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

third_party/WebKit/Source/core/frame/LocalFrame.cpp

Index: third_party/WebKit/Source/core/frame/LocalFrame.cpp
diff --git a/third_party/WebKit/Source/core/frame/LocalFrame.cpp b/third_party/WebKit/Source/core/frame/LocalFrame.cpp
index 429c13655b0cf65c691e469753ecbc0f954cd5cb..b11a12decbfe9bb60726160c3be46191c6e08ec3 100644
--- a/third_party/WebKit/Source/core/frame/LocalFrame.cpp
+++ b/third_party/WebKit/Source/core/frame/LocalFrame.cpp
@@ -285,7 +285,6 @@ void LocalFrame::setView(FrameView* view) {
 
 void LocalFrame::createView(const IntSize& viewportSize,
                             const Color& backgroundColor,
-                            bool transparent,
                             ScrollbarMode horizontalScrollbarMode,
                             bool horizontalLock,
                             ScrollbarMode verticalScrollbarMode,
@@ -315,7 +314,7 @@ void LocalFrame::createView(const IntSize& viewportSize,
 
   setView(frameView);
 
-  frameView->updateBackgroundRecursively(backgroundColor, transparent);
+  frameView->updateBaseBackgroundColorRecursively(backgroundColor);
 
   if (isLocalRoot)
     frameView->setParentVisible(true);