Roll ANGLE f047097..71168a0

https://chromium.googlesource.com/angle/angle.git/+log/f047097..71168a0

BUG=chromium:674143

TBR=cwallez@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

Review-Url: https://codereview.chromium.org/2597443002
Cr-Commit-Position: refs/heads/master@{#439866}

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': 'f04709744dd7abd4c41371fa3bfcc375fb7030cf',
+  'angle_revision': '71168a07faaadc6896d8a634fd8862d8709a58c9',
   # 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.