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

third_party/WebKit/Source/web/WebLocalFrameImpl.cpp

Index: third_party/WebKit/Source/web/WebLocalFrameImpl.cpp
diff --git a/third_party/WebKit/Source/web/WebLocalFrameImpl.cpp b/third_party/WebKit/Source/web/WebLocalFrameImpl.cpp
index 3ebeeceaf812cbefbdf05167d1eb918708a8860c..dee6f288bcc235b8e2caa9beccfe4dc5be5d03f3 100644
--- a/third_party/WebKit/Source/web/WebLocalFrameImpl.cpp
+++ b/third_party/WebKit/Source/web/WebLocalFrameImpl.cpp
@@ -166,6 +166,7 @@
 #include "platform/WebFrameScheduler.h"
 #include "platform/clipboard/ClipboardUtilities.h"
 #include "platform/fonts/FontCache.h"
+#include "platform/graphics/Color.h"
 #include "platform/graphics/GraphicsContext.h"
 #include "platform/graphics/GraphicsLayerClient.h"
 #include "platform/graphics/paint/ClipRecorder.h"
@@ -1726,12 +1727,12 @@ void WebLocalFrameImpl::createFrameView() {
   IntSize initialSize = (isMainFrame || !frameWidget())
                             ? webView->mainFrameSize()
                             : (IntSize)frameWidget()->size();
-  bool isTransparent = !isMainFrame && parent()->isWebRemoteFrame()
-                           ? true
-                           : webView->isTransparent();
+  Color baseBackgroundColor = webView->baseBackgroundColor();
+  if (!isMainFrame && parent()->isWebRemoteFrame()) {

[lfg, 2017/03/23 16:05:21]

nit: no need for {}

[Eric Seckler, 2017/03/23 16:34:49]

Done.

+    baseBackgroundColor = Color::transparent;
+  }
 
-  frame()->createView(initialSize, webView->baseBackgroundColor(),
-                      isTransparent);
+  frame()->createView(initialSize, webView->baseBackgroundColor());
   if (isMainFrame) {
     frame()->view()->setInitialViewportSize(
         webView->pageScaleConstraintsSet().initialViewportSize());