Make CornerHandleView use device radius.

Both the radius and margin will vary from device to device. Created a
derivation of margin from the radius values based upon numbers on real
devices.

Bug: 133861138
Test: Verified padding and radius on multiple devices.
Change-Id: I3a284d75da8beb7ab77e5cb8e1fa8af57c5e3978
1 file changed