[tests] Disable tests that are flaky and under investigation

These two tests are flaking on bots.  They appear to be triggering bugs
lower down in the stack being investigated in WEB-32.  This disables
the tests so they don't block commits while the underlying bug is being
investigated.

WEB-32 #comment disable flaking tests

Change-Id: I8f6be5cc85bd2a3bd55462dd8815c2cb7ad52f22
diff --git a/tests/web_runner_tests/BUILD.gn b/tests/web_runner_tests/BUILD.gn
index b93e67b..8351ebc 100644
--- a/tests/web_runner_tests/BUILD.gn
+++ b/tests/web_runner_tests/BUILD.gn
@@ -93,6 +93,7 @@
 
   tests = [
     {
+      is_disabled = true # Disabled due to flake being investigated in WEB-32
       name = "web_runner_integration_tests"
 
       # FLK-148
@@ -107,6 +108,7 @@
       ]
     },
     {
+      is_disabled = true # Disabled due to flake being investigated in WEB-32
       name = "web_runner_pixel_tests"
       environments = [
         {