It's looking like this test is flaky, not failing consistently. I've added it to TestExpectations with [ Failure Pass ].

Assigning to vmpstr, suspecting https://codereview.chromium.org/2361263003.

vmpstr: Could you please look into this?

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/6627690b67a76fe6843c720890d9d8e8da191097

commit 6627690b67a76fe6843c720890d9d8e8da191097
Author: suzyh <suzyh@chromium.org>
Date: Wed Nov 16 08:41:35 2016

Disable failing webp-partial-load test

webkit_tests failing on 4 builders

Type: webkit_tests failing on http/tests/images/webp-partial-load.html

Builders failed on:
- WebKit Mac10.10:
  https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Mac10.10
- WebKit Mac10.11:
  https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Mac10.11
- WebKit Mac10.11 (dbg):
  https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Mac10.11%20%28dbg%29
- WebKit Win10:
  https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Win10

BUG= 665760 
NOTRY=true
TBR=horo@chromium.org,tansell@chromium.org

Review-Url: https://codereview.chromium.org/2508813002
Cr-Commit-Position: refs/heads/master@{#432433}

[modify] https://crrev.com/6627690b67a76fe6843c720890d9d8e8da191097/third_party/WebKit/LayoutTests/TestExpectations

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/832ee36d176aeb180e25314e014cf3092646a009

commit 832ee36d176aeb180e25314e014cf3092646a009
Author: vmpstr <vmpstr@chromium.org>
Date: Thu Nov 17 00:23:39 2016

LayoutTests: Update webp-partial-load.html to wait longer.

This patch ensures that we wait a bit longer for the flush timer to
fire on another image-stalls-after-a-while-test.

R=chrishtr@chromium.org
BUG= 665760 

Review-Url: https://codereview.chromium.org/2505073003
Cr-Commit-Position: refs/heads/master@{#432675}

[modify] https://crrev.com/832ee36d176aeb180e25314e014cf3092646a009/third_party/WebKit/LayoutTests/TestExpectations
[modify] https://crrev.com/832ee36d176aeb180e25314e014cf3092646a009/third_party/WebKit/LayoutTests/http/tests/images/webp-partial-load.html