Revert the revert of 11247, 11250, 11251 and 11279 (Chrome already relies on changes in r11247)



git-svn-id: http://skia.googlecode.com/svn/trunk/gyp@11287 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/core.gypi b/core.gypi
index 6c00a56..a25173d 100644
--- a/core.gypi
+++ b/core.gypi
@@ -164,6 +164,7 @@
         '<(skia_src_path)/core/SkScan_Antihair.cpp',
         '<(skia_src_path)/core/SkScan_Hairline.cpp',
         '<(skia_src_path)/core/SkScan_Path.cpp',
+        '<(skia_src_path)/core/SkValidatingReadBuffer.cpp',
         '<(skia_src_path)/core/SkShader.cpp',
         '<(skia_src_path)/core/SkSpriteBlitter_ARGB32.cpp',
         '<(skia_src_path)/core/SkSpriteBlitter_RGB16.cpp',