Reland of Use visual studio toolchain from depot_tools for PDFium compilation

Reland of Use visual studio toolchain from depot_tools for PDFium compilation (patchset #1 id:1 of https://codereview.chromium.org/1922373003/ )

Reason for revert:
I fixed Clang build config, and updated drm binary. Should work this time.

Original issue's description:
> Revert of Use visual studio toolchain from depot_tools for PDFium compilation (patchset #3 id:40001 of https://codereview.chromium.org/1897523002/ )
> 
> Reason for revert:
> Clang build is broken. drm build has some problem. Will revert this change for now.
> 
> Original issue's description:
> > Use visual studio toolchain from depot_tools for PDFium compilation
> > 
> > Change to use visual studio toolchain from depot_tools by default.
> > Setting DEPOT_TOOLS_WIN_TOOLCHAIN=0 allows compilation using system
> > toolchain as before.
> > 
> > Using toolchain from depot_tools unifies the compilation
> > environment, and brings the benefits of automated update, bug fixes
> > etc.
> > 
> > Committed: https://pdfium.googlesource.com/pdfium/+/590f2d9e057a0d5b17a9706affd3c6115265021b
> 
> TBR=brucedawson@chromium.org,thestig@chromium.org,tsepez@chromium.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> 
> Committed: https://pdfium.googlesource.com/pdfium/+/df96690d4e3799536b981e3673d64018fa5fd037

TBR=brucedawson@chromium.org,thestig@chromium.org,tsepez@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Committed: https://pdfium.googlesource.com/pdfium/+/9a1b665f8a6762927b7fa4fb9c812f00e8d3135e

[Wei Li, 2016-04-28 22:26:28]

Created Reland of Use visual studio toolchain from depot_tools for PDFium
compilation

[commit-bot: I haz the power, 2016-04-28 22:26:38]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1927373002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1927373002/1

[commit-bot: I haz the power, 2016-04-28 22:26:47]

Description was changed from

==========
Reland of Use visual studio toolchain from depot_tools for PDFium compilation
(patchset #1 id:1 of https://codereview.chromium.org/1922373003/ )

Reason for revert:
I fixed Clang build config, and updated drm binary. Should work this time.

Original issue's description:
> Revert of Use visual studio toolchain from depot_tools for PDFium compilation
(patchset #3 id:40001 of https://codereview.chromium.org/1897523002/ )
> 
> Reason for revert:
> Clang build is broken. drm build has some problem. Will revert this change for
now.
> 
> Original issue's description:
> > Use visual studio toolchain from depot_tools for PDFium compilation
> > 
> > Change to use visual studio toolchain from depot_tools by default.
> > Setting DEPOT_TOOLS_WIN_TOOLCHAIN=0 allows compilation using system
> > toolchain as before.
> > 
> > Using toolchain from depot_tools unifies the compilation
> > environment, and brings the benefits of automated update, bug fixes
> > etc.
> > 
> > Committed:
https://pdfium.googlesource.com/pdfium/+/590f2d9e057a0d5b17a9706affd3c6115265...
> 
> TBR=brucedawson@chromium.org,thestig@chromium.org,tsepez@chromium.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> 
> Committed:
https://pdfium.googlesource.com/pdfium/+/df96690d4e3799536b981e3673d64018fa5f...

TBR=brucedawson@chromium.org,thestig@chromium.org,tsepez@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
==========

to

==========
Reland of Use visual studio toolchain from depot_tools for PDFium compilation
(patchset #1 id:1 of https://codereview.chromium.org/1922373003/ )

Reason for revert:
I fixed Clang build config, and updated drm binary. Should work this time.

Original issue's description:
> Revert of Use visual studio toolchain from depot_tools for PDFium compilation
(patchset #3 id:40001 of https://codereview.chromium.org/1897523002/ )
> 
> Reason for revert:
> Clang build is broken. drm build has some problem. Will revert this change for
now.
> 
> Original issue's description:
> > Use visual studio toolchain from depot_tools for PDFium compilation
> > 
> > Change to use visual studio toolchain from depot_tools by default.
> > Setting DEPOT_TOOLS_WIN_TOOLCHAIN=0 allows compilation using system
> > toolchain as before.
> > 
> > Using toolchain from depot_tools unifies the compilation
> > environment, and brings the benefits of automated update, bug fixes
> > etc.
> > 
> > Committed:
https://pdfium.googlesource.com/pdfium/+/590f2d9e057a0d5b17a9706affd3c6115265...
> 
> TBR=brucedawson@chromium.org,thestig@chromium.org,tsepez@chromium.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> 
> Committed:
https://pdfium.googlesource.com/pdfium/+/df96690d4e3799536b981e3673d64018fa5f...

TBR=brucedawson@chromium.org,thestig@chromium.org,tsepez@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Committed:
https://pdfium.googlesource.com/pdfium/+/9a1b665f8a6762927b7fa4fb9c812f00e8d3...
==========

[commit-bot: I haz the power, 2016-04-28 22:26:48]

Committed patchset #1 (id:1) as
https://pdfium.googlesource.com/pdfium/+/9a1b665f8a6762927b7fa4fb9c812f00e8d3...

[brucedawson, 2016-04-28 23:26:06]

On 2016/04/28 22:26:48, commit-bot: I haz the power wrote:
> Committed patchset #1 (id:1) as
>
https://pdfium.googlesource.com/pdfium/+/9a1b665f8a6762927b7fa4fb9c812f00e8d3...

Remember that a clobber is needed. Otherwise files will be rebuilt with the new
compiler piecemeal, and mixing and matching is not supported.