Update PIEX version and adjust the RAW codec accordingly

DEPS

 use_relative_paths = True
 
 # Dependencies on outside packages.
 #
 deps = {
   "common": "https://skia.googlesource.com/common.git@c282fe0b6e392b14f88d647cbd86e1a3ef5498e0",
 
   # There is some duplication here that might be worth cleaning up:
   #   - can use use our existing t_p/e/libjpeg instead of pulling it for Android?
 
   "third_party/externals/angle2"  : "https://chromium.googlesource.com/angle/angle.git@8182049470aa3ba0c9f7c54ef965bf1877df08cb",
   "third_party/externals/cmake"   : "https://cmake.googlesource.com/cmake.git@v3.3.1",
   "third_party/externals/freetype": "https://skia.googlesource.com/third_party/freetype2.git@6a19a7d332c5446542196e5aeda0ede109ef097b",
   "third_party/externals/gyp"     : "https://chromium.googlesource.com/external/gyp.git@87ac4d0e63fc7dd8152a350327fea8dcf031bf56",
   "third_party/externals/harfbuzz": "https://skia.googlesource.com/third_party/harfbuzz.git@0.9.35",
   "third_party/externals/jsoncpp" : "https://chromium.googlesource.com/external/github.com/open-source-parsers/jsoncpp.git@1.0.0",
   "third_party/externals/libwebp" : "https://chromium.googlesource.com/webm/libwebp.git@v0.5.0",
   "third_party/externals/nanomsg" : "https://skia.googlesource.com/third_party/nanomsg.git@0.4-beta",
   "third_party/externals/zlib"    : "https://chromium.googlesource.com/chromium/src/third_party/zlib@c4e33043fb071b6ea0a153845da625d7ed633d3d",
   # NOTE: If we update libpng, we may need to update the generated file at third_party/libpng/pnglibconf.h
   "third_party/externals/libpng"  : "https://skia.googlesource.com/third_party/libpng.git@5765a2224946b953ec6702bd01205af475f8c80a",
   "third_party/externals/giflib"  : "https://android.googlesource.com/platform/external/giflib.git@ab10e256df4f684260ca239905b1cec727181f6c",
 
   "third_party/externals/dng_sdk" : "https://android.googlesource.com/platform/external/dng_sdk.git@e95f96bb9d29978211250ee764ba78731ad316df",
-  "third_party/externals/piex"    : "https://android.googlesource.com/platform/external/piex.git@883a1e5419990f51b8e928969e9c5a09869bce0e",
+  "third_party/externals/piex"    : "https://android.googlesource.com/platform/external/piex.git@2f5d8eafb5648056703d6b3dec237d293f75f99e",

[scroggo, 2016/04/13 15:54:31]

In the future, it might be a good idea to update here before updating nyc-dev so
you can get some feedback. It would at least be good to keep them in sync as
much as you can. We've missed bugs in libpng because our tests weren't testing
the latest version shipping in Android :(

[yujieqin, 2016/04/14 07:54:58]

Totally agree!!! It was my fault this time to rush into nyc-dev before doing
here.

 
   "third_party/externals/libjpeg-turbo"             : "https://skia.googlesource.com/third_party/libjpeg-turbo.git@b38b934d246fca482eb6801f4ce79422954a635e",
   # libjpeg-turbo depends on yasm to compile .asm files
   "third_party/externals/yasm/source/patched-yasm/" : "https://chromium.googlesource.com/chromium/deps/yasm/patched-yasm.git@4671120cd8558ce62ee8672ebf3eb6f5216f909b",
   "third_party/externals/yasm/binaries"             : "https://chromium.googlesource.com/chromium/deps/yasm/binaries.git@52f9b3f4b0aa06da24ef8b123058bb61ee468881",
 
   "third_party/externals/expat" : "https://android.googlesource.com/platform/external/expat.git@android-5.1.0_r3",
 
   "platform_tools/chromeos/toolchain/src/third_party/chromite": "https://chromium.googlesource.com/chromiumos/chromite.git@d6a4c7e0ee4d53ddc5238dbddfc0417796a70e54",
   "platform_tools/chromeos/toolchain/src/third_party/pyelftools": "https://chromium.googlesource.com/chromiumos/third_party/pyelftools.git@bdc1d380acd88d4bfaf47265008091483b0d614e",
@@ skipping 27 matching lines @@
     # xSAN bots build Clang from scratch.
     "third_party/externals/llvm": "https://llvm.googlesource.com/llvm@release_38",
     "third_party/externals/llvm/tools/clang": "https://llvm.googlesource.com/clang@release_38",
     "third_party/externals/llvm/projects/compiler-rt": "https://llvm.googlesource.com/compiler-rt@release_38",
     "third_party/externals/llvm/projects/libcxx": "https://llvm.googlesource.com/libcxx@release_38",
     "third_party/externals/llvm/projects/libcxxabi": "https://llvm.googlesource.com/libcxxabi@release_38",
   }
 }
 
 recursedeps = [ "common" ]