Fix touchpad zoom on touchscreen Windows devices.

Fix touchpad zoom on touchscreen Windows devices.

TouchPad pinch to zoom on Windows typically works via a WM_MOUSEWHEEL
message with the CONTROL flag in wParam and varying deltas. On touchscreen
Windows devices like Surface, the WM_MOUSEWHEEL event is flagged as a
synthesized message occurring due to a touch.

I think it is safe to allow all WM_MOUSEWHEEL events to be processed by
ignoring the touch flag as they don't appear to get synthesized via
standard touch scrolls.

Changes in this patch are as below:

1. Ignore the touch flag on WM_MOUSEWHEEL and WM_MOUSEHWHEEL messages.
2. Removed dead code in hwnd_message_handler.cc/.h which tried to set
   scroll styles on the window.

BUG=620182
Committed: https://crrev.com/b4480ddac51c6c5e195ca5a14f5ef35a27b9865a
Cr-Commit-Position: refs/heads/master@{#407240}

[ananta, 2016-07-21 23:31:25]

ananta@chromium.org changed reviewers:
+ sky@chromium.org

[ananta, 2016-07-21 23:31:40]

The CQ bit was checked by ananta@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-07-21 23:32:56]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-07-22 01:05:27]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-07-22 01:05:28]

Dry run: Try jobs failed on following builders:
  win_clang on master.tryserver.chromium.win (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.win/builders/win_clang/builds/...)

[ananta, 2016-07-22 01:14:59]

The CQ bit was checked by ananta@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-07-22 01:15:45]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[ananta, 2016-07-22 01:50:25]

The CQ bit was unchecked by ananta@chromium.org

[sky, 2016-07-22 16:21:22]

LGTM

[ananta, 2016-07-22 19:13:02]

The CQ bit was checked by ananta@chromium.org

[commit-bot: I haz the power, 2016-07-22 19:14:20]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-07-22 20:11:10]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-07-22 20:14:11]

Description was changed from

==========
Fix touchpad zoom on touchscreen Windows devices.

TouchPad pinch to zoom on Windows typically works via a WM_MOUSEWHEEL
message with the CONTROL flag in wParam and varying deltas. On touchscreen
Windows devices like Surface, the WM_MOUSEWHEEL event is flagged as a
synthesized message occurring due to a touch.

I think it is safe to allow all WM_MOUSEWHEEL events to be processed by
ignoring the touch flag as they don't appear to get synthesized via
standard touch scrolls.

Changes in this patch are as below:

1. Ignore the touch flag on WM_MOUSEWHEEL and WM_MOUSEHWHEEL messages.
2. Removed dead code in hwnd_message_handler.cc/.h which tried to set
   scroll styles on the window.

BUG=620182
==========

to

==========
Fix touchpad zoom on touchscreen Windows devices.

TouchPad pinch to zoom on Windows typically works via a WM_MOUSEWHEEL
message with the CONTROL flag in wParam and varying deltas. On touchscreen
Windows devices like Surface, the WM_MOUSEWHEEL event is flagged as a
synthesized message occurring due to a touch.

I think it is safe to allow all WM_MOUSEWHEEL events to be processed by
ignoring the touch flag as they don't appear to get synthesized via
standard touch scrolls.

Changes in this patch are as below:

1. Ignore the touch flag on WM_MOUSEWHEEL and WM_MOUSEHWHEEL messages.
2. Removed dead code in hwnd_message_handler.cc/.h which tried to set
   scroll styles on the window.

BUG=620182

Committed: https://crrev.com/b4480ddac51c6c5e195ca5a14f5ef35a27b9865a
Cr-Commit-Position: refs/heads/master@{#407240}
==========

[commit-bot: I haz the power, 2016-07-22 20:14:12]

Patchset 2 (id:??) landed as
https://crrev.com/b4480ddac51c6c5e195ca5a14f5ef35a27b9865a
Cr-Commit-Position: refs/heads/master@{#407240}