Introduce ViewRoot to forward input/view events to native

android_webview/java/src/org/chromium/android_webview/AwContents.java

Index: android_webview/java/src/org/chromium/android_webview/AwContents.java
diff --git a/android_webview/java/src/org/chromium/android_webview/AwContents.java b/android_webview/java/src/org/chromium/android_webview/AwContents.java
index 2d15b2cb5c048e347d8184ba9915e87d335c8e26..f868572acdf78ff9beea53b8581a82c4d16136e4 100644
--- a/android_webview/java/src/org/chromium/android_webview/AwContents.java
+++ b/android_webview/java/src/org/chromium/android_webview/AwContents.java
@@ -77,6 +77,7 @@ import org.chromium.net.NetworkChangeNotifier;
 import org.chromium.ui.base.ActivityWindowAndroid;
 import org.chromium.ui.base.PageTransition;
 import org.chromium.ui.base.ViewAndroidDelegate;
+import org.chromium.ui.base.ViewRoot;
 import org.chromium.ui.base.WindowAndroid;
 import org.chromium.ui.display.DisplayAndroid.DisplayAndroidObserver;
 
@@ -361,6 +362,8 @@ public class AwContents implements SmartClipProvider, PostMessageSender.PostMess
 
     private static String sCurrentLocales = "";
 
+    private ViewRoot mViewRoot;
+
     private static final class AwContentsDestroyRunnable implements Runnable {
         private final long mNativeAwContents;
         // Hold onto a reference to the window (via its wrapper), so that it is not destroyed
@@ -1202,6 +1205,7 @@ public class AwContents implements SmartClipProvider, PostMessageSender.PostMess
             mNativeAwContents = 0;
             mWebContents = null;
             mNavigationController = null;
+            mViewRoot = null;
 
             mCleanupReference.cleanupNow();
             mCleanupReference = null;
@@ -3205,7 +3209,7 @@ public class AwContents implements SmartClipProvider, PostMessageSender.PostMess
             // to enter fixedLayoutSize mode is sent before the first resize
             // update.
             mLayoutSizer.onSizeChanged(w, h, ow, oh);
-            mContentViewCore.onPhysicalBackingSizeChanged(w, h);
+            getViewRoot().onPhysicalBackingSizeChanged(w, h);
             mContentViewCore.onSizeChanged(w, h, ow, oh);
             nativeOnSizeChanged(mNativeAwContents, w, h, ow, oh);
         }
@@ -3281,6 +3285,13 @@ public class AwContents implements SmartClipProvider, PostMessageSender.PostMess
         }
     }
 
+    private ViewRoot getViewRoot() {
+        if (mViewRoot == null) {
+            mViewRoot = nativeGetViewRoot(mNativeAwContents);
+        }
+        return mViewRoot;
+    }
+
     // Return true if the GeolocationPermissionAPI should be used.
     @CalledByNative
     private boolean useLegacyGeolocationPermissionAPI() {
@@ -3384,4 +3395,5 @@ public class AwContents implements SmartClipProvider, PostMessageSender.PostMess
 
     private native void nativeGrantFileSchemeAccesstoChildProcess(long nativeAwContents);
     private native void nativeResumeLoadingCreatedPopupWebContents(long nativeAwContents);
+    private native ViewRoot nativeGetViewRoot(long nativeAwContents);
 }