Disable FlingControllerTest.ControllerHandlesTouchpadGestureFling.

This test often flakes on the Fuchsia/ARM64 FYI bot, indicating that it
is likely racey under pathological scheduler timings.

TBR=tdresser@chromium.org

Bug: 836996
Change-Id: I365050083bc4a7ee21d3ef5f1e05ccee35dc6cb1
Reviewed-on: https://chromium-review.googlesource.com/1161326Reviewed-by: Wez <wez@chromium.org>
Commit-Queue: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580355}

content/browser/renderer_host/input/fling_controller_unittest.cc

@@ -154,7 +154,8 @@ TEST_F(FlingControllerTest,
   EXPECT_EQ(WebInputEvent::kGestureScrollEnd, last_sent_gesture_.GetType());
 }
 
-TEST_F(FlingControllerTest, ControllerHandlesTouchpadGestureFling) {
+// TODO(https://crbug.com/836996): Timing-dependent flakes on some platforms.
+TEST_F(FlingControllerTest, DISABLED_ControllerHandlesTouchpadGestureFling) {
   base::TimeTicks progress_time = base::TimeTicks::Now();
   SimulateFlingStart(blink::kWebGestureDeviceTouchpad, gfx::Vector2dF(1000, 0));
   EXPECT_TRUE(FlingInProgress());