Require at least a 25 degree rise angle before changing screen rotation.

ash/wm/maximize_mode/maximize_mode_controller.cc

Index: ash/wm/maximize_mode/maximize_mode_controller.cc
diff --git a/ash/wm/maximize_mode/maximize_mode_controller.cc b/ash/wm/maximize_mode/maximize_mode_controller.cc
index a969a91a07eca81e03746771c5cca4be2365de9f..2ca5e6261b282228d15010a9f9aef1ac2357e0fd 100644
--- a/ash/wm/maximize_mode/maximize_mode_controller.cc
+++ b/ash/wm/maximize_mode/maximize_mode_controller.cc
@@ -60,8 +60,10 @@ const float kDisplayRotationStickyAngleDegrees = 60.0f;
 
 // The minimum acceleration in a direction required to trigger screen rotation.
 // This prevents rapid toggling of rotation when the device is near flat and
-// there is very little screen aligned force on it.
-const float kMinimumAccelerationScreenRotation = 0.3f;
+// there is very little screen aligned force on it. The value is effectively the
+// sine of the rise angle required, with the current value requiring at least a
+// 25 degree rise.
+const float kMinimumAccelerationScreenRotation = 0.42f;
 
 const float kRadiansToDegrees = 180.0f / 3.14159265f;