Adding Dokka source to AOSP

This is taken from commit 4ff3d4153ca344398bffcdaaa28f1a1f6e76f6ad from
https://github.com/google/dokka, which is Google's customized fork of
Dokka (https://github.com/Kotlin/dokka).

Bug: 135767980
Test: ./gradlew :core:cleanTest :core:test
Test: ./gradlew :runners:gradle-integration-tests:clean :runners:gradle-integration-tests:test

Change-Id: I332d0b522706e353c3837f6308aac1a8340d71d3
diff --git a/runners/gradle-integration-tests/testData/androidAppJavadoc/app/src/main/res/values/strings.xml b/runners/gradle-integration-tests/testData/androidAppJavadoc/app/src/main/res/values/strings.xml
new file mode 100644
index 0000000..d8f08bc
--- /dev/null
+++ b/runners/gradle-integration-tests/testData/androidAppJavadoc/app/src/main/res/values/strings.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+
+    <string name="app_name">AndroidSample</string>
+    <string name="action_settings">Settings</string>
+    <string name="hello_world">Hello world!</string>
+    <string name="title_activity_main_activity1">JavaActivity</string>
+    <string name="title_activity_main_activity2">KotlinActivity</string>
+
+</resources>