Use PowerSaveBlocker for audio and video on Chrome OS.

content/browser/power_save_blocker_mac.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 "content/browser/power_save_blocker_impl.h"
 
 #include <IOKit/pwr_mgt/IOPMLib.h>
 
 #include "base/bind.h"
 #include "base/lazy_instance.h"
@@ skipping 23 matching lines @@
   static void Delete(base::Thread* instance) { }
 };
 base::LazyInstance<base::Thread, PowerSaveBlockerLazyInstanceTraits>
     g_power_thread = LAZY_INSTANCE_INITIALIZER;
 
 }  // namespace
 
 class PowerSaveBlockerImpl::Delegate
     : public base::RefCountedThreadSafe<PowerSaveBlockerImpl::Delegate> {
  public:
-  Delegate(PowerSaveBlockerType type, const std::string& reason)
-      : type_(type), reason_(reason), assertion_(kIOPMNullAssertionID) {}
+  Delegate(PowerSaveBlockerType type, const std::string& description)
+      : type_(type),
+        description_(description),
+        assertion_(kIOPMNullAssertionID) {}
 
   // Does the actual work to apply or remove the desired power save block.
   void ApplyBlock();
   void RemoveBlock();
 
  private:
   friend class base::RefCountedThreadSafe<Delegate>;
   ~Delegate() {}
   PowerSaveBlockerType type_;
-  std::string reason_;
+  std::string description_;
   IOPMAssertionID assertion_;
 };
 
 void PowerSaveBlockerImpl::Delegate::ApplyBlock() {
   DCHECK_EQ(base::PlatformThread::CurrentId(),
             g_power_thread.Pointer()->thread_id());
 
   CFStringRef level = NULL;
   // See QA1340 <http://developer.apple.com/library/mac/#qa/qa1340/> for more
   // details.
   switch (type_) {
     case PowerSaveBlocker::kPowerSaveBlockPreventAppSuspension:
       level = kIOPMAssertionTypeNoIdleSleep;
       break;
     case PowerSaveBlocker::kPowerSaveBlockPreventDisplaySleep:
       level = kIOPMAssertionTypeNoDisplaySleep;
       break;
     default:
       NOTREACHED();
       break;
   }
   if (level) {
-    base::ScopedCFTypeRef<CFStringRef> cf_reason(
-        base::SysUTF8ToCFStringRef(reason_));
-    IOReturn result = IOPMAssertionCreateWithName(level,
-                                                  kIOPMAssertionLevelOn,
-                                                  cf_reason,
-                                                  &assertion_);
+    base::ScopedCFTypeRef<CFStringRef> cf_description(
+        base::SysUTF8ToCFStringRef(description_));
+    IOReturn result = IOPMAssertionCreateWithName(level, kIOPMAssertionLevelOn,
+                                                  cf_description, &assertion_);
     LOG_IF(ERROR, result != kIOReturnSuccess)
         << "IOPMAssertionCreate: " << result;
   }
 }
 
 void PowerSaveBlockerImpl::Delegate::RemoveBlock() {
   DCHECK_EQ(base::PlatformThread::CurrentId(),
             g_power_thread.Pointer()->thread_id());
 
   if (assertion_ != kIOPMNullAssertionID) {
     IOReturn result = IOPMAssertionRelease(assertion_);
     LOG_IF(ERROR, result != kIOReturnSuccess)
         << "IOPMAssertionRelease: " << result;
   }
 }
 
 PowerSaveBlockerImpl::PowerSaveBlockerImpl(PowerSaveBlockerType type,
-                                           const std::string& reason)
-    : delegate_(new Delegate(type, reason)) {
+                                           Reason reason,
+                                           const std::string& description)
+    : delegate_(new Delegate(type, description)) {
   g_power_thread.Pointer()->message_loop()->PostTask(
       FROM_HERE,
       base::Bind(&Delegate::ApplyBlock, delegate_));
 }
 
 PowerSaveBlockerImpl::~PowerSaveBlockerImpl() {
   g_power_thread.Pointer()->message_loop()->PostTask(
       FROM_HERE,
       base::Bind(&Delegate::RemoveBlock, delegate_));
 }
 
 }  // namespace content