add pathops tight bounds; conform path ops' gyp to unit tests

gyp/core.gypi

 # Include this gypi to include all 'core' files
 # The parent gyp/gypi file must define
 #       'skia_src_path'     e.g. skia/trunk/src
 #       'skia_include_path' e.g. skia/trunk/include
 #
 # The skia build defines these in common_variables.gypi
 #
 {
     'sources': [
         '<(skia_src_path)/core/SkAAClip.cpp',
@@ skipping 322 matching lines @@
         '<(skia_src_path)/pathops/SkPathOpsBounds.cpp',
         '<(skia_src_path)/pathops/SkPathOpsCommon.cpp',
         '<(skia_src_path)/pathops/SkPathOpsCubic.cpp',
         '<(skia_src_path)/pathops/SkPathOpsDebug.cpp',
         '<(skia_src_path)/pathops/SkPathOpsLine.cpp',
         '<(skia_src_path)/pathops/SkPathOpsOp.cpp',
         '<(skia_src_path)/pathops/SkPathOpsPoint.cpp',
         '<(skia_src_path)/pathops/SkPathOpsQuad.cpp',
         '<(skia_src_path)/pathops/SkPathOpsRect.cpp',
         '<(skia_src_path)/pathops/SkPathOpsSimplify.cpp',
+        '<(skia_src_path)/pathops/SkPathOpsTightBounds.cpp',
         '<(skia_src_path)/pathops/SkPathOpsTriangle.cpp',
         '<(skia_src_path)/pathops/SkPathOpsTypes.cpp',
         '<(skia_src_path)/pathops/SkPathWriter.cpp',
         '<(skia_src_path)/pathops/SkQuarticRoot.cpp',
         '<(skia_src_path)/pathops/SkReduceOrder.cpp',
         '<(skia_src_path)/pathops/SkAddIntersections.h',
         '<(skia_src_path)/pathops/SkDQuadImplicit.h',
         '<(skia_src_path)/pathops/SkIntersectionHelper.h',
         '<(skia_src_path)/pathops/SkIntersections.h',
         '<(skia_src_path)/pathops/SkLineParameters.h',
@@ skipping 11 matching lines @@
         '<(skia_src_path)/pathops/SkPathOpsPoint.h',
         '<(skia_src_path)/pathops/SkPathOpsQuad.h',
         '<(skia_src_path)/pathops/SkPathOpsRect.h',
         '<(skia_src_path)/pathops/SkPathOpsTriangle.h',
         '<(skia_src_path)/pathops/SkPathOpsTypes.h',
         '<(skia_src_path)/pathops/SkPathWriter.h',
         '<(skia_src_path)/pathops/SkQuarticRoot.h',
         '<(skia_src_path)/pathops/SkReduceOrder.h',
     ],
 }