Add R-Tree data structure.
Review URL: https://codereview.appspot.com/6489055

git-svn-id: http://skia.googlecode.com/svn/trunk@5401 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gyp/core.gypi b/gyp/core.gypi
index 99227a3..9e416ac 100644
--- a/gyp/core.gypi
+++ b/gyp/core.gypi
@@ -14,6 +14,7 @@
         '<(skia_src_path)/core/SkAdvancedTypefaceMetrics.cpp',
         '<(skia_src_path)/core/SkAlphaRuns.cpp',
         '<(skia_src_path)/core/SkAntiRun.h',
+        '<(skia_src_path)/core/SkBBoxHierarchy.h',
         '<(skia_src_path)/core/SkBitmap.cpp',
         '<(skia_src_path)/core/SkBitmapHeap.cpp',
         '<(skia_src_path)/core/SkBitmapHeap.h',
@@ -127,6 +128,8 @@
         '<(skia_src_path)/core/SkRegion.cpp',
         '<(skia_src_path)/core/SkRegionPriv.h',
         '<(skia_src_path)/core/SkRegion_path.cpp',
+        '<(skia_src_path)/core/SkRTree.h',
+        '<(skia_src_path)/core/SkRTree.cpp',
         '<(skia_src_path)/core/SkScalar.cpp',
         '<(skia_src_path)/core/SkScalerContext.cpp',
         '<(skia_src_path)/core/SkScan.cpp',