Only set memory tool define if not set.

Only set memory tool define if not set.

This fixes a build issue where MEMORY_TOOL_REPLACES_ALLOCATOR may already be
set.

Committed: https://pdfium.googlesource.com/pdfium/+/1f00dbf0203bdd6b4100457301fef1216546e2f7

[dsinclair, 2016-05-05 17:40:42]

dsinclair@chromium.org changed reviewers:
+ tsepez@chromium.org

[dsinclair, 2016-05-05 17:40:43]

PTAL.

Although, should I actually rename this to PDF_MEMORY... as we maybe enabling it
for other systems now which seems wrong.

[Tom Sepez, 2016-05-05 17:44:11]

LGTM.  It's in a CPP file, so I'm not worried about its scope, and ideally, we'd
like it to be controlled by the same setting as in blink.  We can remove the
definition in a few days once it checks out.

[dsinclair, 2016-05-05 17:45:39]

The CQ bit was checked by dsinclair@chromium.org

[commit-bot: I haz the power, 2016-05-05 17:45:44]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1951383002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1951383002/1

[commit-bot: I haz the power, 2016-05-05 17:57:44]

Description was changed from

==========
Only set memory tool define if not set.

This fixes a build issue where MEMORY_TOOL_REPLACES_ALLOCATOR may already be
set.
==========

to

==========
Only set memory tool define if not set.

This fixes a build issue where MEMORY_TOOL_REPLACES_ALLOCATOR may already be
set.

Committed:
https://pdfium.googlesource.com/pdfium/+/1f00dbf0203bdd6b4100457301fef1216546...
==========

[commit-bot: I haz the power, 2016-05-05 17:57:44]

Committed patchset #1 (id:1) as
https://pdfium.googlesource.com/pdfium/+/1f00dbf0203bdd6b4100457301fef1216546...