[webview_flutter] Disable legacy Android video poster

packages/webview_flutter/webview_flutter/CHANGELOG.md

@@ -2,6 +2,7 @@
 
 * Updates minimum supported SDK version to Flutter 3.29/Dart 3.7.
 * Updates README to reflect that only Android API 24+ is supported.
+* Disables legacy Android video poster.
 
 ## 4.13.0
 

packages/webview_flutter/webview_flutter_android/android/src/main/java/io/flutter/plugins/webviewflutter/WebChromeClientProxyApi.java

@@ -4,6 +4,8 @@
 
 package io.flutter.plugins.webviewflutter;
 
+import android.graphics.Bitmap;
+import android.graphics.Bitmap.Config;
 import android.net.Uri;
 import android.os.Message;
 import android.view.View;
@@ -239,6 +241,16 @@ public boolean onJsPrompt(
   public static class SecureWebChromeClient extends WebChromeClient {
     @Nullable WebViewClient webViewClient;
 
+    /**
+     * Removes the gray Android player icon.
+     *
+     * <p>See https://issues.chromium.org/issues/40755557.
+     */
+    @Override
+    public Bitmap getDefaultVideoPoster() {
+      return Bitmap.createBitmap(1, 1, Config.ALPHA_8);
+    }
+
     @Override
     public boolean onCreateWindow(
         @NonNull final WebView view,

packages/webview_flutter/webview_flutter_android/android/src/test/java/io/flutter/plugins/webviewflutter/WebChromeClientTest.java

@@ -214,4 +214,14 @@ public void onJsPrompt() {
     verify(mockApi)
         .onJsPrompt(eq(instance), eq(webView), eq(url), eq(message), eq(defaultValue), any());
   }
+
+  @Test
+  public void getDefaultVideoPoster() {
+    final WebChromeClientProxyApi mockApi = mock(WebChromeClientProxyApi.class);
+    when(mockApi.getPigeonRegistrar()).thenReturn(new TestProxyApiRegistrar());
+
+    final WebChromeClientImpl instance = new WebChromeClientImpl(mockApi);
+
+    assertNotNull(instance.getDefaultVideoPoster());
+  }
 }