Add the Undefined category to ImageSize.

This category would allow dynamic sizing without restriction to other fixed size categories.

Bug: 247595125
Test: Integration Test Demo
Relnote: Add the Undefined category to ImageSize.
Change-Id: I2fa39a9987a4675733003fb5ccee8b0e93f917cf

diff --git a/glance/glance/api/current.txt b/glance/glance/api/current.txt
index 038574a..01c8711 100644
--- a/glance/glance/api/current.txt
+++ b/glance/glance/api/current.txt

@@ -513,9 +513,11 @@
     method public int getLarge();
     method public int getMedium();
     method public int getSmall();
+    method public int getUndefined();
     property public final int Large;
     property public final int Medium;
     property public final int Small;
+    property public final int Undefined;
   }
 
   @kotlin.jvm.JvmInline public final value class ListStyle {

diff --git a/glance/glance/api/public_plus_experimental_current.txt b/glance/glance/api/public_plus_experimental_current.txt
index 038574a..01c8711 100644
--- a/glance/glance/api/public_plus_experimental_current.txt
+++ b/glance/glance/api/public_plus_experimental_current.txt

@@ -513,9 +513,11 @@
     method public int getLarge();
     method public int getMedium();
     method public int getSmall();
+    method public int getUndefined();
     property public final int Large;
     property public final int Medium;
     property public final int Small;
+    property public final int Undefined;
   }
 
   @kotlin.jvm.JvmInline public final value class ListStyle {

diff --git a/glance/glance/api/restricted_current.txt b/glance/glance/api/restricted_current.txt
index 038574a..01c8711 100644
--- a/glance/glance/api/restricted_current.txt
+++ b/glance/glance/api/restricted_current.txt

@@ -513,9 +513,11 @@
     method public int getLarge();
     method public int getMedium();
     method public int getSmall();
+    method public int getUndefined();
     property public final int Large;
     property public final int Medium;
     property public final int Small;
+    property public final int Undefined;
   }
 
   @kotlin.jvm.JvmInline public final value class ListStyle {

diff --git a/glance/glance/src/androidMain/kotlin/androidx/glance/template/GlanceTemplate.kt b/glance/glance/src/androidMain/kotlin/androidx/glance/template/GlanceTemplate.kt
index 2b6996e..c5503e2c 100644
--- a/glance/glance/src/androidMain/kotlin/androidx/glance/template/GlanceTemplate.kt
+++ b/glance/glance/src/androidMain/kotlin/androidx/glance/template/GlanceTemplate.kt

@@ -197,13 +197,13 @@
  *
  * @param images The sequence of images or just one image for display. Default to empty list.
  * @param aspectRatio The preferred aspect ratio of the images. Default to [AspectRatio.Ratio1x1].
- * @param size The preferred size type of the images. Default to [ImageSize.Small].
+ * @param size The preferred size type of the images.
  * @param priority The display priority number relative to other blocks such as a [TextBlock].
  */
 class ImageBlock(
     val images: List<TemplateImageWithDescription> = listOf(),
     val aspectRatio: AspectRatio = AspectRatio.Ratio1x1,
-    val size: ImageSize = ImageSize.Small,
+    val size: ImageSize = ImageSize.Undefined,
     @IntRange(from = 0)
     val priority: Int = 0,
 ) {
@@ -320,19 +320,24 @@
 value class ImageSize private constructor(private val value: Int) {
     companion object {
         /**
+         * Unknown image scale for dynamic sizing by image hosting space available.
+         */
+        val Undefined: ImageSize = ImageSize(0)
+
+        /**
          * Small sized image.
          */
-        val Small: ImageSize = ImageSize(0)
+        val Small: ImageSize = ImageSize(1)
 
         /**
          * Medium sized image.
          */
-        val Medium: ImageSize = ImageSize(1)
+        val Medium: ImageSize = ImageSize(2)
 
         /**
          * Large sized image.
          */
-        val Large: ImageSize = ImageSize(2)
+        val Large: ImageSize = ImageSize(3)
     }
 }