Added ImageOnlyFailure for flaky test.
Added ImageOnlyFailure for flaky test.

It has been flaky since 2 days ago:
http://build.chromium.org/p/chromium.webkit/builders/WebKit%20Android%20(Nexus4)/builds/39202

Since I could not figure out the suspected CL for this flakiness, I hope the
owner of svg code can review this.

BUG=541601
TBR=pdr

Review URL: https://codereview.chromium.org/1396683004

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#353307}

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