Roll ANGLE 27a6063..70c95fa

https://chromium.googlesource.com/angle/angle.git/+log/27a6063..70c95fa

BUG=chromium:739448,chromium:731324,:angleproject:1644,chromium:682815

TBR=jmadill@chromium.org

TEST=bots

CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.win:win_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel

Change-Id: I9ed559801bfbb7cada2fef863096047f33437703
Reviewed-on: https://chromium-review.googlesource.com/565051Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Geoff Lang <geofflang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#485290}

DEPS

@@ -52,7 +52,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling ANGLE
   # and whatever else without interference from each other.
-  'angle_revision': '27a606316e1ec4ee7cd45178de40ae1a05235f45',
+  'angle_revision': '70c95fa6ffcbe0914adb5e641288b910ddf1db12',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling build tools
   # and whatever else without interference from each other.