Confirmed that this is multidex locally.

For some reason, the test-multidex keeps getting nuked during execution, so we have to extract the secondary dexes in *each* test. :(

This is https://codesearch.chromium.org/chromium/src/chrome/test/android/javatests/src/org/chromium/chrome/test/util/ApplicationData.java?rcl=3531cd6ab4ee74146c2a0fd834a54c71c9c4178f&l=40, which currently deletes both the directory into which we extract secondary dexes and the SharedPreferences that MultiDex uses to save the hashes of dex files it has extracted. This issue isn't new -- it likely has been affecting debug builds of chrome_public_test_apk, where the app is multidex, for a while -- but it is newly affecting the trybots.

https://codereview.chromium.org/2854503002/ contains a fix.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/039ec1ad2eaec6f13bfdda8cb3ac5e5d8cdc32b3

commit 039ec1ad2eaec6f13bfdda8cb3ac5e5d8cdc32b3
Author: jbudorick <jbudorick@chromium.org>
Date: Mon May 01 18:13:03 2017

[Android] Keep extracted secondary dex files when clearing data in tests.

BUG= 716029 

Review-Url: https://codereview.chromium.org/2854503002
Cr-Commit-Position: refs/heads/master@{#468356}

[modify] https://crrev.com/039ec1ad2eaec6f13bfdda8cb3ac5e5d8cdc32b3/base/BUILD.gn
[modify] https://crrev.com/039ec1ad2eaec6f13bfdda8cb3ac5e5d8cdc32b3/base/test/android/javatests/src/org/chromium/base/test/BaseChromiumRunnerCommon.java
[modify] https://crrev.com/039ec1ad2eaec6f13bfdda8cb3ac5e5d8cdc32b3/chrome/test/android/BUILD.gn
[modify] https://crrev.com/039ec1ad2eaec6f13bfdda8cb3ac5e5d8cdc32b3/chrome/test/android/javatests/src/org/chromium/chrome/test/util/ApplicationData.java

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/36e4d367d46aa8da9c8e29e66388f6368d68fca7

commit 36e4d367d46aa8da9c8e29e66388f6368d68fca7
Author: jbudorick <jbudorick@chromium.org>
Date: Mon May 01 22:35:55 2017

Revert of [Android] Keep extracted secondary dex files when clearing data in tests. (patchset #2 id:20001 of https://codereview.chromium.org/2854503002/ )

Reason for revert:
primary suspect for  crbug.com/717267 

Original issue's description:
> [Android] Keep extracted secondary dex files when clearing data in tests.
>
> BUG= 716029 
>
> Review-Url: https://codereview.chromium.org/2854503002
> Cr-Commit-Position: refs/heads/master@{#468356}
> Committed: https://chromium.googlesource.com/chromium/src/+/039ec1ad2eaec6f13bfdda8cb3ac5e5d8cdc32b3

TBR=agrieve@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG= 716029 

Review-Url: https://codereview.chromium.org/2849323002
Cr-Commit-Position: refs/heads/master@{#468460}

[modify] https://crrev.com/36e4d367d46aa8da9c8e29e66388f6368d68fca7/base/BUILD.gn
[modify] https://crrev.com/36e4d367d46aa8da9c8e29e66388f6368d68fca7/base/test/android/javatests/src/org/chromium/base/test/BaseChromiumRunnerCommon.java
[modify] https://crrev.com/36e4d367d46aa8da9c8e29e66388f6368d68fca7/chrome/test/android/BUILD.gn
[modify] https://crrev.com/36e4d367d46aa8da9c8e29e66388f6368d68fca7/chrome/test/android/javatests/src/org/chromium/chrome/test/util/ApplicationData.java

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/73357e2349014d7638b891070dc5d557e78f87fa

commit 73357e2349014d7638b891070dc5d557e78f87fa
Author: jbudorick <jbudorick@chromium.org>
Date: Tue May 02 18:59:06 2017

[Android] Keep extracted secondary dex files when clearing data in tests. (RELAND)

BUG= 716029 

Review-Url: https://codereview.chromium.org/2853003003
Cr-Commit-Position: refs/heads/master@{#468728}

[modify] https://crrev.com/73357e2349014d7638b891070dc5d557e78f87fa/base/BUILD.gn
[modify] https://crrev.com/73357e2349014d7638b891070dc5d557e78f87fa/base/test/android/javatests/src/org/chromium/base/test/BaseChromiumRunnerCommon.java
[modify] https://crrev.com/73357e2349014d7638b891070dc5d557e78f87fa/build/android/main_dex_classes.flags
[modify] https://crrev.com/73357e2349014d7638b891070dc5d557e78f87fa/chrome/test/android/BUILD.gn
[modify] https://crrev.com/73357e2349014d7638b891070dc5d557e78f87fa/chrome/test/android/javatests/src/org/chromium/chrome/test/util/ApplicationData.java

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/76829422650ba99655e67f7f3c2b8589bdc5438b

commit 76829422650ba99655e67f7f3c2b8589bdc5438b
Author: John Budorick <jbudorick@chromium.org>
Date: Fri May 05 22:42:55 2017

[Android] Keep extracted secondary dex files when clearing data in tests. (RELAND)

cherry pick to M59

BUG= 716029 

(cherry picked from commit 73357e2349014d7638b891070dc5d557e78f87fa)

Review-Url: https://codereview.chromium.org/2861273002 .
Cr-Commit-Position: refs/branch-heads/3071@{#427}
Cr-Branched-From: a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}

[modify] https://crrev.com/76829422650ba99655e67f7f3c2b8589bdc5438b/base/BUILD.gn
[modify] https://crrev.com/76829422650ba99655e67f7f3c2b8589bdc5438b/base/test/android/javatests/src/org/chromium/base/test/BaseChromiumRunnerCommon.java
[modify] https://crrev.com/76829422650ba99655e67f7f3c2b8589bdc5438b/build/android/main_dex_classes.flags
[modify] https://crrev.com/76829422650ba99655e67f7f3c2b8589bdc5438b/chrome/test/android/BUILD.gn
[modify] https://crrev.com/76829422650ba99655e67f7f3c2b8589bdc5438b/chrome/test/android/javatests/src/org/chromium/chrome/test/util/ApplicationData.java