Add a new app API to enable watchdog behavior restarts in kiosk apps

extensions/browser/api/runtime/runtime_api.h

Index: extensions/browser/api/runtime/runtime_api.h
diff --git a/extensions/browser/api/runtime/runtime_api.h b/extensions/browser/api/runtime/runtime_api.h
index 187f7b0d7f16d0fb8e9f60cd2d45c50782e698fb..14d03e0c49505077822e128304bf9a3789d87946 100644
--- a/extensions/browser/api/runtime/runtime_api.h
+++ b/extensions/browser/api/runtime/runtime_api.h
@@ -65,10 +65,19 @@ class RuntimeAPI : public BrowserContextKeyedAPI,
   void OpenURL(const GURL& uninstall_url);
   bool GetPlatformInfo(api::runtime::PlatformInfo* info);
   bool RestartDevice(std::string* error_message);
+
+  using OnWatchdogTimeoutCallback =
+      base::Callback<void(bool success, const std::string& message)>;
+  void RestartDeviceOnWatchdogTimeout(
+      const Extension* extension,
+      int seconds,
+      const OnWatchdogTimeoutCallback& callback);
+
   bool OpenOptionsPage(const Extension* extension);
 
  private:
   friend class BrowserContextKeyedAPIFactory<RuntimeAPI>;
+  friend class RestartOnWatchdogApiTest;
 
   // ExtensionRegistryObserver implementation.
   void OnExtensionLoaded(content::BrowserContext* browser_context,
@@ -81,6 +90,9 @@ class RuntimeAPI : public BrowserContextKeyedAPI,
                               const Extension* extension,
                               UninstallReason reason) override;
 
+  void OnRestartWatchdogTimeout(const Extension* extension,
+                                const OnWatchdogTimeoutCallback& callback);
+
   // BrowserContextKeyedAPI implementation:
   static const char* service_name() { return "RuntimeAPI"; }
   static const bool kServiceRedirectedInIncognito = true;
@@ -102,6 +114,10 @@ class RuntimeAPI : public BrowserContextKeyedAPI,
   void RemovePendingOnInstallInfoFromPref(const ExtensionId& extension_id);
   void StorePendingOnInstallInfoToPref(const Extension* extension);
 
+  void SetMinDurationBetweenRestartsForTesting(base::TimeDelta delta) {
+    minimum_duration_between_restarts_ = delta;
+  }
+
   std::unique_ptr<RuntimeAPIDelegate> delegate_;
 
   content::BrowserContext* browser_context_;
@@ -118,6 +134,13 @@ class RuntimeAPI : public BrowserContextKeyedAPI,
   ScopedObserver<ProcessManager, ProcessManagerObserver>
       process_manager_observer_;
 
+  // The timer that will trigger a device restart when it times out.
+  base::OneShotTimer watchdog_timer_;

[xiyuan, 2016/05/13 17:56:15]

nit: #include "base/timer/timer.h"

[afakhry, 2016/05/14 01:27:35]

Done.

+
+  // The minimum allowed duration between two successive restarts on watchdog
+  // timer.
+  base::TimeDelta minimum_duration_between_restarts_;

[xiyuan, 2016/05/13 17:56:15]

nit: #include "base/time/time.h"

[afakhry, 2016/05/14 01:27:35]

Done.

+
   DISALLOW_COPY_AND_ASSIGN(RuntimeAPI);
 };
 
@@ -220,6 +243,19 @@ class RuntimeRestartFunction : public UIThreadExtensionFunction {
   ResponseAction Run() override;
 };
 
+class RuntimeRestartOnWatchdogFunction : public UIThreadExtensionFunction {
+ public:
+  DECLARE_EXTENSION_FUNCTION("runtime.restartOnWatchdog",
+                             RUNTIME_RESTARTONWATCHDOG)
+
+ protected:
+  ~RuntimeRestartOnWatchdogFunction() override {}
+  ResponseAction Run() override;
+
+ private:
+  void OnWatchdogTimeout(bool success, const std::string& message);
+};
+
 class RuntimeGetPlatformInfoFunction : public UIThreadExtensionFunction {
  public:
   DECLARE_EXTENSION_FUNCTION("runtime.getPlatformInfo",