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

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

Index: third_party/WebKit/Source/core/svg/graphics/SVGImage.cpp
diff --git a/third_party/WebKit/Source/core/svg/graphics/SVGImage.cpp b/third_party/WebKit/Source/core/svg/graphics/SVGImage.cpp
index 064b9010b8c720d2e889a505fd3fa2f6b185da58..ec48a466fadf7b8620cef465d4ca1bae8bda0a6f 100644
--- a/third_party/WebKit/Source/core/svg/graphics/SVGImage.cpp
+++ b/third_party/WebKit/Source/core/svg/graphics/SVGImage.cpp
@@ -51,6 +51,7 @@
 #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"
@@ -688,7 +689,7 @@ Image::SizeAvailability SVGImage::dataChanged(bool allDataReceived) {
     // thus never see scrollbars.
     frame->view()->setCanHaveScrollbars(false);
     // SVG Images are transparent.
-    frame->view()->setTransparent(true);
+    frame->view()->setBaseBackgroundColor(Color::transparent);
 
     m_page = page;