libdvr: Add performance API to platform library.

- Add dvrPerformanceSetSchedulerPolicy API. Only this API is exposed
  through the DVR platform library, the older API will be deprecated.
- Add permission checks to all performanced APIs.
- Allow services with android.permission.RESTRICTED_VR_ACCESS to change
  scheduler policy for VR apps.
- Minor updates to use the updated PDX service API. The older API will
  be deprecated soon.
- Add tests for permission checks and policy API.

Most of the tests are automatic however, there is one manual step for
testing the android.permission.RESTRICTED_VR_ACCESS (e.g. trusted uid)
check. Because there is no reliable way to determine the UID of VrCore
from the gtest, instead the gtest looks for an env var named
GTEST_TRUSTED_UID; if this is set the value is used as a uid and the
trusted uid tests are enabled.

Bug: 62468109
Test: 'GTEST_TRUSTED_UID=<VrCore UID> performance_service_tests' passes.
Change-Id: I9047b298a015a69535b655a299ca26c179e2d57d
diff --git a/libs/vr/libdvr/Android.bp b/libs/vr/libdvr/Android.bp
index 4041d6b..7fe9825 100644
--- a/libs/vr/libdvr/Android.bp
+++ b/libs/vr/libdvr/Android.bp
@@ -31,6 +31,7 @@
     "dvr_configuration_data.cpp",
     "dvr_display_manager.cpp",
     "dvr_hardware_composer_client.cpp",
+    "dvr_performance.cpp",
     "dvr_surface.cpp",
     "dvr_vsync.cpp",
 ]
@@ -45,6 +46,7 @@
     "libvr_hwc-impl",
     "libvr_hwc-binder",
     "libgrallocusage",
+    "libperformance",
     "libpdx_default_transport",
 ]