Disable flaky DelegatingRenderer test

See issue 822473. I'm just following instructions.

TBR=kylechar@chromium.org


Bug: 822473
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel
Change-Id: If3e84296be13d52bbe3a08b7f744bc785f629142
Reviewed-on: https://chromium-review.googlesource.com/965402
Commit-Queue: Caleb Rouleau <crouleau@chromium.org>
Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543598}

cc/test/layer_tree_test.h

@@ -227,10 +227,11 @@ class LayerTreeTest : public testing::Test, public TestHooks {
   }                                                               \
   class SingleThreadDelegatingImplNeedsSemicolon##TEST_FIXTURE_NAME {}
 
-#define MULTI_THREAD_TEST_F(TEST_FIXTURE_NAME)                   \
-  TEST_F(TEST_FIXTURE_NAME, RunMultiThread_DelegatingRenderer) { \
-    RunTest(CompositorMode::THREADED);                           \
-  }                                                              \
+// TODO(crbug.com/822473): Fix flaky test.
+#define MULTI_THREAD_TEST_F(TEST_FIXTURE_NAME)                            \
+  TEST_F(TEST_FIXTURE_NAME, DISABLED_RunMultiThread_DelegatingRenderer) { \
+    RunTest(CompositorMode::THREADED);                                    \
+  }                                                                       \
   class MultiThreadDelegatingImplNeedsSemicolon##TEST_FIXTURE_NAME {}
 
 #define SINGLE_AND_MULTI_THREAD_TEST_F(TEST_FIXTURE_NAME) \