Introduced WindowContainer.mConsumerWrapperPool

WindowContainer.forAllWindows(Consumer<WindowState>...) requires a lambda
to be allocated each time it is called since we need to capture the callback.
Switched to using an object pool for the process to reduce allocations.

Test: Run the allocation traker and make sure there aren't lambda allocations
      for WindowContainer.forAllWindows() method.
Change-Id: If49c1b0bd2e0a5d6d7a30ff686b5235e69a61750