Refactor SkImageFilter into its own .cpp file.

Review URL:  https://codereview.appspot.com/6465073/



git-svn-id: http://skia.googlecode.com/svn/trunk@5188 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gyp/core.gypi b/gyp/core.gypi
index 2f44ca0..3a36987 100644
--- a/gyp/core.gypi
+++ b/gyp/core.gypi
@@ -86,6 +86,7 @@
         '<(skia_src_path)/core/SkGlyphCache.h',
         '<(skia_src_path)/core/SkGraphics.cpp',
         '<(skia_src_path)/core/SkInstCnt.cpp',
+        '<(skia_src_path)/core/SkImageFilter.cpp',
         '<(skia_src_path)/core/SkLineClipper.cpp',
         '<(skia_src_path)/core/SkMallocPixelRef.cpp',
         '<(skia_src_path)/core/SkMask.cpp',
@@ -191,6 +192,7 @@
         '<(skia_include_path)/core/SkFontHost.h',
         '<(skia_include_path)/core/SkGeometry.h',
         '<(skia_include_path)/core/SkGraphics.h',
+        '<(skia_include_path)/core/SkImageFilter.h',
         '<(skia_include_path)/core/SkInstCnt.h',
         '<(skia_include_path)/core/SkMallocPixelRef.h',
         '<(skia_include_path)/core/SkMask.h',