Update ANGLE to latest as of August 25, 2016

DEPS

Index: DEPS
diff --git a/DEPS b/DEPS
index 62f6fd9b05d102eac2f292b079b24b55669cd968..0be68eb9aff0a23611b83ce233ba006685dd2590 100644
--- a/DEPS
+++ b/DEPS
@@ -10,7 +10,7 @@ deps = {
   # 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/angle2"  : "https://chromium.googlesource.com/angle/angle.git@55033e583ba1bc5cbfafbab11d3255fecdfe9056",
   "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",