[Chromecast] Disable flaky LayerTreeHostTilesTestPartialInvalidation*

Bug: 767080
Bug: internal b/65844132
Change-Id: Id0d1280e7ff202b2541a54077ee4df459a5dc62a
Reviewed-on: https://chromium-review.googlesource.com/676464Reviewed-by: Stephen Lanham <slan@chromium.org>
Commit-Queue: Luke Halliwell <halliwell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#503625}

chromecast/BUILD.gn

@@ -193,9 +193,11 @@ cast_test_group("cast_tests") {
     if (!is_cast_desktop_build) {
       #Disable ToColorSpace/ColorTransformPixelTest*  (b/64346790)
       #Disable ImageBackgroundFilter* (b/64346875)
+      #Disable LayerTreeHostTilesTestPartialInvalidation* (b/65844132)
       gtest_excludes = [
         "ToColorSpace/ColorTransformPixelTest.*",
         "ImageBackgroundFilter.*",
+        "LayerTreeHostTilesTestPartialInvalidation.*",
       ]
     }
   }