[blink] Support (semi-)transparent background colors in WebView/Frame.

third_party/WebKit/Source/core/svg/graphics/SVGImage.cpp

 /*
  * Copyright (C) 2006 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 33 matching lines @@
 #include "core/svg/SVGDocumentExtensions.h"
 #include "core/svg/SVGFEImageElement.h"
 #include "core/svg/SVGImageElement.h"
 #include "core/svg/SVGSVGElement.h"
 #include "core/svg/animation/SMILTimeContainer.h"
 #include "core/svg/graphics/SVGImageChromeClient.h"
 #include "platform/EventDispatchForbiddenScope.h"
 #include "platform/LengthFunctions.h"
 #include "platform/ScriptForbiddenScope.h"
 #include "platform/geometry/IntRect.h"
+#include "platform/graphics/Color.h"
 #include "platform/graphics/GraphicsContext.h"
 #include "platform/graphics/ImageBuffer.h"
 #include "platform/graphics/ImageObserver.h"
 #include "platform/graphics/paint/ClipRecorder.h"
 #include "platform/graphics/paint/CullRect.h"
 #include "platform/graphics/paint/DrawingRecorder.h"
 #include "platform/graphics/paint/PaintRecord.h"
 #include "platform/graphics/paint/PaintRecordBuilder.h"
 #include "platform/instrumentation/tracing/TraceEvent.h"
 #include "wtf/PassRefPtr.h"
@@ skipping 617 matching lines @@
     }
 
     FrameLoader& loader = frame->loader();
     loader.forceSandboxFlags(SandboxAll);
 
     frame->view()->setScrollbarsSuppressed(true);
     // SVG Images will always synthesize a viewBox, if it's not available, and
     // thus never see scrollbars.
     frame->view()->setCanHaveScrollbars(false);
     // SVG Images are transparent.
-    frame->view()->setTransparent(true);
+    frame->view()->setBaseBackgroundColor(Color::transparent);
 
     m_page = page;
 
     TRACE_EVENT0("blink", "SVGImage::dataChanged::load");
     loader.load(FrameLoadRequest(
         0, blankURL(),
         SubstituteData(data(), AtomicString("image/svg+xml"),
                        AtomicString("UTF-8"), KURL(), ForceSynchronousLoad)));
 
     // Set the concrete object size before a container size is available.
     m_intrinsicSize = roundedIntSize(concreteObjectSize(FloatSize(
         LayoutReplaced::defaultWidth, LayoutReplaced::defaultHeight)));
   }
 
   return m_page ? SizeAvailable : SizeUnavailable;
 }
 
 String SVGImage::filenameExtension() const {
   return "svg";
 }
 
 }  // namespace blink