SkPaint: eliminate some dead bytes in 64-bit build.

+ memcpy-based copy constructor was hiding this gap -> manual copy constructor.
+ Split tests for finer-grained failures.

BUG=skia:
R=reed@google.com, mtklein@google.com

Author: mtklein@chromium.org

Review URL: https://codereview.chromium.org/203203003

git-svn-id: http://skia.googlecode.com/svn/trunk@13856 2bbb7eff-a529-9590-31e7-b0007b416f81
3 files changed