Add EventForwarder for routing touch events

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 e1b0a4027bbd73d1a8932dd063ebb55229898997..ffba67a1f04adff440ec0f4249a73a7c7accc439 100644
--- a/content/public/android/BUILD.gn
+++ b/content/public/android/BUILD.gn
@@ -130,6 +130,7 @@ android_library("content_java") {
     "java/src/org/chromium/content/browser/ContentViewStatics.java",
     "java/src/org/chromium/content/browser/ContextualSearchClient.java",
     "java/src/org/chromium/content/browser/DeviceUtils.java",
+    "java/src/org/chromium/content/browser/EventForwarderImpl.java",
     "java/src/org/chromium/content/browser/FloatingActionModeCallback.java",
     "java/src/org/chromium/content/browser/InterfaceRegistrarImpl.java",
     "java/src/org/chromium/content/browser/InterstitialPageDelegateAndroid.java",
@@ -215,6 +216,7 @@ android_library("content_java") {
     "java/src/org/chromium/content_public/browser/AccessibilitySnapshotNode.java",
     "java/src/org/chromium/content_public/browser/ActionModeCallbackHelper.java",
     "java/src/org/chromium/content_public/browser/ContentBitmapCallback.java",
+    "java/src/org/chromium/content_public/browser/EventForwarder.java",
     "java/src/org/chromium/content_public/browser/GestureStateListener.java",
     "java/src/org/chromium/content_public/browser/ImageDownloadCallback.java",
     "java/src/org/chromium/content_public/browser/InterfaceRegistrar.java",
@@ -324,6 +326,7 @@ generate_jni("content_jni_headers") {
     "java/src/org/chromium/content/browser/ContentViewCore.java",
     "java/src/org/chromium/content/browser/ContentViewRenderView.java",
     "java/src/org/chromium/content/browser/ContentViewStatics.java",
+    "java/src/org/chromium/content/browser/EventForwarderImpl.java",
     "java/src/org/chromium/content/browser/InterfaceRegistrarImpl.java",
     "java/src/org/chromium/content/browser/InterstitialPageDelegateAndroid.java",
     "java/src/org/chromium/content/browser/MediaResourceGetter.java",