Add mouse wheel event handler to HostWindow

Based on a patch by Teppo Pennanen <teppo.pennanen@palm.com>

Open-webOS-DCO-1.0-Signed-off-by: Teppo Pennanen <teppo.pennanen@palm.com>
Open-webOS-DCO-1.0-Signed-off-by: Jose Dapena Paz <jose.dapena@palm.com>

Change-Id: I41f0112199b9a8fedef05a4a86f17bf46d46c11b
Add mouse hover support in CardHostWindow

Open-webOS-DCO-1.0-Signed-off-by: Jose Dapena Paz <jose.dapena@palm.com>

Change-Id: Ia4800f621bfb937bc92114455c8437bea70c6648
Merge "Add mouse wheel event handler to HostWindow"
Merge "Add mouse hover support in CardHostWindow"