Increase timeout in WebStateTest.Snapshot

The current timeout for page load (0.1s) is a bit short and leads to
flakyness on official bots on iPad Air.
I can reproduce the flakyness locally.
Increase the timeout to 1s as the loading is not the tested part.

Bug: None
Change-Id: Ie944a99590f8083e2c22d43769dcdf7d9a0dcab1
Reviewed-on: https://chromium-review.googlesource.com/579369Reviewed-by: Ed Chin <edchin@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Olivier Robin <olivierrobin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488649}

ios/web/web_state/web_state_unittest.mm

@@ -127,7 +127,7 @@ TEST_F(WebStateTest, Snapshot) {
       addSubview:web_state()->GetView()];
   // The subview is added but not immediately painted, so a small delay is
   // necessary.
-  base::test::ios::SpinRunLoopWithMinDelay(base::TimeDelta::FromSecondsD(0.1));
+  base::test::ios::SpinRunLoopWithMinDelay(base::TimeDelta::FromSecondsD(0.2));
   CGSize target_size = CGSizeMake(100.0f, 100.0f);
   web_state()->TakeSnapshot(
       base::BindBlockArc(^(const gfx::Image& snapshot) {