Hook up TABLET_MODE switch to maximize_mode_controller

ash/wm/maximize_mode/maximize_mode_controller_unittest.cc

Index: ash/wm/maximize_mode/maximize_mode_controller_unittest.cc
diff --git a/ash/wm/maximize_mode/maximize_mode_controller_unittest.cc b/ash/wm/maximize_mode/maximize_mode_controller_unittest.cc
index 251885b7212fc2907158ccc625f6a02efdc56235..41b6bf9743bfd524214e6e1ff99272659f22887a 100644
--- a/ash/wm/maximize_mode/maximize_mode_controller_unittest.cc
+++ b/ash/wm/maximize_mode/maximize_mode_controller_unittest.cc
@@ -155,6 +155,15 @@ class MaximizeModeControllerTest : public test::AshTestBase {
     return maximize_mode_controller()->WasLidOpenedRecently();
   }
 
+  void ToggleTabletMode(const bool on) {
+    maximize_mode_controller()->TabletModeEventReceived(
+        on, maximize_mode_controller()->tick_clock_->NowTicks());
+  }
+
+  bool WasTabletModeOn() {
+    return maximize_mode_controller()->tablet_mode_switch_was_on_;
+  }
+
   bool AreEventsBlocked() {
     return !!maximize_mode_controller()->event_blocker_.get();
   }
@@ -266,6 +275,32 @@ TEST_F(MaximizeModeControllerTest, WasLidOpenedRecentlyOverTime) {
   EXPECT_FALSE(WasLidOpenedRecently());
 }
 
+TEST_F(MaximizeModeControllerTest, TabletModeTransition) {
+  ASSERT_FALSE(WasTabletModeOn());
+
+  OpenLidToAngle(90.0f);
+  EXPECT_FALSE(IsMaximizeModeStarted());
+
+  OpenLidToAngle(355.0f);
+  EXPECT_FALSE(IsMaximizeModeStarted());
+
+  ToggleTabletMode(true);
+  EXPECT_FALSE(WasTabletModeOn());
+  EXPECT_TRUE(IsMaximizeModeStarted());
+
+  ToggleTabletMode(false);
+  EXPECT_TRUE(WasTabletModeOn());
+  EXPECT_TRUE(IsMaximizeModeStarted());
+
+  OpenLidToAngle(300.0f);
+  EXPECT_TRUE(WasTabletModeOn());
+  EXPECT_TRUE(IsMaximizeModeStarted());
+
+  OpenLidToAngle(90.0f);
+  EXPECT_FALSE(WasTabletModeOn());
+  EXPECT_FALSE(IsMaximizeModeStarted());
+}
+
 // Verify the maximize mode enter/exit thresholds for stable angles.
 TEST_F(MaximizeModeControllerTest, StableHingeAnglesWithLidOpened) {
   ASSERT_FALSE(IsMaximizeModeStarted());