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

BUG=377508
TEST=Manually verified this updated angle matches expectations.

Review URL: https://codereview.chromium.org/293383004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@272897 0039d316-1c4b-4281-b951-d872f2087c98

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;