A new copy of the old system monitor changelist.

Review URL: http://codereview.chromium.org/12817

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@6126 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 19 insertions, 8 deletions

diff --git a/chrome/browser/safe_browsing/safe_browsing_service.cc b/chrome/browser/safe_browsing/safe_browsing_service.cc
index 3a6fff3..193ac18 100644
--- a/chrome/browser/safe_browsing/safe_browsing_service.cc
+++ b/chrome/browser/safe_browsing/safe_browsing_service.cc
@@ -12,6 +12,7 @@
 #include "base/path_service.h"
 #include "base/string_util.h"
 #include "chrome/browser/browser_process.h"
+#include "chrome/browser/chrome_thread.h"
 #include "chrome/browser/profile_manager.h"
 #include "chrome/browser/safe_browsing/protocol_manager.h"
 #include "chrome/browser/safe_browsing/safe_browsing_blocking_page.h"
@@ -34,9 +35,16 @@ SafeBrowsingService::SafeBrowsingService()
       resetting_(false),
       database_loaded_(false) {
   new_safe_browsing_ = !CommandLine().HasSwitch(switches::kUseOldSafeBrowsing);
+  base::SystemMonitor* monitor = base::SystemMonitor::Get();
+  DCHECK(monitor);
+  if (monitor)
+    monitor->AddObserver(this);
 }
 
 SafeBrowsingService::~SafeBrowsingService() {
+  base::SystemMonitor* monitor = base::SystemMonitor::Get();
+  if (monitor)
+    monitor->RemoveObserver(this);
 }
 
 // Only called on the UI thread.
@@ -662,18 +670,17 @@ void SafeBrowsingService::CacheHashResults(
   GetDatabase()->CacheHashResults(prefixes, full_hashes);
 }
 
-void SafeBrowsingService::OnSuspend() {
+void SafeBrowsingService::OnSuspend(base::SystemMonitor*) {
 }
 
 // Tell the SafeBrowsing database not to do expensive disk operations for a few
 // minutes after waking up. It's quite likely that the act of resuming from a
 // low power state will involve much disk activity, which we don't want to
 // exacerbate.
-void SafeBrowsingService::OnResume() {
-  DCHECK(MessageLoop::current() == io_loop_);
+void SafeBrowsingService::OnResume(base::SystemMonitor*) {
   if (enabled_) {
-    db_thread_->message_loop()->PostTask(FROM_HERE,
-        NewRunnableMethod(this, &SafeBrowsingService::HandleResume));
+    ChromeThread::GetMessageLoop(ChromeThread::DB)->PostTask(FROM_HERE,
+      NewRunnableMethod(this, &SafeBrowsingService::HandleResume));
   }
 }
 
diff --git a/chrome/browser/safe_browsing/safe_browsing_service.h b/chrome/browser/safe_browsing/safe_browsing_service.h
index 761acb2..c3125e5 100644
--- a/chrome/browser/safe_browsing/safe_browsing_service.h
+++ b/chrome/browser/safe_browsing/safe_browsing_service.h
@@ -16,6 +16,7 @@
 #include "base/hash_tables.h"
 #include "base/ref_counted.h"
 #include "base/scoped_ptr.h"
+#include "base/system_monitor.h"
 #include "base/thread.h"
 #include "base/time.h"
 #include "chrome/browser/safe_browsing/safe_browsing_util.h"
@@ -31,7 +32,8 @@ class SafeBrowsingProtocolManager;
 
 // Construction needs to happen on the main thread.
 class SafeBrowsingService
-    : public base::RefCountedThreadSafe<SafeBrowsingService> {
+    : public base::RefCountedThreadSafe<SafeBrowsingService>,
+      public base::SystemMonitor::PowerObserver {
  public:
   // Users of this service implement this interface to be notified
   // asynchronously of the result.
@@ -169,10 +171,12 @@ class SafeBrowsingService
   // the current page is 'safe'.
   void LogPauseDelay(base::TimeDelta time);
 
+  // PowerObserver notifications
   // We defer SafeBrowsing work for a short duration when the computer comes
   // out of a suspend state to avoid thrashing the disk.
-  void OnSuspend();
-  void OnResume();
+  void OnPowerStateChange(base::SystemMonitor*) {};
+  void OnSuspend(base::SystemMonitor*);
+  void OnResume(base::SystemMonitor*);
 
   bool new_safe_browsing() const { return new_safe_browsing_; }