Hook up TABLET_MODE switch to maximize_mode_controller

ash/wm/maximize_mode/maximize_mode_controller.h

Index: ash/wm/maximize_mode/maximize_mode_controller.h
diff --git a/ash/wm/maximize_mode/maximize_mode_controller.h b/ash/wm/maximize_mode/maximize_mode_controller.h
index b761a4d3d2dbb8cec81f2930733565cfaeead67a..87ab1c9fb5653c6a5464fca85315c7f6a8132c8b 100644
--- a/ash/wm/maximize_mode/maximize_mode_controller.h
+++ b/ash/wm/maximize_mode/maximize_mode_controller.h
@@ -93,6 +93,7 @@ class ASH_EXPORT MaximizeModeController :
 
   // PowerManagerClient::Observer:
   void LidEventReceived(bool open, const base::TimeTicks& time) override;
+  void TabletModeEventReceived(bool on, const base::TimeTicks& time) override;
   void SuspendImminent() override;
   void SuspendDone(const base::TimeDelta& sleep_duration) override;
 #endif  // OS_CHROMEOS
@@ -169,6 +170,13 @@ class ASH_EXPORT MaximizeModeController :
   // Source for the current time in base::TimeTicks.
   std::unique_ptr<base::TickClock> tick_clock_;
 
+#if defined(OS_CHROMEOS)
+  // Forces maximize mode. Used along with the tablet_mode switch on Chrome OS.

[Daniel Erat, 2016/06/03 15:00:19]

what's "tablet_mode" referring to here? if it's a variable name, please write it
as |tablet_mode|; otherwise, please use "tablet mode". (if it's referring to the
kernel event code, that'd be SW_TABLET_MODE, right?)

[jcliang, 2016/06/06 04:39:22]

Done.

+  // When the tablet_mode switch is on we force maximize mode no matter what the
+  // lid angle is.
+  bool tablet_mode_;

[Daniel Erat, 2016/06/03 15:00:18]

how about something like "tablet_mode_switch_is_on_" instead? that makes it a
bit clearer where this comes from.

[jcliang, 2016/06/06 04:39:22]

Done.

+#endif
+
   // Tracks when the lid is closed. Used to prevent entering maximize mode.
   bool lid_is_closed_;