Make Context.getClassLoader() work.

Context.getClassLoader() is used by the LayoutInflater and can be used
by custom views. However, when called from the LayoutInflater, this
needs to return only the Framework classes. This is so that the IDE gets
a chance to instantiate the custom views, which helps in better error
reporting and better fallback in case of exceptions, like MockView.

To workaround this need of the same method returning different results
based on where it's called from, the method call in LayoutInflater is
renamed to getFrameworkClassLoader() and the new method is injected in
Context. The implementation of getFrameworkClassLoader() maintains the
existing behaviour of getClassLoader().

Context.getClassLoader() is now modified to return classes from both
Framework and the app namespace.

Also, update the list of packages to search for Framework views.

Change-Id: I1a6be4aa1fc5c1c5520b5440a348a52f10b6eb3b