SurfaceFlinger: Combine SF Refactor changes.

The following commits are included in this:

ExSurfaceFlinger: Preserve layer pixel format for VDS

Preserve VDS layer pixel format during writeback based
on GRALLOC flags.
Change-Id: Ia057ddbed6e76b8c78ba37a3be48bf7eed1da471
CRs-Fixed: 2178626

SF: Allow HDR for GPU fall back under certain conditions

When HWC is disabled or when the property "sys.hwc_disable_hdr"
is set, allow the HDR videos to fall back to GPU.
CRs-Fixed: 1114849
Change-Id: I7cfb5654946299c6dd3d6b40e387aa999d9bd047

SurfaceFlinger: Avoid HDR layers going to GPU

The HDR layers when fall back to GPU, show differently due to missing
tonemapping in fall back path, hence avoid those layers going to GPU.
CRs-Fixed: 1094808
Change-Id: I68072f9a04042fd011c53ecddf9ca22c1507fa12

SF: Disable dimlayer for WFD direct streaming.

Use gralloc flags to detect WFD direct streaming case
and disable composition of dim layers.
Change-Id: I654461c8a521184c30dc7a04a4258f353b5edaf6
CRs-Fixed: 2094644

sf: vds: Avoid HWC for certain scenarios

Reserve HWC for VDS for WFD use case. During WFD usecase, sink usage
will contain GRALLOC_USAGE_PRIVATE_WFD flag.
When HWC is avoided, all virtual displays are composed using GLES.
This means that GLES composes directly into the sink buffer and
signals the consumer. Furthermore, it is expected that any color
conversion will be handled on the consumer side.
Change-Id: I93ff54c79ece788b6caf3f4172835d8ac1362f62
CRs-Fixed: 908380

SurfaceFlinger: Add support for DisplayUtils
Add DisplayUtils class which uses the custom implementations
of ExLayer, ExSurfaceFlinger, ExHWComposer,
and ExVirtualDisplaySurface classes if needed
Change-Id: Ibdd8da5d3d0d602f42b76a15d0994c6aa98bee3f

SurfaceFlinger: Move Extended SF classes to same repository
Move the ExSurfaceFlinger, ExLayer, etc., classes to this
repository, to avoid dependency accross projects with static
linking

commit 04f501b31f627e47ae540b5160b2f86b7adbd921
Author: Baldev Sahu <bsahu@codeaurora.org>
Date:   Wed Nov 25 18:05:51 2015 +0530

display-fw: Properly initialise mIsGPUAllowedForProtected flag
- This flag need to be initialize to false when layer is
  created.
Change-Id: Ie3df40ffc4240c33883f19ecbef6428f7c539b07
CRs-fixed: 942102

commit f687ac25b3482b92da3c252d29b65e850cca3ce1
Author: Arun Kumar K.R <akumarkr@codeaurora.org>
Date:   Thu Oct 15 16:37:11 2015 -0700
display-frameworks: Include libqdutils
only for target builds
Featurize including libqdutils for targets which uses QCOM_BSP,
helps in resolving compilation for emulator builds
Change-Id: I39639c3100eb20dd24d2a875bb0e9bc82d2b2d1f

commit 6998bbdfd7af3126b64897b16b6961e84952601b
Author: Baldev Sahu <bsahu@codeaurora.org>
Date:   Thu Jul 30 16:01:15 2015 +0530
display-frameworks: Extend support for MDP3
- Add support for HWC_BLIT
- Allow GPU to compose widevine level 3
Change-Id:I11e03ccd0842d019e85d0c29bc5b7be559fccbaa

commit 2fa7aa1684c0162b8226c4327c86c6eaf6b76101
Author: Manoj Kumar <manoj@codeaurora.org>
Date:   Thu Aug 20 13:52:15 2015 -0700
display-frameworks: Override mOutputUsage with sink Usage flags
mOutputUsage flags contain default usage flags and doesnt reflect
sink usage flags. Override mOutputUsage with sink usage flags.
This change is needed to support WFD Secure usecase.
Change-Id: I14d8812049f635a8ebe6a944783e0ec7f8f80b1f

commit 09da768794c8c6acd786d73239ed5a739695b8cb
Author: Raj Kamal <rkamal@codeaurora.org>
Date:   Mon Jul 20 10:46:27 2015 +0530
display-frameworks: Extend the classes defined in SF
Add support for custom classes ExSurfaceFlinger,
ExLayer, ExHWComposer and ExVirtualDisplaySurface
Change-Id: Iab8c4835faaad9b436bbd34d38702741eb0cf12d
Change-Id: Ie400c94ccc77fc379ffa256af03a9e42ba5decaa
SurfaceFlinger: Disable rotation animation on Secondary displays
- Add support to set animating layer for HWCLayers
- After hwc_prepare, dont override the compType of a layer to
  HWC_FRAMEBUFFER if its for non-primary displays
CRs-fixed: 922304
Change-Id: Iac462778ce5fb9016290846146e62f80dcfafd5c

sf: ex-sf: Remove screenshot surface from secondary displays
- When rotation animation is disabled on secondary displays, remove
  the screenshot surface from the secondary display list, without
  this it would show up upside down frame on secondary.
- Mark IntOnly layers as invisible on secondary displays.
Change-Id: Ia859ee1c6ac7caa132c95e4f906bd2589e786fac
CRs-fixed: 949263

sf: Clear visible region of layer appropriately.
Clear visible region of layer having layer stack id different than
the display layer stack id to ensure that the layer won't be present
on the wrong display layer list.
Change-Id: I59289fea63ec7a2451d4715cfe7926ba34fdb8e3

Change-Id: Ib7ef7ce9ae68ae2246c1c9bfbce342d9b5d06621