Use SkLayerDrawLooper::Builder to construct SkLayerDrawLooper.

The addLayer() methods of SkLayerDrawLooper will soon be removed. This CL
updates all uses of those methods with the corresponding methods in
SkLayerDrawLooper::Builder.

BUG=skia:2141

Review URL: https://codereview.chromium.org/177343005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253100 0039d316-1c4b-4281-b951-d872f2087c98
Fixes minor glitches of the sound level indicator circle.

The existing code sets the center of the circle at the center point
of the mic image. However, the mic circle is positioned slightly
above in the image (to draw the shadow at the bottom).

This CL adds the offset for the vertical position of the indicator
circle and the offset for the minimum radius.

Also, sets the anti-alias flag for painting the circle to draw
the edge smoothly.

BUG=None
R=xiyuan@chromium.org
TEST=my eyes

Review URL: https://codereview.chromium.org/168243004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253101 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 253101