Do not clear document background in Android WebView

android_webview/native/aw_settings.cc

Index: android_webview/native/aw_settings.cc
diff --git a/android_webview/native/aw_settings.cc b/android_webview/native/aw_settings.cc
index 5ee89b745d16f111bebaad2ac901bb265116eda0..0a1312d6ec34ecccc65a359548e3240994a0f3c2 100644
--- a/android_webview/native/aw_settings.cc
+++ b/android_webview/native/aw_settings.cc
@@ -177,6 +177,7 @@ void AwSettings::WebContentsDestroyed(content::WebContents* web_contents) {
 // static
 void AwSettings::PopulateFixedPreferences(WebPreferences* web_prefs) {
   web_prefs->shrinks_standalone_images_to_fit = false;
+  web_prefs->should_clear_document_background = false;
 }
 
 void AwSettings::PopulateWebPreferences(WebPreferences* web_prefs) {