chromeos: disables event throttling in window-service clients

Only the window-service should throttle.

BUG=929914
TEST=none
TBR=sadrul@chromium.org

Change-Id: Iab7ea987c8fcb1f52b9c1e69576a0f950d790787
Reviewed-on: https://chromium-review.googlesource.com/c/1470941
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#631868}
diff --git a/ui/aura/env.cc b/ui/aura/env.cc
index fd82e8f..cbb9935 100644
--- a/ui/aura/env.cc
+++ b/ui/aura/env.cc
@@ -325,6 +325,9 @@
   if (mode_ == Mode::MUS) {
     EnableMusOSExchangeDataProvider();
     EnableMusOverrideInputInjector();
+    // Remote clients should not throttle, only the window-service should
+    // throttle (which corresponds to Mode::LOCAL).
+    throttle_input_on_resize_ = false;
     return;
   }