Move SkDrawLooper implementation to its own file.

It previously lived in SkPaint.cpp.

BUG=
R=reed@google.com, tomhudson@chromium.org, jbroman@chromium.org

Author: jbroman@chromium.org

Review URL: https://chromiumcodereview.appspot.com/15896004

git-svn-id: http://skia.googlecode.com/svn/trunk@9272 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gyp/core.gypi b/gyp/core.gypi
index 0a2de91..d472c6d 100644
--- a/gyp/core.gypi
+++ b/gyp/core.gypi
@@ -70,6 +70,7 @@
         '<(skia_src_path)/core/SkDeviceProfile.cpp',
         '<(skia_src_path)/core/SkDither.cpp',
         '<(skia_src_path)/core/SkDraw.cpp',
+        '<(skia_src_path)/core/SkDrawLooper.cpp',
         '<(skia_src_path)/core/SkDrawProcs.h',
         '<(skia_src_path)/core/SkEdgeBuilder.cpp',
         '<(skia_src_path)/core/SkEdgeClipper.cpp',