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

third_party/WebKit/Source/web/tests/WebViewTest.cpp

 /*
  * Copyright (C) 2011, 2012 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
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                                    baseURL);
   // Expected: transparent on top of kTransparent will still be transparent.
   EXPECT_EQ(kTransparent, webView->backgroundColor());
 
   LocalFrame* frame = webView->mainFrameImpl()->frame();
   // The shutdown() calls are a hack to prevent this test
   // from violating invariants about frame state during navigation/detach.
   frame->document()->shutdown();
 
   // Creating a new frame view with the background color having 0 alpha.
-  frame->createView(IntSize(1024, 768), Color::transparent, true);
+  frame->createView(IntSize(1024, 768), Color::transparent);
   EXPECT_EQ(kTransparent, frame->view()->baseBackgroundColor());
   frame->view()->dispose();
 
   const Color transparentRed(100, 0, 0, 0);
-  frame->createView(IntSize(1024, 768), transparentRed, true);
+  frame->createView(IntSize(1024, 768), transparentRed);
   EXPECT_EQ(transparentRed, frame->view()->baseBackgroundColor());
   frame->view()->dispose();
 }
 
 TEST_P(WebViewTest, SetBaseBackgroundColorBeforeMainFrame) {
   const WebColor kBlue = 0xFF0000FF;
   FrameTestHelpers::TestWebViewClient webViewClient;
   WebViewImpl* webView =
       WebViewImpl::create(&webViewClient, WebPageVisibilityStateVisible);
   EXPECT_NE(kBlue, webView->backgroundColor());
@@ skipping 3974 matching lines @@
   EXPECT_FALSE(frameView->visualViewportSuppliesScrollbars());
   if (RuntimeEnabledFeatures::rootLayerScrollingEnabled()) {
     EXPECT_NE(nullptr,
               frameView->layoutViewportScrollableArea()->verticalScrollbar());
   } else {
     EXPECT_NE(nullptr, frameView->verticalScrollbar());
   }
 }
 
 }  // namespace blink