Refactor testing APIs to the final proposal.

Bug: 161116353
Test: N/A
Relnote: "Several testing APIs were renamed to be more intuitive. All
findXYZ APIs were renamed to onNodeXYZ. All doXYZ APIs were renamed to
performXYZ."

Change-Id: I7f164b42b04196f023c4a2153d66825487998de4

diff --git a/ui/ui-material/src/androidTest/java/androidx/ui/material/ripple/RippleIndicationTest.kt b/ui/ui-material/src/androidTest/java/androidx/ui/material/ripple/RippleIndicationTest.kt
index d52810d..8b8ed07 100644
--- a/ui/ui-material/src/androidTest/java/androidx/ui/material/ripple/RippleIndicationTest.kt
+++ b/ui/ui-material/src/androidTest/java/androidx/ui/material/ripple/RippleIndicationTest.kt

@@ -51,7 +51,7 @@
 import androidx.ui.test.ComposeTestRule
 import androidx.ui.test.captureToBitmap
 import androidx.ui.test.createComposeRule
-import androidx.ui.test.findByTag
+import androidx.ui.test.onNodeWithTag
 import androidx.ui.test.runOnUiThread
 import androidx.ui.test.waitForIdle
 import androidx.ui.unit.dp
@@ -529,7 +529,7 @@
             interactionState.addInteraction(Interaction.Pressed, Offset(10f, 10f))
         }
 
-        with(findByTag(Tag)) {
+        with(onNodeWithTag(Tag)) {
             val centerPixel = captureToBitmap()
                 .run {
                     getPixel(width / 2, height / 2)
@@ -548,7 +548,7 @@
             rippleTheme = createRippleTheme(newColor, newAlpha)
         }
 
-        with(findByTag(Tag)) {
+        with(onNodeWithTag(Tag)) {
             val centerPixel = captureToBitmap()
                 .run {
                     getPixel(width / 2, height / 2)
@@ -594,7 +594,7 @@
         composeTestRule.clockTestRule.advanceClock(50)
 
         // Capture and compare screenshots
-        findByTag(Tag)
+        onNodeWithTag(Tag)
             .captureToBitmap()
             .assertAgainstGolden(screenshotRule, goldenIdentifier)
 
@@ -604,7 +604,7 @@
         waitForIdle()
 
         // Compare expected and actual pixel color
-        val centerPixel = findByTag(Tag)
+        val centerPixel = onNodeWithTag(Tag)
             .captureToBitmap()
             .run {
                 getPixel(width / 2, height / 2)