Introduce ViewRoot forwarding input/view events to native

chrome/android/java/src/org/chromium/chrome/browser/compositor/bottombar/OverlayPanelContent.java

Index: chrome/android/java/src/org/chromium/chrome/browser/compositor/bottombar/OverlayPanelContent.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/compositor/bottombar/OverlayPanelContent.java b/chrome/android/java/src/org/chromium/chrome/browser/compositor/bottombar/OverlayPanelContent.java
index f13b2897fcf7d36a2d6d0c40830118212f33780d..a9ac4f8e6380c50c97e92a5cefe26104c8f2c638 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/compositor/bottombar/OverlayPanelContent.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/compositor/bottombar/OverlayPanelContent.java
@@ -27,6 +27,7 @@ import org.chromium.content_public.browser.LoadUrlParams;
 import org.chromium.content_public.browser.WebContents;
 import org.chromium.content_public.browser.WebContentsObserver;
 import org.chromium.ui.base.ViewAndroidDelegate;
+import org.chromium.ui.base.ViewRoot;
 
 /**
  * Content container for an OverlayPanel. This class is responsible for the management of the
@@ -38,6 +39,9 @@ public class OverlayPanelContent {
     /** The ContentViewCore that this panel will display. */
     private ContentViewCore mContentViewCore;
 
+    /** The ViewRoot used to forward view/input events to native. */
+    private ViewRoot mViewRoot;
+
     /** The pointer to the native version of this class. */
     private long mNativeOverlayPanelContentPtr;
 
@@ -241,13 +245,14 @@ public class OverlayPanelContent {
         mContentViewCore = createContentViewCore(mActivity);
 
         ContentView cv = ContentView.createContentView(mActivity, mContentViewCore);
+        mViewRoot = ViewRoot.create(mActivity.getWindowAndroid());
         if (mContentViewWidth != 0 || mContentViewHeight != 0) {
             int width = mContentViewWidth == 0 ? ContentView.DEFAULT_MEASURE_SPEC
                     : MeasureSpec.makeMeasureSpec(mContentViewWidth, MeasureSpec.EXACTLY);
             int height = mContentViewHeight == 0 ? ContentView.DEFAULT_MEASURE_SPEC
                     : MeasureSpec.makeMeasureSpec(mContentViewHeight, MeasureSpec.EXACTLY);
             cv.setDesiredMeasureSpec(width, height);
-            mActivity.getCompositorViewHolder().setOverlayContentInfo(cv, width, height);
+            mActivity.getCompositorViewHolder().setOverlayContentInfo(cv, mViewRoot, width, height);
         }
 
         // Creates an initially hidden WebContents which gets shown when the panel is opened.
@@ -281,7 +286,7 @@ public class OverlayPanelContent {
                         return mContainerView;
                     }
                 }.init(cv);
-        mContentViewCore.initialize(delegate, cv, panelWebContents, mActivity.getWindowAndroid());
+        mContentViewCore.initialize(delegate, cv, panelWebContents, mViewRoot);
 
         // Transfers the ownership of the WebContents to the native OverlayPanelContent.
         nativeSetWebContents(mNativeOverlayPanelContentPtr, panelWebContents, mWebContentsDelegate);