Set PointerType of pointer event on Windows.

Set PointerType of pointer event on Windows.

Pointer event's PointerType did not set on Windows for mouse type when converting from
ui::MouseEvent to blink::WebMouseEvent.
In WebMouseEventBuilder::Build for Windows, I set the pointer type of WebMouseEvent.

BUG=605639
Review-Url: https://codereview.chromium.org/1993853002
Cr-Commit-Position: refs/heads/master@{#395999}
(cherry picked from commit 8a78e7138f7fce8ce8bfe75803bbf8c33877da9a)

Committed: https://chromium.googlesource.com/chromium/src/+/b8a16ac50c11d9325a4d20dbd617c721d13e180a

[lanwei, 2016-05-27 16:14:05]

Description was changed from

==========
Set PointerType of pointer event on Windows.

Pointer event's PointerType did not set on Windows for mouse type when
converting from
ui::MouseEvent to blink::WebMouseEvent.
In WebMouseEventBuilder::Build for Windows, I set the pointer type of
WebMouseEvent.

BUG=605639

Review-Url: https://codereview.chromium.org/1993853002
Cr-Commit-Position: refs/heads/master@{#395999}
(cherry picked from commit 8a78e7138f7fce8ce8bfe75803bbf8c33877da9a)
==========

to

==========
Set PointerType of pointer event on Windows.

Pointer event's PointerType did not set on Windows for mouse type when
converting from
ui::MouseEvent to blink::WebMouseEvent.
In WebMouseEventBuilder::Build for Windows, I set the pointer type of
WebMouseEvent.

BUG=605639

Review-Url: https://codereview.chromium.org/1993853002
Cr-Commit-Position: refs/heads/master@{#395999}
(cherry picked from commit 8a78e7138f7fce8ce8bfe75803bbf8c33877da9a)

Committed:
https://chromium.googlesource.com/chromium/src/+/b8a16ac50c11d9325a4d20dbd617...
==========

[lanwei, 2016-05-27 16:14:06]

Committed patchset #1 (id:1) manually as
b8a16ac50c11d9325a4d20dbd617c721d13e180a.