camera2: Change android.lens.focusRange to Pair<Float,Float>

Since the focus range is defined in diopters (1/distance), it just so
happens that in a range [near, far] near >= far which is against the
android.util.Range contract.

Change it to pair instead.

Also adds a marshaler for Pairs since they didn't have one before
(and aren't parcelable).

Bug: 15335269
Change-Id: If2f3259aeec072438a1c18c1b9728a4c81e92a40
diff --git a/core/java/android/hardware/camera2/impl/CameraMetadataNative.java b/core/java/android/hardware/camera2/impl/CameraMetadataNative.java
index dc0c652..83aee5d 100644
--- a/core/java/android/hardware/camera2/impl/CameraMetadataNative.java
+++ b/core/java/android/hardware/camera2/impl/CameraMetadataNative.java
@@ -31,6 +31,7 @@
 import android.hardware.camera2.marshal.impl.MarshalQueryableEnum;
 import android.hardware.camera2.marshal.impl.MarshalQueryableMeteringRectangle;
 import android.hardware.camera2.marshal.impl.MarshalQueryableNativeByteToInteger;
+import android.hardware.camera2.marshal.impl.MarshalQueryablePair;
 import android.hardware.camera2.marshal.impl.MarshalQueryableParcelable;
 import android.hardware.camera2.marshal.impl.MarshalQueryablePrimitive;
 import android.hardware.camera2.marshal.impl.MarshalQueryableRange;
@@ -1006,6 +1007,7 @@
                 new MarshalQueryableString(),
                 new MarshalQueryableReprocessFormatsMap(),
                 new MarshalQueryableRange(),
+                new MarshalQueryablePair(),
                 new MarshalQueryableMeteringRectangle(),
                 new MarshalQueryableColorSpaceTransform(),
                 new MarshalQueryableStreamConfiguration(),