeZoneOffset(
     ppapi::host::HostMessageContext* host_context,
     const base::Time& t) {
   // The reason for this processing being in the browser process is that on
   // Linux, the localtime calls require filesystem access prohibited by the
   // sandbox.
   host_context->reply_msg = PpapiPluginMsg_Flash_GetLocalTimeZoneOffsetReply(
@@ skipping 51 matching lines @@
       restrictions = PP_FLASHLSORESTRICTIONS_BLOCK;
     else if (cookie_settings_->IsCookieSessionOnly(plugin_url))
       restrictions = PP_FLASHLSORESTRICTIONS_IN_MEMORY;
   }
   SendReply(reply_context,
             PpapiPluginMsg_Flash_GetLocalDataRestrictionsReply(
                 static_cast<int32_t>(restrictions)));
 }
 
 }  // namespace chrome