chromeos: Fix lock-before-suspend regression.

This fixes an uninitialized member variable in
ash::internal::PowerEventObserver that could result in the
screen not getting locked before the system goes to sleep.

BUG=312210

Review URL: https://codereview.chromium.org/49743004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@231622 0039d316-1c4b-4281-b951-d872f2087c98

4 files changed, 33 insertions, 2 deletions

diff --git a/chromeos/dbus/fake_power_manager_client.cc b/chromeos/dbus/fake_power_manager_client.cc
index 3c70a6f..81ca360 100644
--- a/chromeos/dbus/fake_power_manager_client.cc
+++ b/chromeos/dbus/fake_power_manager_client.cc
@@ -51,6 +51,10 @@ base::Closure FakePowerManagerClient::GetSuspendReadinessCallback() {
   return base::Closure();
 }
 
+int FakePowerManagerClient::GetNumPendingSuspendReadinessCallbacks() {
+  return 0;
+}
+
 bool FakePowerManagerClient::HasObserver(Observer* observer) {
   return false;
 }
diff --git a/chromeos/dbus/fake_power_manager_client.h b/chromeos/dbus/fake_power_manager_client.h
index d89bb51..ae1adc5 100644
--- a/chromeos/dbus/fake_power_manager_client.h
+++ b/chromeos/dbus/fake_power_manager_client.h
@@ -47,6 +47,7 @@ class FakePowerManagerClient : public PowerManagerClient {
       const power_manager::PowerManagementPolicy& policy) OVERRIDE;
   virtual void SetIsProjecting(bool is_projecting) OVERRIDE;
   virtual base::Closure GetSuspendReadinessCallback() OVERRIDE;
+  virtual int GetNumPendingSuspendReadinessCallbacks() OVERRIDE;
 
   power_manager::PowerManagementPolicy& get_policy() { return policy_; }
 
diff --git a/chromeos/dbus/power_manager_client.cc b/chromeos/dbus/power_manager_client.cc
index 82b934a..c065c09 100644
--- a/chromeos/dbus/power_manager_client.cc
+++ b/chromeos/dbus/power_manager_client.cc
@@ -211,6 +211,10 @@ class PowerManagerClientImpl : public PowerManagerClient {
                       weak_ptr_factory_.GetWeakPtr(), pending_suspend_id_);
   }
 
+  virtual int GetNumPendingSuspendReadinessCallbacks() OVERRIDE {
+    return num_pending_suspend_readiness_callbacks_;
+  }
+
  protected:
   virtual void Init(dbus::Bus* bus) OVERRIDE {
     power_manager_proxy_ = bus->GetObjectProxy(
@@ -641,11 +645,16 @@ class PowerManagerClientStubImpl : public PowerManagerClient {
         brightness_(50.0),
         pause_count_(2),
         cycle_count_(0),
+        num_pending_suspend_readiness_callbacks_(0),
         weak_ptr_factory_(this) {}
 
   virtual ~PowerManagerClientStubImpl() {}
 
-  // PowerManagerClient overrides
+  int num_pending_suspend_readiness_callbacks() const {
+    return num_pending_suspend_readiness_callbacks_;
+  }
+
+  // PowerManagerClient overrides:
   virtual void Init(dbus::Bus* bus) OVERRIDE {
     if (CommandLine::ForCurrentProcess()->HasSwitch(
         chromeos::switches::kEnableStubInteractive)) {
@@ -714,10 +723,19 @@ class PowerManagerClientStubImpl : public PowerManagerClient {
       const power_manager::PowerManagementPolicy& policy) OVERRIDE {}
   virtual void SetIsProjecting(bool is_projecting) OVERRIDE {}
   virtual base::Closure GetSuspendReadinessCallback() OVERRIDE {
-    return base::Closure();
+    num_pending_suspend_readiness_callbacks_++;
+    return base::Bind(&PowerManagerClientStubImpl::HandleSuspendReadiness,
+                      weak_ptr_factory_.GetWeakPtr());
+  }
+  virtual int GetNumPendingSuspendReadinessCallbacks() OVERRIDE {
+    return num_pending_suspend_readiness_callbacks_;
   }
 
  private:
+  void HandleSuspendReadiness() {
+    num_pending_suspend_readiness_callbacks_--;
+  }
+
   void UpdateStatus() {
     if (pause_count_ > 0) {
       pause_count_--;
@@ -802,6 +820,10 @@ class PowerManagerClientStubImpl : public PowerManagerClient {
   base::RepeatingTimer<PowerManagerClientStubImpl> update_timer_;
   power_manager::PowerSupplyProperties props_;
 
+  // Number of callbacks returned by GetSuspendReadinessCallback() but not yet
+  // invoked.
+  int num_pending_suspend_readiness_callbacks_;
+
   // Note: This should remain the last member so it'll be destroyed and
   // invalidate its weak pointers before any other members are destroyed.
   base::WeakPtrFactory<PowerManagerClientStubImpl> weak_ptr_factory_;
diff --git a/chromeos/dbus/power_manager_client.h b/chromeos/dbus/power_manager_client.h
index a24312b..5c957f4 100644
--- a/chromeos/dbus/power_manager_client.h
+++ b/chromeos/dbus/power_manager_client.h
@@ -143,6 +143,10 @@ class CHROMEOS_EXPORT PowerManagerClient : public DBusClient {
   // readiness for suspend.  See Observer::SuspendImminent().
   virtual base::Closure GetSuspendReadinessCallback() = 0;
 
+  // Returns the number of callbacks returned by GetSuspendReadinessCallback()
+  // for the current suspend attempt but not yet called. Used by tests.
+  virtual int GetNumPendingSuspendReadinessCallbacks() = 0;
+
   // Creates the instance.
   static PowerManagerClient* Create(DBusClientImplementationType type);