Introduce ViewRoot forwarding 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 f868572acdf78ff9beea53b8581a82c4d16136e4..5b34b65c23fbeb669ae182e2425197c399a0eaa6 100644
--- a/android_webview/java/src/org/chromium/android_webview/AwContents.java
+++ b/android_webview/java/src/org/chromium/android_webview/AwContents.java
@@ -812,8 +812,9 @@ public class AwContents implements SmartClipProvider, PostMessageSender.PostMess
             Context context, ViewAndroidDelegate viewDelegate,
             InternalAccessDelegate internalDispatcher, WebContents webContents,
             GestureStateListener gestureStateListener, ContentViewClient contentViewClient,
-            WindowAndroid windowAndroid) {
-        contentViewCore.initialize(viewDelegate, internalDispatcher, webContents, windowAndroid);
+            WindowAndroid windowAndroid, ViewRoot viewRoot) {
+        contentViewCore.initialize(viewDelegate, internalDispatcher, webContents, windowAndroid,
+                viewRoot);
         contentViewCore.setActionModeCallback(
                 new AwActionModeCallback(mContext, this,
                         contentViewCore.getActionModeCallbackHelper()));
@@ -1056,9 +1057,10 @@ public class AwContents implements SmartClipProvider, PostMessageSender.PostMess
         mContentViewCore = new ContentViewCore(mContext, PRODUCT_VERSION);
         mViewAndroidDelegate = new AwViewAndroidDelegate(mContainerView,
                 mContentViewCore.getRenderCoordinates());
+        mViewRoot = ViewRoot.create(mWindowAndroid.getWindowAndroid());
         initializeContentViewCore(mContentViewCore, mContext, mViewAndroidDelegate,
                 mInternalAccessAdapter, webContents, new AwGestureStateListener(),
-                mContentViewClient, mWindowAndroid.getWindowAndroid());
+                mContentViewClient, mWindowAndroid.getWindowAndroid(), mViewRoot);
         nativeSetJavaPeers(mNativeAwContents, this, mWebContentsDelegate, mContentsClientBridge,
                 mIoThreadClient, mInterceptNavigationDelegate);
         mWebContents = mContentViewCore.getWebContents();
@@ -3209,7 +3211,7 @@ public class AwContents implements SmartClipProvider, PostMessageSender.PostMess
             // to enter fixedLayoutSize mode is sent before the first resize
             // update.
             mLayoutSizer.onSizeChanged(w, h, ow, oh);
-            getViewRoot().onPhysicalBackingSizeChanged(w, h);
+            mViewRoot.onPhysicalBackingSizeChanged(w, h);
             mContentViewCore.onSizeChanged(w, h, ow, oh);
             nativeOnSizeChanged(mNativeAwContents, w, h, ow, oh);
         }
@@ -3285,13 +3287,6 @@ 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() {
@@ -3395,5 +3390,4 @@ 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);
 }