[WebView] Listen to window insets change

Overriding these methods in preparation for notch and safe area implementation
for WebView.

A corresponding implementation for Chrome app does this:
https://source.chromium.org/chromium/chromium/src/+/master:components/browser_ui/widget/android/java/src/org/chromium/components/browser_ui/widget/InsetObserverView.java;l=179;drc=b17e62321db0f69a9131d3bb87ab9cef502a0eaf?originalUrl=https:%2F%2Fcs.chromium.org%2F

An alternative would be to call View#setOnApplyWindowInsetsListener(),
but that might not be as straightforward and might conflict with app's own
usage around windowinsets.

Returning null from a default implementation and use super method until
we can actually implement it in the chromium repo.

(Note: I would like to merge this to R if possible.)

Bug: 159610496
Test: CL does not break build/test.
Change-Id: Ic0421d7347e8091e02af6c9d5a24fdb334f37c47

1 files changed, 16 insertions, 0 deletions

diff --git a/core/java/android/webkit/WebView.java b/core/java/android/webkit/WebView.java
index f9a713ac7fcc..1c75232dc15c 100644
--- a/core/java/android/webkit/WebView.java
+++ b/core/java/android/webkit/WebView.java
@@ -55,6 +55,7 @@ import android.view.ViewGroup;
 import android.view.ViewHierarchyEncoder;
 import android.view.ViewStructure;
 import android.view.ViewTreeObserver;
+import android.view.WindowInsets;
 import android.view.accessibility.AccessibilityEvent;
 import android.view.accessibility.AccessibilityNodeInfo;
 import android.view.accessibility.AccessibilityNodeProvider;
@@ -2449,6 +2450,14 @@ public class WebView extends AbsoluteLayout
             WebView.super.startActivityForResult(intent, requestCode);
         }
 
+        /**
+         * @see View#onApplyWindowInsets(WindowInsets)
+         */
+        @Nullable
+        public WindowInsets super_onApplyWindowInsets(@Nullable WindowInsets insets) {
+            return WebView.super.onApplyWindowInsets(insets);
+        }
+
         // ---- Access to non-public methods ----
         public void overScrollBy(int deltaX, int deltaY,
                 int scrollX, int scrollY,
@@ -3078,4 +3087,11 @@ public class WebView extends AbsoluteLayout
         encoder.addProperty("webview:url", mProvider.getUrl());
         encoder.addProperty("webview:originalUrl", mProvider.getOriginalUrl());
     }
+
+    @Override
+    public WindowInsets onApplyWindowInsets(WindowInsets insets) {
+        WindowInsets result = mProvider.getViewDelegate().onApplyWindowInsets(insets);
+        if (result == null) return super.onApplyWindowInsets(insets);
+        return result;
+    }
 }