Sets a transparent background for out-of-process subframes.

third_party/WebKit/Source/web/WebLocalFrameImpl.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 1648 matching lines @@
 void WebLocalFrameImpl::createFrameView()
 {
     TRACE_EVENT0("blink", "WebLocalFrameImpl::createFrameView");
 
     ASSERT(frame()); // If frame() doesn't exist, we probably didn't init properly.
 
     WebViewImpl* webView = viewImpl();
 
     bool isMainFrame = !parent();
     IntSize initialSize = (isMainFrame || !frameWidget()) ? webView->mainFrameSize() : (IntSize)frameWidget()->size();
+    bool isTransparent = !isMainFrame && parent()->isWebRemoteFrame() ? true : webView->isTransparent();
 
-    frame()->createView(initialSize, webView->baseBackgroundColor(), webView->isTransparent());
+    frame()->createView(initialSize, webView->baseBackgroundColor(), isTransparent);
     if (webView->shouldAutoResize() && frame()->isLocalRoot())
         frame()->view()->enableAutoSizeMode(webView->minAutoSize(), webView->maxAutoSize());
 
     frame()->view()->setInputEventsTransformForEmulation(m_inputEventsOffsetForEmulation, m_inputEventsScaleFactorForEmulation);
     frame()->view()->setDisplayMode(webView->displayMode());
 }
 
 WebLocalFrameImpl* WebLocalFrameImpl::fromFrame(LocalFrame* frame)
 {
     if (!frame)
@@ skipping 503 matching lines @@
         return WebSandboxFlags::None;
     return static_cast<WebSandboxFlags>(frame()->loader().effectiveSandboxFlags());
 }
 
 void WebLocalFrameImpl::forceSandboxFlags(WebSandboxFlags flags)
 {
     frame()->loader().forceSandboxFlags(static_cast<SandboxFlags>(flags));
 }
 
 } // namespace blink