InputDispatcher: Optimize count()

Count items as they are added and removed rather than iterating over the
entire list to count them.

Increases performance slightly, particularly when tracing is turned on,
which causes count to be queried more often, and when the number of
items in the queues grow large.  This can happen due to applications not
responding, for example.

Change-Id: I0f11f7edd46089612af910cdfabfeb3ee685d7d9
Signed-off-by: Chet Kener <Cl3Kener@gmail.com>
native: Restore VM memory overrides

This change adds back the property overrides for several device
types as we had in CM 11.

It contains a squished commit of the following:

commit 5b9240927f8af0b26c406835df33b2d999496434
Author: Steve Kondik <shade@chemlab.org>
Date:   Thu Nov 6 14:40:44 2014 -0800

    Add hdpi-2048 tunings

commit ed579d8be17fb52ef92a1dc9c83843879f396fa1
Author: Steve Kondik <shade@chemlab.org>
Date:   Sat Jan 4 12:12:00 2014 -0800

    Update HWUI config for xxhdpi/2GB devices

commit 386f220e174f9ed5aad487867223033fd5d986c6
Author: Steve Kondik <shade@chemlab.org>
Date:   Tue Aug 6 02:53:19 2013 -0700

    hwui: Update configuration for 2GB/1080p devices

commit b7392d113d8ae6c3c07990bbb3f2621bef490d11
Author: Steve Kondik <shade@chemlab.org>
Date:   Sat Jun 1 14:51:17 2013 +0200

    provide overrides for hwui memory limits for xxhdpi phones

commit 247b3c635b1d6776ffedf3cd61a936546c2f6603
Author: Steve Kondik <shade@chemlab.org>
Date:   Fri May 17 13:10:19 2013 -0700

    Add heap configuration for 1080p phones with 2048m

     * Increase heap start size to 16m to minimize GC with larger bitmaps

commit 9856e93970fd6def1349e564f17d42f505904eba
Author: Andrew Bartholomew <andrewb03@gmail.com>
Date:   Thu Apr 25 13:48:21 2013 -0400

    build/phone-xhdpi-1024-dalvik-heap.mk Revert AOSP heapgrowthlimit change from 64 to 96

    This reverts part of AOSP change at

    https://android.googlesource.com/platform/frameworks/native/+/c84e9844d621223d14178be521

    Possible performance issues have arisen because of it. Discussion at

    http://code.google.com/p/android/issues/detail?id=40961

    Patch Set 2: Clean up commit message

commit bd7fb4be323f6f868a886b22e93cf203944af9a6
Author: Bhargav Upperla <bhargavuln@codeaurora.org>
Date:   Thu May 23 12:50:15 2013 -0700

    Configure dalvik heap parameters for low memory devices

    Reduces after boot memory footprint by about 5-8MB
    Note: This is for low memory based devices only (~512MB RAM
    or less)

Change-Id: Id7e1967d18227359ad9631139bfd47e61e494829
Signed-off-by: Chet Kener <Cl3Kener@gmail.com>