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..cb39f409b458925a1dffcfae3a82faf8916f128a 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.
+  // When the tablet_mode switch is on we force maximize mode no matter what the
+  // lid angle is.
+  bool force_maximize_mode_;

[jonross, 2016/06/03 03:27:19]

We have ways to forcibly trigger maximize mode, and disregard accelerometers.
See EnterMaximizeMode checking for a testing flag, and ignoring accelerometers.

Can this be named after the sensor? 

Eg: tablet_mode_

[jcliang, 2016/06/03 05:28:49]

Do you mean switches::kAshEnableTouchViewTesting? I thought this is a
command-line switch so we can't use it.
Done.

[jonross, 2016/06/03 16:27:24]

Yeah we can't use the switch here, I was just bringing up the naming, as we
already have a 'force' effectively.

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