Disable GenerationPauses on Android.

UserLevelMemoryPressureSignalGeneratorTest.GenerationPauses is failing
on some Android builders. This CL disables it.

TBR=slangley@chromium.org

Bug: 1058178
Change-Id: I5bbee637ee9a23589bfe7d5c0be93406bf372c5d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2086311Reviewed-by: Xing Liu <xingliu@chromium.org>
Commit-Queue: Xing Liu <xingliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#746599}

third_party/blink/renderer/controller/user_level_memory_pressure_signal_generator_test.cc

@@ -137,7 +137,13 @@ TEST_F(UserLevelMemoryPressureSignalGeneratorTest,
   }
 }
 
-TEST_F(UserLevelMemoryPressureSignalGeneratorTest, GenerationPauses) {
+// Flaky on Android, see crbug/1058178.
+#if defined(OS_ANDROID)
+#define MAYBE_GenerationPauses DISABLED_GenerationPauses
+#else
+#define MAYBE_GenerationPauses GenerationPauses
+#endif
+TEST_F(UserLevelMemoryPressureSignalGeneratorTest, MAYBE_GenerationPauses) {
   {
     std::unique_ptr<MockMemoryUsageMonitor> mock_memory_usage_monitor =
         std::make_unique<MockMemoryUsageMonitor>();