DialogSurfaceManager implementation.

content/public/android/BUILD.gn

Index: content/public/android/BUILD.gn
diff --git a/content/public/android/BUILD.gn b/content/public/android/BUILD.gn
index 064a397f387925da51ede09a529a0c25d5d3c498..d1c53ffdf497413613fa3da0e286e2196bfbf3c9 100644
--- a/content/public/android/BUILD.gn
+++ b/content/public/android/BUILD.gn
@@ -154,6 +154,9 @@ android_library("content_java") {
     "java/src/org/chromium/content/browser/accessibility/captioning/KitKatCaptioningBridge.java",
     "java/src/org/chromium/content/browser/accessibility/captioning/SystemCaptioningBridge.java",
     "java/src/org/chromium/content/browser/accessibility/captioning/TextTrackSettings.java",
+    "java/src/org/chromium/content/browser/androidoverlay/AndroidOverlayProviderImpl.java",
+    "java/src/org/chromium/content/browser/androidoverlay/DialogAndroidOverlay.java",
+    "java/src/org/chromium/content/browser/androidoverlay/DialogAndroidOverlayCore.java",
     "java/src/org/chromium/content/browser/crypto/ByteArrayGenerator.java",
     "java/src/org/chromium/content/browser/crypto/CipherFactory.java",
     "java/src/org/chromium/content/browser/framehost/NavigationControllerImpl.java",
@@ -330,6 +333,7 @@ generate_jni("content_jni_headers") {
     "java/src/org/chromium/content/browser/SpeechRecognition.java",
     "java/src/org/chromium/content/browser/TracingControllerAndroid.java",
     "java/src/org/chromium/content/browser/accessibility/BrowserAccessibilityManager.java",
+    "java/src/org/chromium/content/browser/androidoverlay/DialogAndroidOverlay.java",
     "java/src/org/chromium/content/browser/framehost/NavigationControllerImpl.java",
     "java/src/org/chromium/content/browser/input/DateTimeChooserAndroid.java",
     "java/src/org/chromium/content/browser/input/HandleViewResources.java",