Implement TextStyle.fontSize with AbsoluteSizeSpan in framework

Bug: 121157451
Test: ./gradlew ui-port:test
Test: ./gradlew ui-port:connectedAndroidTest
Change-Id: I5b360de03d547e87ba570b73d618f411be3eca7f

diff --git a/ui/port/src/androidTest/java/androidx/ui/port/engine/text/platform/ParagraphAndroidTest.kt b/ui/port/src/androidTest/java/androidx/ui/port/engine/text/platform/ParagraphAndroidTest.kt
index 4885677..27875c02 100644
--- a/ui/port/src/androidTest/java/androidx/ui/port/engine/text/platform/ParagraphAndroidTest.kt
+++ b/ui/port/src/androidTest/java/androidx/ui/port/engine/text/platform/ParagraphAndroidTest.kt

@@ -4,6 +4,7 @@
 import android.graphics.Paint
 import android.graphics.Typeface
 import android.text.TextPaint
+import android.text.style.AbsoluteSizeSpan
 import android.text.style.ForegroundColorSpan
 import androidx.test.filters.SmallTest
 import androidx.test.platform.app.InstrumentationRegistry
@@ -74,7 +75,7 @@
     fun textStyle_setColorOnWholeText() {
         val text = "abcde"
         val fontSize = 20.0
-        val layoutWidth = text.length * fontSize
+        val paragraphWidth = text.length * fontSize
         val textStyle = TextStyle(color = Color(0xFF0000FF.toInt()))
 
         val paragraph = simpleParagraph(
@@ -82,7 +83,7 @@
             textStyles = listOf(ParagraphBuilder.TextStyleIndex(textStyle, 0, text.length)),
             fontSize = fontSize
         )
-        paragraph.layout(layoutWidth)
+        paragraph.layout(paragraphWidth)
 
         assertThat(paragraph.underlyingText, hasSpan(ForegroundColorSpan::class, 0, text.length))
     }
@@ -91,7 +92,7 @@
     fun textStyle_setColorOnPartOfText() {
         val text = "abcde"
         val fontSize = 20.0
-        val layoutWidth = text.length * fontSize
+        val paragraphWidth = text.length * fontSize
         val textStyle = TextStyle(color = Color(0xFF0000FF.toInt()))
 
         val paragraph = simpleParagraph(
@@ -99,7 +100,7 @@
             textStyles = listOf(ParagraphBuilder.TextStyleIndex(textStyle, 0, "abc".length)),
             fontSize = fontSize
         )
-        paragraph.layout(layoutWidth)
+        paragraph.layout(paragraphWidth)
 
         assertThat(paragraph.underlyingText, hasSpan(ForegroundColorSpan::class, 0, "abc".length))
     }
@@ -108,7 +109,7 @@
     fun textStyle_setColorTwice_lastOneOverwrite() {
         val text = "abcde"
         val fontSize = 20.0
-        val layoutWidth = text.length * fontSize
+        val paragraphWidth = text.length * fontSize
         val textStyle = TextStyle(color = Color(0xFF0000FF.toInt()))
         val textStyleOverwrite = TextStyle(color = Color(0xFF00FF00.toInt()))
 
@@ -120,7 +121,7 @@
             ),
             fontSize = fontSize
         )
-        paragraph.layout(layoutWidth)
+        paragraph.layout(paragraphWidth)
 
         assertThat(paragraph.underlyingText, hasSpan(ForegroundColorSpan::class, 0, text.length))
         assertThat(paragraph.underlyingText, hasSpan(ForegroundColorSpan::class, 0, "abc".length))
@@ -130,6 +131,64 @@
         )
     }
 
+    @Test
+    fun textStyle_setFontSizeOnWholeText() {
+        val text = "abcde"
+        val fontSize = 20.0
+        val paragraphWidth = text.length * fontSize
+        val textStyle = TextStyle(fontSize = fontSize)
+
+        val paragraph = simpleParagraph(
+            text = text,
+            textStyles = listOf(ParagraphBuilder.TextStyleIndex(textStyle, 0, text.length))
+        )
+        paragraph.layout(paragraphWidth)
+
+        assertThat(paragraph.underlyingText, hasSpan(AbsoluteSizeSpan::class, 0, text.length))
+    }
+
+    @Test
+    fun textStyle_setFontSizeOnPartText() {
+        val text = "abcde"
+        val fontSize = 20.0
+        val paragraphWidth = text.length * fontSize
+        val textStyle = TextStyle(fontSize = fontSize)
+
+        val paragraph = simpleParagraph(
+            text = text,
+            textStyles = listOf(ParagraphBuilder.TextStyleIndex(textStyle, 0, "abc".length))
+        )
+        paragraph.layout(paragraphWidth)
+
+        assertThat(paragraph.underlyingText, hasSpan(AbsoluteSizeSpan::class, 0, "abc".length))
+    }
+
+    @Test
+    fun textStyle_setFontSizeTwice_lastOneOverwrite() {
+        val text = "abcde"
+        val fontSize = 20.0
+        val fontSizeOverwrite = 30.0
+        val paragraphWidth = text.length * fontSizeOverwrite
+        val textStyle = TextStyle(fontSize = fontSize)
+        val textStyleOverwrite = TextStyle(fontSize = fontSizeOverwrite)
+
+        val paragraph = simpleParagraph(
+            text = text,
+            textStyles = listOf(
+                ParagraphBuilder.TextStyleIndex(textStyle, 0, text.length),
+                ParagraphBuilder.TextStyleIndex(textStyleOverwrite, 0, "abc".length)
+            )
+        )
+        paragraph.layout(paragraphWidth)
+
+        assertThat(paragraph.underlyingText, hasSpan(AbsoluteSizeSpan::class, 0, text.length))
+        assertThat(paragraph.underlyingText, hasSpan(AbsoluteSizeSpan::class, 0, "abc".length))
+        assertThat(
+            paragraph.underlyingText,
+            hasSpanOnTop(AbsoluteSizeSpan::class, 0, "abc".length)
+        )
+    }
+
     private fun simpleParagraph(
         text: CharSequence = "",
         textStyles: List<ParagraphBuilder.TextStyleIndex> = listOf(),