<webview>: Don't reset allowtransparency and allowscaling between createGuest and attachGuest

chrome/browser/apps/guest_view/web_view_browsertest.cc

Index: chrome/browser/apps/guest_view/web_view_browsertest.cc
diff --git a/chrome/browser/apps/guest_view/web_view_browsertest.cc b/chrome/browser/apps/guest_view/web_view_browsertest.cc
index 9b829079e1039160eab408c852991ef06c9f25ae..ca6aac230dfb0eab752827e10e46503d85885ad4 100644
--- a/chrome/browser/apps/guest_view/web_view_browsertest.cc
+++ b/chrome/browser/apps/guest_view/web_view_browsertest.cc
@@ -2737,3 +2737,15 @@ IN_PROC_BROWSER_TEST_F(WebViewTest, MAYBE_WebViewInBackgroundPage) {
   ASSERT_TRUE(RunExtensionTest("platform_apps/web_view/background"))
       << message_;
 }
+
+// This test verifies that the allowtransparency attribute properly propagates
+IN_PROC_BROWSER_TEST_F(WebViewTest, AllowTransparencyAndAllowScalingPropagate) {
+  LoadAppWithGuest("web_view/simple");
+
+  ASSERT_TRUE(!!GetGuestWebContents());
+  extensions::WebViewGuest* guest =
+      extensions::WebViewGuest::FromWebContents(GetGuestWebContents());
+  ASSERT_TRUE(guest->allow_transparency());
+  ASSERT_TRUE(guest->allow_scaling());
+}
+