Disable flaky HighlighterControllerTest.HighlighterGesturesScaled on ChromeOS.

TBR= kaznacheev@chromium.org

Bug: 794703
Change-Id: I0a8df88bc3b2e911cafdb05230336e2cc2aa04d3
Reviewed-on: https://chromium-review.googlesource.com/827011Reviewed-by: Henrik Grunell <grunell@chromium.org>
Commit-Queue: Henrik Grunell <grunell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524050}

ash/highlighter/highlighter_controller_unittest.cc

@@ -232,7 +232,13 @@ TEST_F(HighlighterControllerTest, HighlighterGestures) {
 }
 
 // Test that stylus gesture recognition correctly handles display scaling
-TEST_F(HighlighterControllerTest, HighlighterGesturesScaled) {
+// Flaky on ChromeOS. http://crbug.com/794703.
+#if defined(OS_CHROMEOS)
+#define MAYBE_HighlighterGesturesScaled DISABLED_HighlighterGesturesScaled
+#else
+#define MAYBE_HighlighterGesturesScaled HighlighterGesturesScaled
+#endif
+TEST_F(HighlighterControllerTest, MAYBE_HighlighterGesturesScaled) {
   controller_test_api_->SetEnabled(true);
   GetEventGenerator().EnterPenPointerMode();