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

third_party/WebKit/Source/web/InspectorOverlay.cpp

 /*
  * Copyright (C) 2011 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 33 matching lines @@
 #include "core/frame/VisualViewport.h"
 #include "core/html/HTMLFrameOwnerElement.h"
 #include "core/input/EventHandler.h"
 #include "core/inspector/InspectorOverlayHost.h"
 #include "core/layout/api/LayoutViewItem.h"
 #include "core/loader/EmptyClients.h"
 #include "core/loader/FrameLoadRequest.h"
 #include "core/page/ChromeClient.h"
 #include "core/page/Page.h"
 #include "platform/ScriptForbiddenScope.h"
+#include "platform/graphics/Color.h"
 #include "platform/graphics/GraphicsContext.h"
 #include "platform/graphics/paint/CullRect.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebData.h"
 #include "v8/include/v8.h"
 #include "web/ChromeClientImpl.h"
 #include "web/PageOverlay.h"
 #include "web/WebInputEventConversion.h"
 #include "web/WebLocalFrameImpl.h"
 #include "wtf/AutoReset.h"
@@ skipping 480 matching lines @@
   // own graphics layers and attach them to the tree rather than going
   // through some non-composited paint function.
   overlaySettings.setAcceleratedCompositingEnabled(false);
 
   LocalFrame* frame =
       LocalFrame::create(&dummyLocalFrameClient, m_overlayPage, 0);
   frame->setView(FrameView::create(*frame));
   frame->init();
   FrameLoader& loader = frame->loader();
   frame->view()->setCanHaveScrollbars(false);
-  frame->view()->setTransparent(true);
+  frame->view()->setBaseBackgroundColor(Color::transparent);
 
   const WebData& overlayPageHTMLResource =
       Platform::current()->loadResource("InspectorOverlayPage.html");
   RefPtr<SharedBuffer> data = SharedBuffer::create(
       overlayPageHTMLResource.data(), overlayPageHTMLResource.size());
   loader.load(FrameLoadRequest(
       0, blankURL(), SubstituteData(data, "text/html", "UTF-8", KURL(),
                                     ForceSynchronousLoad)));
   v8::Isolate* isolate = toIsolate(frame);
   ScriptState* scriptState = ScriptState::forMainWorld(frame);
@@ skipping 238 matching lines @@
 bool InspectorOverlay::shouldSearchForNode() {
   return m_inspectMode != InspectorDOMAgent::NotSearching;
 }
 
 void InspectorOverlay::inspect(Node* node) {
   if (m_domAgent)
     m_domAgent->inspect(node);
 }
 
 }  // namespace blink