Support loading non system cursors in Chrome AURA/ASH windows.

This is mostly intended to support special cursors passed by Webkit like the middle scroll panning cursor, etc.
On Windows AURA the code to load the platform cursor is implemented in CursorLoaderWin, which attempts to
load the cursor via the LoadCursor API always passing NULL as the module handle. This would not work for non
system cursors.

To enable support for the same added support to pass the cursor module name in the Cursor interfaces for AURA.
These include the following:-
1. CursorClient
2. CursorLoader
3. NativeCursorManager

Added a method SetCursorResourceModule to these interfaces. The NativeCursorManager is registered as the cursor client
in AURA/ASH. It forwards calls to the CursorClient which then forwards the calls over to the CursorLoader.

For ASH, I added a SetCursorResourceModule method to the ImageCursor class used by ASH.

We pass the resource dll name from RenderWidgetHostViewAura::UpdateCursorIfOverSelf method. 

Added code in the CursorLoaderWin::SetPlatformCursor function to use the platform cursor from the passed in cursor if
available, as the resource dll name may not be available to all cursor clients.

BUG=176079
Review URL: https://codereview.chromium.org/12903002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@188911 0039d316-1c4b-4281-b951-d872f2087c98

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