Add overrides to SkAndroidSDKCanvas, update SkHwuiRenderer

We can not call android::uirenderer::DisplayListCanvas::reset()
after the object has been constructed (due to an assert), so remove
that call. Add two missing overrides to SkAndroidSDKCanvas:
onDrawAtlas() and onDrawImageNine().

BUG=skia:4216
R=djsollen@google.com

patch from issue 1377533003 at patchset 20001 (http://crrev.com/1377533003#ps20001)

Review URL: https://codereview.chromium.org/1369923003
3 files changed