Improve tablet mode detection on Windows 10+

Improve tablet mode detection on Windows 10+

Merging to M49

This patch introduces the following:-
1. A function IsWindows10TabletMode which uses the new WRL API's on Windows 10 to query the current interaction mode.
   As per msdn these API's can be called from Win32 apps.
   https://msdn.microsoft.com/en-us/library/windows/hardware/dn917883(v=vs.85).aspx
   https://software.intel.com/en-us/articles/detecting-slateclamshell-mode-screen-orientation-in-convertible-pc
   These API's however appear to always return UserModeTouch which indicates tablet mode on the Surface 4 configuration
   I was testing with.

2. If the IsTabletDevice function returns true we don't attempt to detect keyboards and just assume that there is
   no keyboard attached.

BUG=497381
TBR=jschuh

Review URL: https://codereview.chromium.org/1783123003

Cr-Commit-Position: refs/heads/master@{#380864}
(cherry picked from commit d67aae27c1137d077f228d27cae2337d2b8caefa)

Conflicts:
	base/win/win_util.cc

Committed: https://chromium.googlesource.com/chromium/src/+/8097f2b954d27107590d082012c511619350b341

[ananta, 2016-03-22 19:50:28]

Description was changed from

==========
Improve tablet mode detection on Windows 10+

Merging to M49

This patch introduces the following:-
1. A function IsWindows10TabletMode which uses the new WRL API's on Windows 10
to query the current interaction mode.
   As per msdn these API's can be called from Win32 apps.
  
https://msdn.microsoft.com/en-us/library/windows/hardware/dn917883(v=vs.85).aspx
  
https://software.intel.com/en-us/articles/detecting-slateclamshell-mode-scree...
   These API's however appear to always return UserModeTouch which indicates
tablet mode on the Surface 4 configuration
   I was testing with.

2. If the IsTabletDevice function returns true we don't attempt to detect
keyboards and just assume that there is
   no keyboard attached.

BUG=497381

Review URL: https://codereview.chromium.org/1783123003

Cr-Commit-Position: refs/heads/master@{#380864}
(cherry picked from commit d67aae27c1137d077f228d27cae2337d2b8caefa)

Conflicts:
	base/win/win_util.cc
==========

to

==========
Improve tablet mode detection on Windows 10+

Merging to M49

This patch introduces the following:-
1. A function IsWindows10TabletMode which uses the new WRL API's on Windows 10
to query the current interaction mode.
   As per msdn these API's can be called from Win32 apps.
  
https://msdn.microsoft.com/en-us/library/windows/hardware/dn917883(v=vs.85).aspx
  
https://software.intel.com/en-us/articles/detecting-slateclamshell-mode-scree...
   These API's however appear to always return UserModeTouch which indicates
tablet mode on the Surface 4 configuration
   I was testing with.

2. If the IsTabletDevice function returns true we don't attempt to detect
keyboards and just assume that there is
   no keyboard attached.

BUG=497381
TBR=jschuh

Review URL: https://codereview.chromium.org/1783123003

Cr-Commit-Position: refs/heads/master@{#380864}
(cherry picked from commit d67aae27c1137d077f228d27cae2337d2b8caefa)

Conflicts:
	base/win/win_util.cc
==========

[ananta, 2016-03-22 19:50:28]

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

[ananta, 2016-03-22 19:59:26]

Description was changed from

==========
Improve tablet mode detection on Windows 10+

Merging to M49

This patch introduces the following:-
1. A function IsWindows10TabletMode which uses the new WRL API's on Windows 10
to query the current interaction mode.
   As per msdn these API's can be called from Win32 apps.
  
https://msdn.microsoft.com/en-us/library/windows/hardware/dn917883(v=vs.85).aspx
  
https://software.intel.com/en-us/articles/detecting-slateclamshell-mode-scree...
   These API's however appear to always return UserModeTouch which indicates
tablet mode on the Surface 4 configuration
   I was testing with.

2. If the IsTabletDevice function returns true we don't attempt to detect
keyboards and just assume that there is
   no keyboard attached.

BUG=497381
TBR=jschuh

Review URL: https://codereview.chromium.org/1783123003

Cr-Commit-Position: refs/heads/master@{#380864}
(cherry picked from commit d67aae27c1137d077f228d27cae2337d2b8caefa)

Conflicts:
	base/win/win_util.cc
==========

to

==========
Improve tablet mode detection on Windows 10+

Merging to M49

This patch introduces the following:-
1. A function IsWindows10TabletMode which uses the new WRL API's on Windows 10
to query the current interaction mode.
   As per msdn these API's can be called from Win32 apps.
  
https://msdn.microsoft.com/en-us/library/windows/hardware/dn917883(v=vs.85).aspx
  
https://software.intel.com/en-us/articles/detecting-slateclamshell-mode-scree...
   These API's however appear to always return UserModeTouch which indicates
tablet mode on the Surface 4 configuration
   I was testing with.

2. If the IsTabletDevice function returns true we don't attempt to detect
keyboards and just assume that there is
   no keyboard attached.

BUG=497381
TBR=jschuh

Review URL: https://codereview.chromium.org/1783123003

Cr-Commit-Position: refs/heads/master@{#380864}
(cherry picked from commit d67aae27c1137d077f228d27cae2337d2b8caefa)

Conflicts:
	base/win/win_util.cc

Committed:
https://chromium.googlesource.com/chromium/src/+/8097f2b954d27107590d082012c5...
==========

[ananta, 2016-03-22 19:59:27]

Committed patchset #1 (id:1) manually as
8097f2b954d27107590d082012c511619350b341 (presubmit successful).