Mark inspector-protocol/input/dispatchMouseEvent.html as slow on Android.

BUG=673296
TBR=grt@chromium.org

Review-Url: https://codereview.chromium.org/2568793002 .
Cr-Commit-Position: refs/heads/master@{#437857}

third_party/WebKit/LayoutTests/SlowTests

@@ -113,6 +113,7 @@ webkit.org/b/90488 [ Debug ] virtual/mojo-loading/http/tests/inspector/ [ Slow ]
 webkit.org/b/90488 [ Debug ] http/tests/inspector-enabled/ [ Slow ]
 webkit.org/b/90488 [ Debug ] virtual/mojo-loading/http/tests/inspector-enabled/ [ Slow ]
 webkit.org/b/90488 [ Debug ] inspector-protocol/ [ Slow ]
+crbug.com/673296 [ Android ] inspector-protocol/input/dispatchMouseEvent.html [ Slow ]
 crbug.com/451577 inspector/console [ Slow ]
 crbug.com/451577 [ Win ] http/tests/inspector/network/network-datareceived.html [ Slow ]
 crbug.com/451577 [ Win ] virtual/mojo-loading/http/tests/inspector/network/network-datareceived.html [ Slow ]